” JJJJ JJJJJ JJJJJJJ IIIIIIIIIIIIIIIIIIIIII JJJ JJJJJJ JJJ JJJJ JJJ JJ JJ vIIIm”ml/””meII/IzI/IIIIIa[manual/luau”;mm mummy/mm,/WWI,”/W/xx,I,l/fl/flflmumaflmmWWI1ux”m””xx/”mummy”, IMPORTANT NOTICE o OPERATOR AND PASSENGER. This motorcycle is designed and constructed to carry the operator and one passenger. However, do not exceed the vehicle capacity load shown on the tire information label a ON Fuel Level. (page 21) 3 Front and Rear Brakes. (page 18, 59) 4. Wheels and Tires. (page 65) 5. Steering Operation. (page 72) 6, Front and Rear (page 72, 74) Suspension Units. . Lighting System. (page 12~14,79~83i . Battery Electrolyte. (page 75) . Drive Chain. (page 54) . Throttle Operation. (page 49) . Clutch Operation. (page 52) . Vlsually check the securlty of all controls, axles, suspension and steer- ing components. ISTARTING THE ENGINE oCold Engine Starting Procedure NOTE: The electrical system of the C375!) is designed to prevent electric starting it the transmission is in gear, unless the clutch is disengaged. However, it is rec— ommended that the transmission be placed in neutral before attempting to start the engine. 1. Turn the fuel tank valve to the “ON" position. 2. Insert the key into the ignition switch and turn to the “ON" position. At this time, observe the GREEN neutral Indi- cator lamp. The lamp will be on when the transmission is in the neutral position. Also at this time the RED oil pressure warning lamp should be on. If the lamp fails to come on,the connection should be checked for an open circuit and the bulb checked and replaced, i it has failed. 3. Make sure that the engine stop switch 25 is in the “RUN” position. 4t Raise the choke lever to the fully closed position. 5, Open the throttle slightly and press the starter switch button. It the engine does not start within 5 seconds, release the starter button and allow the starter motor to rest for approximately 10 seconds before pressing the starter button again. If the engine does not start readily with the electric starter, use the kick starter pedal to start the engine CAUTION: Do not allow the kick starter to snap back freely against the pedal stop as engine case damage could result If the engine fails to start after several repeated attempts, turn off the ignition switch and lower the choke lever to the fully open position, open the throt- tle fully and crank the engine using either the electric starter or the kick starter pedal. Turn the ignition switch 26 to the “ON” position and follow the starting procedure outlined in steps 1 through 5, however, at this time the choke is not necessary 6‘ After the engine starts, operate at ap- proximately 2,000 RPM until the engine will properly respond to the throttle when the choke is open. CAUTION: The oil pressure warning lighl should go off within a few seconds after the engine is started. If the light remains on, turn off the engine immediately and check the oil level. If lhe level is ade- quate, do not operate the motorcycle until the lubrication system has been examined by a qualified mechanic. oStarting in Extremely Cold Wealher Prime the engine before starting by crank- ing several times with the kick starter pedal. The ignition switch should be turned off. The choke should be fully closed and the throttle opened. Follow the procedure for COLD ENGINE STARTING. oWarm Engine Starting Procedure When the engine is to be re-started while it is still warm. proceed with the COLD ENGINE STARTING PROCEDURE, however the use of the choke IS not necessary. WARNING: Exhaust contains poisonous carbnn monoxide gas. Avoid inhala ‘ oi exhaust gases. Never run the eng e in a closed garage or confined area. IBREAK-IN PROCEDURE Continued excellence of performance and economy depend to a great degree upon the treatment and handling given during the first 600 miles of operation. It cannot be over-emphasized that the engine and motorcycle as a whole will benefit from a proper break-in. During this crucial period the motorcycle must not be driven at full power over extended distances, nor should it be driven too slowly. The general rules are as follows' 1, Maximum continuous engine speed during the first 600 miles must not exceed 5,000 rpm. 2. Increase the maximum continuous engine speed by 2,000er between odometer readings of 600 and 1,000 miles. Do not exceed 7,000 rpm. Vary speeds frequently, and use full throttle for short spurts only. 3. Never lug the engine with excessive throttle at low engine speeds. This 27 rule is applicable not only during break-in but at all times. 4. Upon reaching an odometer reading of 1,000 miles, you can subject the motorcycle to full throttle operation, however, do not exceed 8,000 rpm at any time (observe RED ZONE limit on tachometer). NOTE: Do not exceed 7,000 rpm when running the engine without a load. 28 IRIDING THE MOTORCYCLE WARNING: 1 Exhust pipes and mufflers become very hot during operation and remain sut- ficiently hot to inflict bums it touched, even after shutting off the engine. Wear clothing which will completely cover the legs while r mg and avoid any Contact with unshielded portions of the exhaust system. 2. Do not wear loose clothing which may catch on control levers, kick starter, foot pegs, drive chain, wheels and tires. 1, After the engine has been warmed up, the motorcycle is ready for riding. 2. While the engine is idling, pull in the clutch lever and press the gear change pedal to shift Into low gear (1st). WARNING: Ensure that the side stand is fullyl retracted before riding the motor- cycle. Failure to retract the stand may interfere with an attempted left turn and cause serious control problems. 3. Slowly release the clutch lever and at the same time gradually increase the engine speed by opening the throttle. Coordination of the throttle and clutch lever will assure a smooth, positive start. 4, when the motorcycle attains a moder- ate speed close the throttle, pull in the clutch lever and shift to 2nd gear by raising the gear change pedal. Release the clutch lever smoothly. 5. This sequence is repeated to progres- sively shift to 3rd, 4th and top gear (5th), CAUTION: 1. When changing gears, the clutch must be disengaged and the throttle momen- tarily closed to avoid overrevving the engine and over-stressing the drive train components. 2. To avoid battery discharge do not coast for a long distance with trans- mission in neutral. When decelerating the motorcycle, coordi- nation of the throttle and the front and rear brakes is most important. 1. The smooth gradual application of both the front and rear brakes together with the required throttle coordination will, under most conditions, assure positive speed reduction and stability. As the motorcycle speed is reduced, it is common practice to downshift the transmission progressively into the gear appropriate for the speed of the motor- cycle. This assures maximum control through better braking effectiveness and acceleration when necessary. 2. For maximum deceleration and brak‘ ing, simultaneously close the throttle, disengage the clutch and apply both the front and rear brakes, as the motor- cycle comes to a stop. This maneuver requires smooth coordination of the four controls and to maintain skill it should be practiced frequently. 29 Independent application of either the front or rear brakes is possible, but it only one brake is applied strongly enough to lock the respective wheel, braking effectiveness is greatly reduced and control of the motorcycle is with cult, CAUTION: Do not caasl tor a long di lance with the engine oft, and do not two the motorcycle 3 long distance, unless the drive chain is first removed. Even with gears in neulral, the transmis inn is properly luhricaled only when the engine is running. Inadequate lubricalion may damage the transmission. WARNING: 1. when rid g on wet roads or when riding in rainy condit ns, the frictional conlact between Ihe ires and the road is greally reduced, therefore exlreme caulion should be exercised during operation including braking, accelera- lion and turing. 2. when descending a sleep grade, down- shitt and use engine compression to- gelher with inlermiltent applicalions of both brakes to slow Ihe motorcycle downt Avoid continuous use of the brakes whi h may result in overheating and reduction oi braking ettieiency. CAUTION: The battery will charge when the engine speed is over moorpnc Do not allow the engine to idle tor long periods. when the battery is low. operate the motorcycle at engine speeds at above 2,000er for a while. IPARKING CAUTION: When parking the motorcycle. position the ignition switch lo the “on” position and remove the key. The steering should also he locked. Turn the fuel valve to the “OFF” posit no When parking at night near traiiic, theg tion switch can be posilioned lo the “PARKING” position and the key removed (page 12). This will Iurrl on the tai ght and make the molor- cycle more visible to traffic. ISAFE RIDING SUGGESTIONS ‘I. Always make a PRE-RIDING INSPEC- TION prior to riding your motorcycle (see page 24). . Never ride a motorcycle without a helmet and it is recommended that the motorcyclist wear boots, gloves, eye protection, and bright clothing to fur- ther enhance rider safety . Handlebar (airings and luggage racks or saddle bags may adversely affect the handling characteristics of the motor- cycle. Extra care must be taken in loading and riding motorcycles with this equipment Do not exceed the vehicle load limit shown on the tire information label. Place both hands on the handlebars and your feet on the foot rests while riding. Encourage a passenger to hold himself on the motorcycle with both hands and to use the passenger foot rests, 31 32 Obey all federal and local law regula< tions. Use the headlight anytime while riding to make the motorcycle more Visible to other motorists. It is recommended that you become iamiliar with your new HONDA C3750 by riding in an uncongested area be- fore riding on the public roadways. Be sure to signal when making a turn or changing lanes. t Do not ride on the roadway shoulder. Remember a motorcyclist should al- ways preserve nature and respect pro- perty. ILOADING AND ACCESSORIES WARNING: The addition of accessories and cargo to this motorcycle can create an unsafe condi'on by changing the motorcycle’s slab Iy, handling character- istics, and decreasing the safe operating speed. The factory cannot test each ac- cessory and all possible combinations to make specific recommendations. The operator must be personally responsible for his safety and the safety of others involved. Be aware that extreme care must be taken when selecling and install- irlg accessories, adding cargo, and rlding a motorcycle equipped with accessories and cargo. These general guidelines e given to aid the operator in decid 3 whether or how to equip his motorcycle. 1. Keep cargo weight concentrated low and close to the motorcycle to mini- mize the change in the motorcycle’s center of gravity. Distribute the weight equally on both sides of the machine. Total cargo weight should not exceed 60 pounds. . Luggage racks are primarily for light- weight items. Overloading the rack will adversely affect the handling. Bulky items located too far behind the rider will cause aerodynamic disturbance affecting stability, Luggage racks must not be mounted to the rear fender, . Visually check to determine that the accessory does not reduce the ground clearance or decrease the banking angle. r Make sure cargo is secure and will not shift while riding. Re-check security periodically. . Additional weight should not be at- tached to the handlebars or front forks because it increases the steering moment of inertia and can adversely affect the handling characteristics. 6. Accessories which modify the operator’s riding position may increase reaction time and affect handling. 7. Additional electrical equipment may overload the motorcycle’s electrical system causing an unsafe condition. a. large surfaces such as fairing, wind- shields, backrests, and luggage are sub- ject to aerodynamic forces which can adversely affect the handling. An improperly designed or improperly mounted fairing or windshield can create aerodynamic lift on the front of the machine. For the same size and shape, frame mounted fairings have less affect on the handling than do hand- leber or fork mounted fairings, Handlebar and fork mounted fairings are not recommended, IMAINTENANCE SCHEDULE The month and mileage intervals shown in the service schedule are intended as a guide for establishing regular maintenance and lubrication periods for your HONDA CB 750. Perform maintenance service ac cording to the indicated Intervals of months or miles whichever occurs first. For each service operation make reference to the respective page indicated in this MAINTENANCE SCHEDULE. Sustained severe or high speed operation under adverse conditions may necessitate more frequent servicing. To determine specific recommendations for conditions under which you use your motorcycle, consult your authorized HONDA Dealer. Especial- 34 Iy when your HONDA 03750 has been overturned or involved in a collision, have your HONDA dealer carefully in- spected the major components e.g. lrame, suspension and steering parts, for misalign- ment or damage to ensure further sale operation. CAUTION: To maintain the safety and reliability of your HONDA motorcycle do not modity the motorcycle and use only genuine HONDA parts or their equivalent when servicing or repairing. The use oi other replacement parts which are not at equivalent quality may impair the operation or your motorcycle. WARNING: To prevent personal injury, always make certain the engine is stopped and the motorcycle is supported securely on a level surface prior to performing any maintenance. REGULAR] SERVICE . - , INITIAL Performp aEtR eeery indi- Thls malntenance schedule ls based upon average ERVICE cmd momh or milb "ding mndifioni "mm” ageinterval, whichever Machines subjected to severe use, or ridden in un- occurs first. usually dusty areas, require more Irequenr servicing. 1 3 II 12 500 IMMI mall.- mm. ...In. miles m 1,500 3,000 6,000 .n... ma. am. ..u.. ENGINE OIL7 Change 0 o OIL FILTER ELEMENT7 Replace OIL FILTER SCREEN7Clean ' i "" O SgPARK PLucs7CIean and adjusl gap or replace if 0 necessary , , fi_ 'TNTACT POINTS AND IGNITION TIMING7 clean, . 0 check and adiust or replace it necessary fl # iVA’LVE TAPPET CLEARANCE7 Check, and adjusl iI . O necessary. . “CAM CHAIN TENSI0N7AdIusI. . I O ,7 ’PAPER AIR FILTER ELEMEN ean. mamammn, .r) ,0, PAPER AIR FILTER ELEMEN , place, (over-led indusly *CARBURETORs7check, and adjust; necessary, 0 I . O i 4THROTTLE OPERATION7Inspecz cables. . I 0 Check, and adjust Iree play. I FUEL FILTER SCREEN7CI'ean. Q FUEL’LINEs7check 70‘ 'CLUTCH7 Check operation, and adjust if necessary 0 DRIVE CHAIN— Check lubrlcale, and adjun if necessary. ”0 O 7 7, , BRAKE FlUID LEVEL—Check and add fluid rl necessary 0 fl 0 REGULAR SERVICE PERIOD INITIAL . . This maintenance schedule is based upon average SERVICE Eggr'ynggtf‘vw [Tide-- "d”! condmgns. ‘ _ PERIOD age in!ervai,whichever Machines subjecled to severe use, or rIdden In un- owns a,“ usually dusly areas, require more lrequem servicing. 1 3 s 12 500 .nnu. Ilnflll .ueura um. mile: 500 1,500 3.000 0.000 ...n.. .u... .u.. . .. ’BRAKE FLUD Rep|ace 7A monlhl or 12,099 miIeI ‘FRONT BRAKE PADS—Inspect, and replace ii worn i 'REAR BRAKE SHOES—Check wear indicator i BRAKE CONTROL LINKAGE—Check linkage, and ‘ adjusi Iree play if necessary. . twnm RIMS AND SPOKisicheck, Tignren spokes ‘ and true wheels, Ii necessary. _TIREs;Inspecr and check air pressure. i ”'7 FRONT FORK OIL—Drain and re FRONT AND REAR SUSPENSI Check operarion. ’ REA R F U R K BUS HI N CiGYeasc, check [qr excessive loosene§. ‘STEERING HEAD BEARI NGsiAdjust. "SIDE STANDicheck installation, operarion, defer» malion, damage and wear. >BATTERY7Check electrolyu level. and add waver II necessary; LIGHTING EQUIPMENT Check and adjust if necessary. 0" r PM N TS isons AND OTHER FASTENERS O ‘ —Chec|< security and righren I1 necessary. ‘ Iseeua named - .IreuId ae .emeed by an aurnorreed Head. deaIer. unIeee rne owner I... lamp" moh end r. meeaanieeny nmlimzn-nce item.- .re IInIpI: wpexlann end use -- marine sEEvIcE PERIOD an M". 36 yube niead by: new --- INITIAL SERVICE" PERIOD I m MILES IMAINTENANCE OPERATIONS oEngine Oil Level Check Because of the c3750 dry sump lubrica- tionsystem, a specific procedure must be followed for accurate oil level checks. 1. Start engine. if the oil pressure light does not go out, stop engine immedi- ately as severe engine damage may result. 2. Operate engine for approximately 10 minutes to stabilize level. Before the engine is warm, the level will appear too low, If the engine has just been operated at high RPMs, idle the engine at least 30 seconds before stopping the engine to prevent a low reading. 3. Stop the engine, place the motorcycle on the centerstand, and check the level with the dipstick. Oil level must be maintained between the upper @ and lower Cl) oil level marks on the dipstick. (page 39) 0 Engine Oil 1. Changing Oil and Oil Filter Element The engine oil isthe chief factor affecting the performance and the service life of the engine Therefore the oil recommen- dalions on page 23 should be observed and the oil always maintained at the proper level. The oil and the oil filter should be changed at the specified scheduls as shown on page 30. Draining the oil should be performed while ® oil tank drain ylul the engine is still warm as this will assure Perform the engine oil change in the fol- complete and rapid draining. lowing manner: a. Place an oil drain pan (1 gal.) under the oil tank to catch the oil. Remove the drain plug ® (page 37) with a 19 mm wrench and drain the oil. Place an- other oil drain pan under the crank- case, remove the crankcase drain plug (D with a 19 mm box wrench and drain the oil. Also remove the oil filter cover ® and the filter element, b. After draining the oil tank and the crankcase, operate the kick starter pedal several times to force out all residual oil remaining in the oil system passages. c. When the oil has been completely drained, reinstall the crankcase and oil tank drain plugs, making sure that the drain plug seals are in good condition, dv install the oil filter element and tighten the filter cover making sure the cover seal is in good condition At the 500 miles service remove and @Oil filter cover discard the original oil filter element 38 and install a new filter element. Thereafter, it is recommended that a new filter element be installed at every 3,000 miles or 6 months. Fill the oil tank with approximately 3 quarts of premium quality, SE, SAE 1oW—4ti oil. Start the engine and operate for several minutes. Stop the engine and check the oil level with the filler cap dipstick (e, @ Upper level mn'k ® Lower [mi mll'lt (D on unit G) Filler can dipstick CAUTION: (1) Do not operate the motorcycle it the oil level is below the lower oil level mark @ on the dipstick. (2) Do not overfillt Overfilling the tank will cause oil to be discharged out of the breather system, (3) when operating the motorcycle in un- usually dusty conditions. oil changes must be performed at more frequent intervals than that which is specified in the maintenance schedule. (4) If the motorcycle is going to be stored for an extended period, the oil should be changed r to storage. The oil Change interval for your HONDA engine is based on the use of oils that meet the requirements indicated in the section OIL RECOMMENDATION on page 23. Oil change intervals longer than those listed in the MAINTENANCE SCHEDULE will result in serious reductions in engine life and may affect HONDA obligation 39 under the provisions of the new motor- cycle guarantee. 2. Oil Pressure Check To determine the condition of the oil pump, it is recommended that an oil pressure check be performed during the 12 months or 6,000 miles service. As this check requires a special oil pressure gauge it should be done at your HONDA dealer. An inspection of the oil tank and all lines should also be performed at this time to ensure that there is no leakage. 3. cleaning Oil Pump Strainer The oil pump strainer is located under the oil pump inside the crankcase oil pan. Remove the crankcase oil pan by remov- ing ten retaining bolts to dismantle the oil pump strainer. Clean the pump strainer and sump pan thoroughly and re-install. This operation must be performed by a qualified mechanic and should be done during the 12 months or 12,000 miles service. 40 oSpark Plugs The NGK~DBESill or DENSO X-24ES spark plug is used as standard equipment on the CB750. For most riding conditions this spark plug heat range is satisfactory. However, if the motorcycle is going to be operated for extended periods at extremely high speeds and near maxi- mum power in hot climates, the spark plugs should be changed to a colder heat range. Servicing of the spark plug is as follows a. Detach the spark plug lead and re— move the spark plug with the special wrench provided in the tool kit. b. inspect the electrodes and center por- celain of the spark plug for deposits, eroded electrodes, or carbon fouling, If the spark plug deposits are heavy, or the electrodes appear to be eroded excessively, replace the spark plug with a new one. If the spark plug is carbon or wet fouled the plug can sometimes be cleaned with a spark plug cleaner. When the spark plug cleaner is not available use a stiff wire brush. . Adjust the spark plug gap (D to 0.6—0.7 mm (0r024-0.028inch). The gap can be measured with a thickness gauge. The adjustment is made by bending the negative (grounded) electrode (D Q) Spark plug [a]; @ Neg-five electrde d. When installing the spark plug, it should be first screwed in finger tight and then tightened with the wrench 1/2 to 3/4 turn. CAUTION: (1) spark plugs musl be securely lighl- ened. An improperly tightened plug can become very hot and possibly cause damage lo the engine. (2) Never use a spark plug wi a heal range that is not recommended {or Ihis molorcycle. (3) Do not altempl to dry or remove son! from the spark plug by burning Ihe tip. 4] olgnition Timing Adjustment Adjustment of both the contact breaker point gaps and ignition timing is required to establish correct ignition timing. 1. Conlacl Breaker Point Gap Adiustmeni a. Remove the point cover. b. Open contact points (9 with finger or small screw driver blade and examine for pittinga If pitted or burned, the points should be replaced and the con- densers checked. A gray discoloration is normal and can be removed with a point filer Filing should be done carefully. Clean the point contacts after filing with a clean piece of unwaxed paper such as a business card, or with a chemical point cleaner, 42 6) Conan breaker Point: (3 Contact bruker pine lockinl um- Rmate the crankshaft in the clockwise direction (see arrow) to find the point where each breaker point gap is at maximum and check using a feeler gauge. . The standard gap is D,3~0i4 mm (0.012- 0.016in.). . When adjustment is necessary, loosen the contact breaker plate locking screw 6) and move the contact breaker plate to achieve correct gap. When properly gapped, retighten locking screw e). (1) Index mark (I) H cylinder breaker unint- © "F" mrk © Contact breaker base plate (9 Cylinder trimmer (9 Base plate lockint urewn 2. ignition Timing Adjustmenl Do not perform this operation until poini gaps have been adjusted. a. Rotate the crankshaft in the clockwise (see arrow) direction and align the “F” timing mark ® (1-4 cylinder (D) to the timing index mark a). At this time Contact breaker points (9 should just start to open. To determine accurately the exact moment of point opening, a continuity light should be connected @ Cont-Int breaker right hue plate @ Riflit blue phte locking mm ® 2~s cylinder breaker point.- across the 1-4 cylinder breaker points ©. b. If breaker point opening moment is in- correct (too early or too late), adjust- ment is made by loosening the three base plate locking screws © and care» fully rotating the base plate 6) until the continuity light flickers. Tighten base plate locking screws. NOTE: Rotating the base plate clockwise will retard nition timing, counterclock- wise rotation will advance ign' 'on timing. Adhere to the “F” mark pas n as ad- vanced or retarded timing wtll cause engine damage. c. Connect a continuity light to 2-3 cylin- der breaker points 0. Next rotate the crankshait1w°i1/2turn) in the clockwise direction and align the “F” (2-3 cylinder) timing mark to the index mark ®. if when these marks come into perfect alignment, the con- tinuity light flickers or goes off, no adjustment is necessary. If point open- 44 ing moment is incorrect, adjustment is made in the same manner as mentioned in section b. by loosening the two (2-3 cylinder) right base plate locking screws and carefully shifting the plate ® until the continuity light flickers. Tighten base plate locking screws. d. Recheck the contact breaker point gaps and recheck the ignition liming with the continuity light. This static timing procedure is relatively accurate if done with care, however, for best results a strob timing light should be used as both the initial and advanced engine ignition timing can be checked. Your HONDA dealer has this equipment and can perform this operation tor you. CAUTION: This ignition liming adjustment procedure must he made with care as advanced or relatded timing may cause engine damage. For best results, consult your Honda Dealer. OValve Tappet Clearance Adjuslment Excessive valve clearance will cause lappet noise, and insufficient clearance will cause valve damage and low power, Therefore, the valve tappel clearance should be main- tained properlyt Perform the valve tappet clearance check at the specified intervals. NOTE: (1) The cylinders are numbered 14 start- ing from the lefl side when facing Index mark “T" mark ® 14 cylinder mark torward while sit [lg on Ihe motor cycle. (2) The check or adiuslmenl of the (ap- pel clearance should be performed while the engine is cold. The clear- ance may tend Io increase as the temperature rises. 3. Turn fuel Valve to the “OFF" position, remove both fuel lines from the fuel valve body, raise the seat and pull the rear fuel tank rubber mounting away from the rear tank mount. Raise the Fuler tulle mlf. Hole up 45 back of the fuel tank slightly and pull the tank back until it clears the forward tank mounts, Remove and set tank aside. . Remove the ignition breaker point cover and the eight tappet adiusting hole caps While slowly rotating the Crankshaft clockwise (see arrow), watch the #1 cylinder intake valve tappet. When this tappet goes down all the way and then starts to lift, you must then watch for the alignment of the index mark 6), the “T” mark ®. Check the 1-4 q/lin— der mark ®. In this position. the piston in #1 cylinder will be at T.D.c, (top dead center) of the compression stroke and the intake and exhaust valves in that cylinder should be fully closed. t Check the clearance of both valves by inserting the feeler gauge © be- tween the tappet adjusting screw © and the valve stem. if clearance is correct there will be slight drag or resistance as the gauge is inserted if clearance is too close or loose, adjustment Is necessary. The standard tappet clearance is In 0.05 mm (0,001 .) Ex 0.03 mm (“.003 J t . Adjustment is made by loosening the tappet screw lock nut to and turning the adjusting screw © until there is slight drag on the ieeler gauge (9. Hold the tappet adiusting screw in this position and tighten the lock nut ©. Recheck the clearance with the gauge. To check or adjust clearance of #4 cylinder valves, rotate the crankshaft clockwise one full turn (360°) and align the marks as in step c above, then follow steps d and e. . Valve tappet adjustment for 2-3 cylinder can be performed as in steps c through d, however, the 2-3 cylinder mark ® must show (not 1-4 mark) when the index mark 6) and “T” mark ® are "@ Index mrk ‘ @ M cylinder mark @ “1‘" mark aligned. The number 2 cylinder intake lappet should be watched (not 121). h. To check or adjust #3 cylinder tappets, rotate the crankshaft one full turn (360°) and align the marks (2) as in step g above then follow steps d and e. i. Install all tappet adjusting hole capsi do not overtighten. oCam Chain Adjustment A loose cam chain will Cause the valve timing to change, resulting in poor per- formance. It will also cause excessive engine noise. a. Adjustment is made by loosening the tensioner lock nut ® and lock bolt ® this Will automatically release the ten- sioner push bar applying the proper tension to the cam chain. b. After completing the adiustment, tighten the lock bolt ® and lock nut 6), NOTE: Do not apply addilional pressure on Ihe tension push bar t9 Loek run ® Tenlioner lock bolt 47 0 Air Cleaner Air cleaner element cleaning and/or re- placement depends on the motorcycle operating conditions. Your HONDA dealer can help you to determine the frequency of cleaning or replacing the element. a Remove lhe air cleaner lower case ® by loosening the Wing nuts (:3. b. Remove the air cleaner element (9 and clean it by tapping lightly to loosen dust. The remaining dust can be brushed from the outer element surface with a soft brush or blown away with compressed air from the inside of the element as shown in the illustration. c. If carburetor adjustment is to be made, the air cleaner upper Case ® is re- moved by loosening the four air cleaner hose Clamp screws @ and removing the mounting bolts. Push down and pull back on the upper case to remove from the carburetors d. When ready to install the air Cleaner, assemble in the reverse order steps c, b and a. 4B (D An- cleaner lower case @ Whig mu! (3 Air Cluner element (D An cleaner upper use @ Air denier hm clump .cm oThrotIle Cable Adjustment For sate, positive and consistent engine response, proper function of both throttle control grip and cables is imperative. Check for smooth operation of the throt- tle grip through the entire range from fully open to fully closed with the steering set to the extreme right and left steering positions. Inspect the physical condition of the throttle cable housing between the throt- tle grip and the carburetors for kinks, chafing, other damage or for improper routing. Replace any damaged parts or reroute if required. Recheck the cables for tension condition with the handlebar in the extreme right and left steering positions. 1. The standard throttle grip play is 2~4 mm (0.08~0.16in) measured at the throttle grip flange, This measurement is made from the throttle grip in the closed position to the point the engine 2‘ rpm starts to increase as the throttle- grip is twisted inward to (page 50), it adjustment is necessary, loosen the throttle grip adjuster lock nut ® and turn the throttle grip adjuster @. Tighten the lock nut after adjustment. Next, twist the throttle grip outward (3) until a resistance is felt and then measure the travel of the grip from the point of resistance to the lull stop position, This travel is called the ® Throttle grip adjuster lock nut @ Throttle grip adjunter @ Throttle Erlv “ overriding stroke” and should be 3.2~6.4 mm (1/B~1/4 in.). If the overriding stroke IS less than the standard specriied, have the adjustment performed by an authorized HONDA dealer. Throttle grip play Overridlng stroke (3 Engine rpm scam (n intruse tron. idling rpm (19 Point refinance i. (:11, © Throttle tun cloned volition 50 oCarburetor Adjustment NOTE: Before making adiuslments to the carburetor. be sure the ignition system is funcl‘mning properly and the engine has good compression. Do not attempt to compensate for other iaults by carburetor adjustment. The motorcycle equipped with the linkage type carburetor is adjusted in the follow- Ing mannerv 1. Start and warm up the englne for several minutest 2. Set the engine idle speed between 9011 a? , , m 14‘ (9 Stop wrew to 1,000er by adjusting the stop screw (D. Turning the stop screw in the ® direction will increase the rpm, and turning in the ® dlreclion will result in a decrease. at Alter pertorming the ad|ustment In sec- tion 1 and 2 above, if the proper idle speed cannot be obtained or if the exhaust back pressures from the cylin- ders are not uniform, have the carbu- retors readjusted by an authorized HONDA dealer. NOTE: Carburetor synchroniz ion re- quires Ihe use of special instruments and should be performed by an authorized Honda dealer. oFuel Valve Strainer The fuel strainer is incorporated in the fuel valve which is mounted on the bottom side of the fuel tank at the left side. Accumulation of dirt in the strainer will restrict the flow of the fuel and cause the carburetors to malfunction, therefore, the fuel strainer should be serviced periodi- cally by authorized HONDA dealers, 51 oCIutch Adjustment The clutch should be adjusted so that the application of the clutch lever will com- pletely disengage the transmission of power. if the clutch does not completely disengage, the engine will stall when shifte ing into gear or else the motorcycle will have the tendency to creep even with the clutch lever disengaged. However, it the clutch does not fully engage, the clutch will slip and the motor» cycle will not accelerate in response to the acceleration of the engine. In order for the full engine output to be delivered to the rear wheel, it is necessary to have the clutch properly adlusted. NOTE: The normal clutch lever tree play is measured 10~25 mm (0.4~1.IJ in.) at lever end before the clutch starts to disengage 52 To adjust, perform the following steps. 3. Screw the clutch cable adjusting bolt G), located at the clutch lever, all the way into ® the clutch lever bracket. b. Turn the clutch cable adjusting bolt (9, located at the clutch housing, in the direction ®to loosen the clutch cable. (9 Clutch cnble nun-tin: bolt :3) Lock mil c. Remove the clutch covert Loosen the clutch lifter adjusting screw lock nut ®, turn the clutch adjusting screw (D in the clockwise direction ® until a slight resistance is felt. From this position, turn the adjusting screw 6) in the counterclockwise direction ® 1/4~1/2 turn. Tighten the lock nut Q), . Turn the clutch cable adjusting bolt, located at the clutch housing side of engine, in the (9 direction so that there is approximately 3/4” of free play at the end of the clutch lever, then tighten lock nut (4). (D Clutch grunting scerw ® Adjusting mew lock nut e. The remaining clutch lever free play is obtained by the clutch cable adjusting bolt (1). After the adjustment has been made, check to see that the clutch is not slipping and that the clutch is properly disengaging, After the engine starts, pull in the clutch lever and shift into gear, and make sure that the engine does not stall, and the motorcycle does not creep. Gradu- ally release the clutch lever and open the throttle, the motorcycle should start smoothly and gradually accelerate. a... n. ® Clubch cable djusting bait (9 Lock nut uDrive Chain Inspection, Lubrication and Adjustment The service life of the drive chain is de- pendent upon proper lubrication and ad» justment. Proper maintenance will help to extend service life and ensure smooth power transmission to the rear wheel. Poor maintenance can cause premature wear or damage to the drive chain and sprockets. The drive chain must be checked, and serviced as necessary, after the first 200 miles of operation, and at least every 500 miles thereafter. If your C5750 is operated at sustained high speeds, or under conditions oi frequent rapid acce» leration, the drive chain must be serviced more often. Inspection Place the motorcycle on Its center stand, with transmission in neutral. Turn the rear wheel slowly, and inspect the drive chain and sprockets for any of 54 the following conditions DRIVE CHAIN - Damaged Rollers ~ Loose Pins -Dry or Rusted llnks ~ Kinked or Binding Links - Excessive Wear - Improper Adiustment SPROCKETS - Excessively Worn Teeth ABroken or Damaged Teeth Drive chain with damaged rollers or loose pins must be replaced. Chain which ap- pears dry, of shows signs of rust. requires supplemental lubrication. Kinked or bind- ing links should be thoroughly lubricated and worked free. If links cannot be freed the chain must be replaced. Measuring Drive Chain Wear Measure a section of drive chain to deter- mine whether the chain is worn beyond its service limit. Put the transmission in gear, then turn the rear wheel forward until the lower section of the chain is pulled taut. With the chain held taut, and any stiff joints straightened measure the distance between a span of 20 pins, from pin center to pin center. In a new ca 750 drive chain, this distance will measure 111/lll'l. (each pitch:5/8in.). If the distance exceeds 12‘/.in. the chain is worn out and must be replaced. After the chain is measured, shift the transmission into neutral again before proceeding with in- spection and service. Measuring Drive Chain Tension Check drive chain tension at a point mid- way between the drive sprocket and the rear wheel sprocket. Move the chain up and down with your fingers, and measure the amount of slack, Drive chain tension is adjusted to 1/2—1in, Slack becomes greater as the chain wears. If chain slack is found to exceed the above limit, the drive chain must be readjusted, Drive chain tension should remain fairly constant as the wheel is turned. If slack increases or decreases markedly in certain sections of the chain, this indicates that Measuln a Span or 20 pins (19 pitches). meiwzwreoimxmxwrwrem Service Limit: lZ'Ain. 55 some of the links are either kinked or have worn pins. CAUTION: Excessive chain slack may cause crankcase damage. Inspecting the Sprocket Inspect the drive sprocket and rear wheel sprocket for damage or wear. The left rear crankcase cover must be removed for access to the drive sprocket. Excessively worn sprocket teeth have a hooked and asymmetric appearance. Replace any sprocket which Is damaged or excessively worn. Damaged Sprocket Tutti Worn Spruckel Teeth Narmal Smack" Teeth O 56 Recommended Sprocket Sizes Drive Sprocket l Driven Sprocket (engine) ‘ (rear wheel) iseTaoth l 46-Tooth NOT Never Install a new drive chain on badly worn sprockets. or use new sprockets with a badly worn drive chain. Both chain and sprockets must be in good condition, or the new replacement chain or sprocket will wear rapidly. Adjustment Drive chain slack should be checked and adjusted as necessary. After the first 200 miles of operation and at least every 500 miles thereafter. CB 750 motorcycles operated at sustained high speeds, or under Condltlons oi irequent rapid ac- celeration, may require more frequent adjustment. The procedure for drive chain adjustment is as follows. 1. Place the motorcycle on its center stand, with transmission in neutral. 2. Remove cotter pin from the rear axle nut and loosen the Hut. 3. Loosen lock nuts on both adjusting bolts. 4. Turn both adjusting bolts an equal number of turns until the correct drive chain tension is obtained. Turn adjus- ting bolts clockwise to tighten the chain, or counterclockwise to provide more slackt Adjust to provlde approximately 1/2—1 inch of chain slack at a point midway between the drive sprocket and the rear wheel sprocket. Rotate the rear wheel and recheck tension at other sections of the chain. 5. Check rear axle alignment with the index marks on the rear swinging arm. Both left and right marks should corre- spond. if the axle is misaligned, turn the left or right adjusting bolt until marks correspond on both sides of the rear swinging arm, and recheck chain tension. 6. Tighten both adjusting bolt lock nuts. 7. Tighten the axle nut and install a new cotter pin. 8. Check rear brake pedal tree travel. When the rear wheel is repositioned to adjust drive chain slack, brake pedal free travel is also affected. Refer to page 64 for brake adjustment instruc- lions. Drive chain lubrication Lubricate the drive chain with a high quality chain lubricant after the first 1,500 miles and then at 300 miles intervals. Lubricate the drive chain earlier if it ap— pears dry, More frequent inspection and servicing is required under severe operating condi- tions. 53 1. The CB 750 is equipped with an endless type drive chain and requires periodic inspection. If dirty or rusted, clean with brush and solvent, wipe and dry with a clean rag. Inspect the chain or wear (slopoy joints), stiffness and bind- ing at the joints, and broken or sepa- rated rollers. Apply a liberal amount of high quality chain lubricant. If damaged or worn, the chain should be replaced. Replacement of the end- less chain requires a special tool, therefore your Honda dealer should be consulted Use RKSOSS chain only. 2. Adjust drive chain as described in steps “1~3", page 56~57 oBrake Inspection and Adjustment Brakes are items of personal safety and should always be maintained in proper adjustment. 1. Front Brake The CB 750 front brake ls a hydraulically operated caliper/disc type. This type brake will provide reliable operation and excellent braking qualities at much higher operating temperatures than the drum type brake. when the brake lever is applied, brake fluid transmits the pressure to the brake piston in the caliper, pressing the friction pads against the disc. Brake fluid is a medium for transmitting pressure and plays a vital roll in the brake system, Therefore when scheduled brake mainten- ance is performed, it is imperative that the front brake system is inspected to in- sure that there is no fluid leakage. As the friction pads wear, additional fluid is taken into the system from the fluid reservolr to compensate for the friction pad wear. Because of this feature, the disc brake is self adiusting and the brake control lever free travel will remain con- stant once the free travel has been estab- lished and providing the hydraulic system is free of air. If the control lever free travel becomes excessive and the friction pads are not worn beyond the recommended limit (page 58), there is probably air in the brake system and it must be bled. 2. Brake Fluid WARNING: Brake fluid may be harmful if swallowed. May cause irritation, avoid Contact with skin or eyes. If swallowed, induce vomiting by giving an emetic such as two tahlespoonfuls of table salt in a glass of warm water and call a physician. In case of contact with skin or eyes, flush with plenty of water. Get medical atten- tion for eyes. KEEP OUT OF THE REACH OF CHILDREN. 59 The brake fluid level in the reservoir must be checked at regular intervals as in the MAINTENANCE SCHEDULE (page 36) and refilled whenever the level is lower than the level mark (9 engraved inside the reservoir. Clean the reservoir cap (2, re- move the reservoir cap (2, and diaphragm ® and fill the reservoir to the level mark. Use only brake fluid which is designated "DOT 3” on the Container. “DOT 3” brake fluid meets the SAE11703 specifi- @ Bieeder hm 60 cation. Outside the U,S.A., Use SAE H703 brake fluid. Reinstall the diaphragm and tighten the reservoir cap securely. CAUTION: Before removing the reser- voir cap always clean around it. 3. Bleeding the Brake System The brakes must be bled subsequent to work performed on the brake system, when the lever becomes soft or spongy or when lever travel is excessive. This procedure is best performed by two 2 ® Ruervniz cup (9 Dilnhnrm @ Level lhle mechanics. a, Remove the dust cap from the bleeder valve and attach bleeder hose (Di b. Place the free end of the bleeder hose into a glass container which has some hydraulic brake fluid in it so that the end of the hose can be submerged. c. Fill the reservoir with only the recom- mended brake fluid. Screw the cap partially on the reservoir to prevent entry of dust. :1. Pump the brake lever rapidly several times until pressure can be felt. Hold- ing the lever tight, open the bleeder valve one half turn and squeeze the lever all the way down. Do not re- lease the lever until the bleeder valve has been closed again. Repeat this procedure until bubbles cease to appear in the fluid at the end of the hose. e. Remove the bleeder hose, tighten the hleeder valve and install the bleeder g. a: valve dust cap. Do not allow the fluid reservoir to become empty during the bleeding operation as this will allow air to enter the system again. Refill the fluid as often as necessary while bleeding. Check for leaks in the front brake lines while holding pressure against the brake lever. Refill fluid in the reservoir when bleede ing is completed. Reinstall the dia- phragm and reservoir cap and tighten. After the hydraulic brake system has been drained follow the procedure outlined below: Fill the fluid reservoir. . Open the bleeder valve by one hall turn, squeeze the brake lever, close the valve and release the brake lever. This procedure must be repeated in this sequence until hydraulic fluid begins to llow through the bleeder hose. After filling the hydraulic system with 6| fluid, proceed with the actual bleeding operation. CAUTION: 1. Use only D01 a brake fluid from a sealed container. 2. Do not mix brake fluid brands and never re-use the contaminated fluid which has been pumped out during brake bleeding, because this will Im- pair the efficiency of the brake system. 3. Brake flu'd must he handled with care because it will damage paint and in- strument lenses. 62 4. Brake Caliper Adjustment Whenever the brake pads are replaced, the brake caliper (D must be adjusted. This adjustment is made in the following manner: a. Raise the front wheel off the ground by placing a support under the engine. b. Loosen the caliper stopper bolt lock nut O. c. Using a suitable screw driver, turn the stopper© bolt in direction (3 until the friction pad contacts the brake disc. when the wheel is rotated, some resis- tance should be noticed. :1. While rotating the front wheel. turn the stopper bolt in direction ® until the lront wheel rotates freely. e. Turn the stopper bolt in direction ® 1/2 turn further and tighten the lock nuts (3 Brake pad: (9 Slower bolt 5. Brake Pads Brake pad wear will depend upon the severity of usage, type of driving and condition of lhe raods. It may be expecled that the pads will wear faster on dirty and wet roads. Visually inspect the pads during all regular service intervals to determine the pad wear. if lhe pad wears lo the red line @, replace both pads with a new set NOTE: Use only HONDA genuine replace- ment ri-icliun pads offered by authorized HONDA dealers. When service is necessary on the brakes, consult your HONDA dealer. ® Red line 63 6. Rear Brake Adjustment The rear brake is an internally expand- ing type To check the rear brake pedal ® for tree travel, raise the rear wheel off the ground by supporting the motorcycle with the main stand. Then hand-rotate the wheel, measuring the distance the pedal can move before the brake is applied. Normal free travel is approx 25 mm (1 in.) as measured at the tip of the pedal. If readjustment is necessary, turn the adjust- ® Reu- brake pedll 64 ® stop bolt ing nut (3. Turning the nut clockwise will increase the free travel, and vice versa The stop bolt © is provided to make adjustment of the pedal height before the adjustment by the nut. To turn this bolt, loosen the lock nuts Upon adjusting, tighten the lock nut. ® Item- krnke mint-tin: nut @ Rear brake panel (9 Reference mark (g Arrow mark ® Rent bnke Irm 1. Rear Brake Wear Indicator When the rear brake is applied, a red arrow (5), adjacent to the rear brake arm (D, moves toward a red reference mark G) on the rear brake panel ©, The distance between the arrow and the reference mark, on full application of the rear brake, in- dicates brake lining thickness. If the arrow aligns with the reference mark on full application of the rear brake, the brake shoes should be removed and in- spected for wear. NOTE: When brake service is necessary, see your authorized Honda dealer, who has been properly Irained to perform such service. Use only high quality genuine Honda Paris. oWheel Removal and inspection 1. Front Wheel Removal Removal of the front wheel is performed in the following manner. a. Raise the front wheel off the ground by placing a support under the engine‘ be Remove the speedometer cable Q from the front wheel hub assemblys c. Remove the axle holder fixing nuts (2 and the front wheel assembly can be removed from the front fork i , ‘ \ i , @ Speedometer cable ® Axle holder fixilir run 65 To install the front wheel, reverse the sequence outlined above. NOTE: Do not depress the brake lever when the wheel is off the motorcycle as this can cause the caliper piston to be forced out of the cylinderwith subsequent loss of brake fluid. If this does occur servicing of the brake system will be necessary. WARNING: 1. When installing the caliper, fit the brake disc between the brake pads carefully. 2. Install the axle holder with the “F" arrow forward and tighten the forward holder nuts first to the specified torque, then tighten the rear nuts to the same torque. 3. After installing the wheel, apply the brake several times and then check if the wheel rotates freely. Recheck the wheel if the brake drags or wheel does not rotate freely. Torque for axle holder: 1.B~2.5 kg-m (13~1fl Ibs-ftl 66 2. Rear Wheel Removal Removal of rear wheel is performed in the following manner, a. Place the motorcycle on the main stand. b Remove the rear brake adjusting nut to and actuating rod from the brake arm ®. (2. Remove rear brake plate torque arm lockpin O, nut Q), washer ®, and bolt 6). d. Remove the cotter pin from the right side of the rear axle and loosen the Nut 6) Rear brake adiuxtinl ml! ® ® Bnke nun G) Washer ® Lock pin G) Bolt axle nut @, Loosen the rear wheel adjusting bolt lock nuts 0, back out the adjuster bolts ® and turn the chain adjusters downward. Remove the cap fixing bolts 69 and end caps. f, Push the wheel forward, lift the chain off the sprocket, then pull the wheel rearward, clear of the rear forkr install the rear wheel, reverse the a: To seq uence outlined above @ Axle nut @ Lnek nut 60 Adjuster bolt a3 Fixing he]: Adjust the rear brake following drive chain adjustment. CAUTION: Alwars use new colter pin when reassembling‘ 3. Wheel Inspection At any time the front or rear wheel is removed, take the opportunity to throughly inspect the suspension components, brake friction linings and wheel bearings In- spect the condition of wheel rim and spoke tension at regular intervals as in the MAINTENANCE SCHEDULE (page 36). it is recommended that retightening of spokes be done by a qualified mechanic, 67 eTire lnformalion Correct air pressure will provide maxi- mum saiety, stability, riding comfort and tire life, Be sure to follow the tire specification Up to 200|b Front 23 (20) Cold tire lload m lZK pressures ‘i 77 7 4 psi (kg/m2) Un in vehicle M (225) capaclly load Re, 4075) m 7/ capacity load 360|bs (1631(3) limit 1' .1 .zsma "3 5' e 4.0mm ridgesmne SZ’IFZ . Dunlap rs T'” m” Rear: Bridgestone 521RZ ‘ Dunlap K87 Mark ll stability and handling. ~ Improper inflation of the Iires will cause abnormal Iread wear or o(her damage and create a saiely hazard. Riding wilh underinflaled tires will cause [he Iires lo slip an the rims dama g the inner lube valves. Severe underlnllalion may result in loss of (he lire from the rim. ~ Check tire pressures frequenlly and ad- just if necessary. -II I: recommended that Ihe (ires be replaced when Ilie tread dep|h at the center of Ihe tire is less than the fol- lowing ' it. Minimum recommend iire center tread depth ll1sin. (1.5mm) 3/32ina (2.0 mml Fro Rear: WARNING: ~The use or tires oiher ihan ihose re- commended may resnll in decreased 65 ~0peralion wilh excessively worn iires is very hazardous and will adversely affect iraeiicm, sleering and handling. the damage Replace damaged tires, Do not patch or vulcanlze a tire casing. We recommend that punctured inner tubes tubes be replaced. Inner tubes should be patched only in emergency situations when replacement tubes are not available. If replacing an inner tube, be certain to select the correct size for the tire casing. Be certain to locate and eliminate the cause of damage before reassembling the tire and tube on the wheel. WARNING: Patching may adversely afiect wheel balance. Also, a poorly bonded patch may cause subsequent lire deflation. a. Remove the wheel assembly to be worked on as described in Front or Rear Wheel Removal pages 65 or 67. b. Remove brake plate assembly and/or axle, so wheel can be layed flat. Lay wheel assembly on a rag or cardboard tb prevent hub surrace damage, c. Remove valve core and valve stem retaining nuts. Locate and remove any sharp object if the cause of puncture. . Step down on tire to break itrreerrom the rim. Repeat on the opposite side. Using two small or medium size irons, placed Min. apart and inserted be- tween the rim edge and tire bead at the valve stem location, pry in and downward with both tire irons while depressing the tire bead opposite the tire irons, with your foot. when tire bead is above the rim edge remove one tire iron and move it 3—4in. further away from the tire iron support- ing the tire bead and insert and pry the tire bead further off of the rim. Proceed in this manner until the entire side of the tire casing is above and clear of the rim edge. The deflated inner tube can now be pulled from the tire casing and the inner tire casing inspected for damage or protruding sharp object etc. Locate and eliminate cause of flat or puncture. Install a new inner tube of the correct size by inflating very slightly. Leave the valve core in the valve stem. 69 70 . Inspect the wheel rim strip inner tube protector to see that it is in good condition and centered over the spoke nipples in the rim recess. Align the tire balance mark wuh the valve stem hole in the rim and insert the partially inflated inner tube into the tire casing. Work the inner tube into proper posi» tion in the tire casing and insert the valve stem through the valve stem hole in the rim. Install a valve stem retain- ing nut partially, but not tightly, onto the valve stem. Remove valve Core. . Apply a light coating of tire mounting solution (liquid detergent can be used in an emergency) to each of lhe tire bead surfaces, and between the free tire bead and rim edge. The tire can now be stepped into place using your heels. Placing both heels on the tire bead opposite the valve core and depressing the tire bead into place a slight amount with each step in op- posite directions around the wheel. . When 80—90% of the tire bead in place, use a tire mounting mallet (heavy rubber, leather or plastic hammer) to force the remaining section into posi- tion. Avoid using tire irons or screw drivers for this operation as inner tube punctures will result. rl. Insert the valve core and overinflate the standard pressure by approximately 10psi (0.7kg/cm’). This will help to properly seat the tire beads onto the rim. Inspect for proper tire bead seat- ing and deflate the tire. Reinflate to the correct specified pressure (see page 63) and tighten the valve stem retain- ing nut lightly. o, Kecheck the tire pressure and install the valve stem cap. p. Install wheel assembly as per instruc- tions on page 55~s7. Wheel Balance During high speed riding, the balance of the wheel will have Considerable effect on the steering stability, therefore, the balance should be checked periodically. WARNING: theel balance can affect the safety, stability, and handling of this motor- cycle. When wheel balancing is neces- sary, see your authoriled Honda motorcycle dealer. ~When removing lhe tire from the rim for repair or lire change, the tire balance mark (yellow) and the valve stem should be in alignment. Removing the balance weight or relo- cating it to a difiereni spoke nipple will affect the wheel balance. Mainlenance of spoke lension and wheel trueness are c cal to safe motorcycle operation. During lhe first 500 miles, spokes will loosen more rapidly due to initial sealing of parts. Excessively loose spokes may result in high speed in~ stability and possible loss of control. WARNING: Remember when repairing a flat or installing a new 1) Always locate and el inatethe cause of the tire failure to avoid subsequent failure. 2) Never aliempl lo palch or vulcani e a tire casing as this weakens the ca mg and may result In a blowout. 3) An innertube should be palched only emergency situations. A patched lnnertuhe is not as reliable as a new lube. 4) The innertube size must correspond with the tire casing size or it will cause the tube to wrinkle or to be stretched beyond its designed capacity. In either case the innertube will be weakened increasing the possibility of failure. The use of tires other than those listed on the tire information label may adversely affect handling. rire servicing and replacement require skill and special tools. In as much as the safety of the rid r is dependent upon the good condition of the tires and wheel assemblies, we urge you to have this service performed by your authorized Honda Dealer. 5 6 7| oFronl Suspension 1. Front Suspension Inspection Check the front fork assembly by locking lhe front brake and pumping the fork up and down vigorously. Suspension action should be smooth and there must be no oil seepage. Carefully inspect all front suspension fasteners for tightness. This includes the attachment points of the fork tubes, brake components and handlebar. WARNING: If any suspension compo- nents appear worn or damaged, consult your Honda dealer forfurlher inspection. The suspension components are directly safely related and your Honda dealer is qualified to determine whether or not replacement parts or repairs are needed. 72 2. Front Fork oil Change To maintain good riding characteristics and increase fork service life, the oil in the front fork should be changed peri- odically. a. Unscrew the front fork drain plug Q at the bottom of fork cylinder, drain the oil by pumping the fork while plug is out. Replace the plug securely after draining. (D Front i‘ork dnin plug . Set the motorcycle on the center stand. Place a jack under the crankcase to control lowering of the front end . Remove the handlebar by removing the four handlebar bolts .. Unscrew the top tiller plugs ® until free. . Lower the iack under the engine to extend the fork springs with the at- tached filler plugs. . Move the fork springs to one side and pour 4.9015. (145cc) of premium ® Top tiller plux 0) Handlebar bnlu quality ATF (automatic transmission fluid) into each fork leg. . Raise the jack under the engine to al- low the fork springs and filler plugs to return into the fork legs. . Securely tighten the top filler plugs ®. '. Reinstall handlebar, tightening the two front bolts first, then securely tighten- ing the two rear bolts. . Remove the jack from under the en- gine. 73 0 Rear Suspension 1. Rear Suspension Inspection Check the rear suspension periodically by careful visual examination. Note the fol- lowing items: 3, Rear fork bushing—This can be che- cked by pushing hard against the side of the rear wheel while the motorcycle is on the main stand and feeling for looseness of the fork bushings. b. Check side stand installation for ease of operation and damage, side stand spring for damage and loss of tenslon, and side stand rubber for wear, c. Check all suspension component at- tachment points for security of their respective fasteners WARNING: 1. If any suspension components appear worn or damaged, consult your Honda dealer tor further inspetion. 2. The rear suspension units on the C3750 are sealed at the factory and 74 do not require scryicing. Neyer at- tempt to destroy the seal or disas- semble the rear suspension damper units. 2. Rear Fork Bushing Lubrication There is a lubrication point (D as shown in the figure It is recommended that lubrication be performed every 6 months or 3,000 miles whichever comes first, with multipurpose Type NLGI No. 2. 3. Rear Cushion Adjustment The rear suspension (D has five-ranges of adjustment and can be adjusted to meet the different types oi road or riding con- ditions. Position “l" is (or normal riding with the damper spring strength increasing progressively for H to v. Position “v“ is to be used for heavily loaded conditions or when operating on bad roads. oBattery If the motorcycle is operated with an insufficient (low) battery electrolyte level, sulfation and battery plate damage may occur. inspecting and maintaining the electrolyte level is a simple, quick opera- tion, therefore, it should be performed frequently as indicated in the MAINTE- NANCE SCHEDULE (page 36) and PRE- RIDING lNSPECTION (page 24). 1. Battery Electrolyte a. For battery (12 V-14AH) (D inspection and service access, remove the left cover by pulling tree of the rubber mounts and by raising the seat. The electrolyte level can be seen from the left side at the motorcycle without removing the battery. The correct el— ectrolyte level is between the “LOWER” ©and “UPPER ”6) level marks on the battery case. b. To correct the electrolyte level, remove the battery cell caps from the cells needing level correction. In case at 75 (9 Hanan (9 Left cover 76 cell level correction a small syringe or plastic tunnel should be used. Carefully add the proper amount of distilled water to bring the electrolyte level of the cells between the “LOWER” © and “UPPER” 6) marks. For maximum bah tery performance and life only distilled water should be added, however, in an emergency situation where electrolyte level is lound to be low and distilled water is not available, drinking water or a low mineral content can be used. Reinstall the cell caps. @ Utmr level mark @ Lower level mark WARNING: Charge ill battery in a well- ventilated area. Remove the tiller caps and make sure the charger is connected properly to the battery before changing CAUTION: Use only distilled water in the battery. Tap water will shorten the service life of the battery. Consult your Honda dealer it you are experiencing an excessively high rate of battery electrolyte loss. 2. Battery Removal and lnstllation Battery removal may be necessary when battery electrolyte specific gravity read- ing is below 1.200, indicating the need of battery recharging. WARNING: The battery contains sulfuric acid. Avoid contact with skin. eyes or clothing. Antidote: EXTERNAL-Flush with water. INTERNAL-Drink large quantities water or mlik. Follow with milk of mag- nesia, beaten egg or vegetable oil. Call physician immediately. Eyes: Flush with water and get prompt medical attention. Batteries produce explosive gases. Keep sparks, tlame, cigarettes away. Ventilate when charging or using in enclosed space. Always shield eyes when working near batteries. KEEP OUT OF REACH OF CHILDREN. a. Remove battery retainer and disconnect the ground (7| negative cable connec- tion first and the positive l+l cable last. The battery can now be lifted from its mounting. Note the positioning of the cables, protective rubber (+i terminal cover and battery mount rubber pads as well as the routing of the battery vent tube. Before installing the battery, clean the battery and its mounting area with water. Baking soda and water can be used to remove any exsisting Corrosion. b. Battery installation is performed in the reverse order of removal. Pay par- ticular attention to the battery rubber mounts pads and the vent tube routing. Install the battery vent tube as illus- trated. Connect and protect the posi- tive H») terminal with the rubber in» sulator first. Connect the negative(—) terminal second. WARNING: Check thetuel tank over flow tube tor clogging, bending and cracking. CAUTION: 1. Do not overlighlen these terminal connections as damage to the battery terminals may result. 2. When installing the battery, route the battery breather tube as shown in the figure and be caretul not In bend or twist the breather tube. A bent or kinked breather tube may pressurize the battery and damage its case. NOTE: Apply petroleum jelly to the bat- lery terminals to retard corrosion. 3. Battery Charging Should the battery electrolyte specific gravity reading (measured with a hydro- meterl drop below 1.200@68°F or 20°C, the battery should be charged at a rate not to exceed 1.5 amps until the speci- fic gravity reading is between 1.250 and 1.280 @ 5W or 20°C. Repetition ofa discharged or partially discharged battery condition is sometimes the re- sult or improper starting procedure, poor engine condition and/or electrical system problems. To locate and cor- rect the cause of this condition, we sug- gest you contact your HONDA dealer. When storing the motorcycle or when it is not being used for an extended period, the battery negative (—) cable should be disconnected or the battery removed and stored in a cool place. The battery should be charged at least once a month during the storage period to preserve the battery life. WARNING: Charge the batter in a well- ventilated area. Remove the iller caps and make sure the charger is connected properly to the battery hetore charging. 7B a Fuse Replacement The fuse holder is located behind the left side cover. The recommended fuses for the CB 750 are 15 A, 7A and 5A. When frequent failure of the fuse occurs, it usually indicates a short circuit or on overload in the electrical system. in this case the electrical system should be check- ed visually for shorts or other possible malfunctions. If the problem cannot be located visually, the motorwcle should be examined by an dealer. authorized HON DA (D Fuul @ Spare ta... WARNING: 1. Never use a fuse with a different rating from that specified on the fuse box or spec ed in the Owner's Manual. 2. Never use conductive material to re- place a recommended fuse or serious damage to the electrical system of your motorcycle will result. oHead Light Beam Adjustment The headlight must be properly adjusted for safe driving. This motorcycle has provisions to adjust the headlight in the vertical and also horizontal directions. a. The vertical adjustment is made by loosening the bolts ® which mount the headlight assembly. The headlight is normally adjusted in the vertical direction so that the center of the beam intersects the ground at the point 50!“ (165 feet) in front of the motor- cycle in the riding attitude. h. The horizontal beam adjustment is made with the adjusting screw ® loca- ted on the left side of the headlight when facing the motorcycle. Turning the screw in will focus the beam toward the left slde of the rider and turning the screw out will focus the beam toward the right side, Adjust the beam IO coincide with the center line of the motorcycle, CAUTION: Adjust the headlighl beam as specified by local laws and regulations. ‘ Q. . (D [let-alight mounting bolt! ® Adjusting screw 80 oSlop Light Switch Adjustment The stop light swttch adjustment is made at the stop light switch (9 located on the right side toward the rear of the englne. 3. Hrs! check the adjustment of the rear brake pedal in accordance With the procedure on page 59 to make sure that the brakes are properly adlusted, p. Turn on the main key switch llgnitinn posinon “Red” dot) c. Adjust the stop light Q) 50 that the stop @ smugnt switch @ Adjusting nut light Wlll come on when the brake pedal is depressed to the point where the brake lust starts to take hold. If the stop light switch is late in switch- ing on the stop light, screw in ® the switch lock nut ® and if the stop light comes on too early, screw out ® the switch lock nut ©. NOTE: There are separate stop light switches for the front and rear brake system. The front stop light switch is attached to the brake hose joint installed on the steering stem bracket. The front stop light switch should be independently checked for proper operation, Malfunc- tions are corrected by replacement with a new switchr okeplacing Light Bulbs When the exchanging the light bulbs, al- ways replace the bulb with that of the specified type and rating. This is import- ant to prevent the electrical lighting circuit from malfunctioning. 6) Horizontal adjusting Icnw ® Holding urevu 81 c. @ Lock vim ® Lock urn" 82 . Install a new sealed beam unit. Headlight Bulb Replacement Procedure Remove horizontal adjusting screw 6) and holding screws @. t Remove the upper and lower retainlng lock pins 6) and screws (9 from the rim. Remove the two sealed beam unil retaining screws 6). As- the procedure semble by reversing described above G) Selledkbenm unit, fllllllhll "I". N .0 Tail/Stoplight Bulb Replacement Procedure Remove the two screws retaining the tail/stop light lens, . Press the bulb (D inward and twist to the lelt, and the bulb can be removedl Replace with a new bulb. . When installing the taillight lens, do not overtighten the screw, as this may damage the lens 3. Turn Signal Light Bulb Replacement HTOOL KIT,,,,,,,,,,,,,,,,,,,,W Procedure The bulb replacement is made in the same manner as tor the tail/stop light bulb in paragraph 2 abovct The tool kit a) is contained in the calm partment located in the battery holder case under the seat. Minor adjustment and parts replacement can be performed with the tools contained m the kit. Adjustments or repalrs which cannot be performed Wllh the tools in the kit should be referred to your HONDA dealer. (9 Toni kit (D Tan/Illa!) light bulb Listed below are the items included in the tool kit - Axle wrench: for axle nuts -14><17mm open end wrench ~ 10><1me open end wrench -8mm open end wrench ~45mm pin wrench: For adjustment of rear suspension -Spark plug wrench 84 . Pliers - No. 2 screw driver - No. 3 cross point screw driver ~ No. 2 cross point screw driver ~ Screw driver grip: for screw driver - Lever: for screw driver ~ Handle: for axle wrench -Too| bag ym,u,”mmay/mm,,,,,,//,,,,,,,,,,,,,,,spEcIF1CAT1oNSW,mWmWWwfl/,/fl///,,,,///,,,/////,,,/,, Item SPECIFICATIONS DIMENSIONS Overall length 2175 mm (85.6 in.) Fuel reserve Iank Passenger capacity ENGINE Bore and stroke Compression rallo Displacement Overall width 370 mm (34, ) Overall height 1,170 mm (46. ) Wheel base 1455mm (57, J WEIGHT Dry welghl 218 kg (479Ibs) CAPACITIES Engine oil 3.5Iitl3,1|mp.ql, 3.7 U.qut) Fuel tank 17.0“: (3.7lmp.gaL, 4.5 U.S.gal.l 5.0m (1.1Imp.gal., 1.3 U15.gal.) Operator and one passenger 61.0X 63,0 mm 12,402 X 2450 in.) 9.0 : 'I 736 CC (44.9 cu. in.) 85 86 Hem Contact breaker poim gap Spark plug gap Valve clearance D.3~0.4 mm (D.D1Z~0,016 in.) O.6~0.7 mm (0.024%.028 in.) INTAKE: 0.05 mm (0.002in,) EXHAUST: 0.08 mm (0.m3in.) CHASSIS AND SUSPENSION Caster Trail Tire size, from Txre size. rear 63° 95 mm (174m) 3.25 H19 (4 PR) 4‘00 H 1B (4 PR) POWER TRANSMISSION Primary reducnon Final reduction Gear ratio, 1sl 2nd 3rd 4th 51h ‘I ,708 2.667 2 ,500 1 .708 1.333 1.097 0.939 Item ELECTRICAL Battery 12 V—14 AH Firing order 1-2-4-3 Spark plugs NGK DaEs~L, DENSO x—z4 E5 Spark plug gap ols~o.7 mm (o.oz4~o.028 in.) 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