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Questions answered: When is my Honda CT70 built?

Hello,

I need to know when my Honda CT70 is built in order to get the papers for it. The VIN is CT70-27*****. Can you help me out here?

Steve

Hi Steve!

Your CT70 is built in 1978! And to give you complete information, your carburetor ID is PB36A and your engine number should start from CT70E-2700001 and up.

(question cleaned up for readability and anonymity)

p81

Tune-Up Specifications for Honda CT70 (H)

These are the tune-up specifications for the Honda CT70/H. The source of this data is Chilton's Honda Singles Repair and Tune-up Guide, 2nd ed. This book covers models made between 1968 and 1975.

Ignition    
Standard spark plug C7HS NGK
Spark plug gap (in./mm) 0.024-0.028/0.6-0.7  
Breaker point gap (in./mm) 0.012-0.016/0.3-0.4  
     
Valve clearance    
Intake (in./mm) 0.002/0.05  
Exhaust (in./mm) 0.002/0.05  
     
Carburetor    
Pilot air screw (turns out) 1 3/4  
Float level (in./mm) 0.78/20.0  
Idle speed (rpm) 1300  
     
Cranking compression (psi) 170  

1 = K3~ : 0.65/16.5
2 = Keihin : 0.78/19.5 - Mikuni : 0.95/24.0
3 = CT90 : 0.85/21.5 - K1 : 0.94/23.5

 

Frame number list for Honda CT70

FRAME NUMBERS HONDA CT70

MODEL FRAME NUMBER DIGITS YEAR NOTES
CT70K0 100001 - 999999 6 1969-1971 US version
        Automatic
        Sold in US from 26-08-1969
CT70HK0 100001 - 999999 6 1970-1971 US version
        Hand clutch
         
Note: K0 and HK0 types always have 6 digit frame numbers
         
CT70K1 2000001 - 2099999 7 1972-1973 US version
        Automatic
CT70HK1 2000001- 2099999 7 1972-1973 US version
        Hand clutch
CT70K2 2100001 - 2299999 7 1973 US version
        Automatic
CT70K3 2300001 - 2399999 7 1974 US version
        Automatic
CT70K4 2400001 - 2500003 7 1975 US version
        Automatic
CT7076 2500001 7 1976 See note [2]
CT7077 2600001 7 1977
CT7078 2700001 7 1978
CT7079 5000001 7 1979
CT7080 5100001 7 1980
CT7081 JH2DD010BSxx 12 1981
CT7082 JH2DD010CSxx 12 1982
Note [1]: The frame number on most CT70 models is located on the frame, directly above the front drive sprocket. If you read CT70-xxxxxx you have a three-speed automatic and if you read CT70H-xxxxxxx you have a manual clutch model.
Note [2]: All frame numbers over 2500004 are noted by year. There is currently an uncertainty of where the frame number is located, but if it is not imprinted as mentioned in note [1], please look on the steering head or under the tank. Another clue can be that Honda placed a sticker on the frame that reads i.e. "1977 Model"
Type indication
Model Type Framenumber
CT70H USA Type CT70H-100001 ~
CT70HKI (1) USA Type CT70HK1-2000001 ~
CT70 USA Type CT70-100001 ~
CT70K1 USA Type CT70-2000001 ~
CT70K2 USA Type CT70-2100001 ~
CT70K3 USA Type CT70-2300001 ~

(c) 2011 - 4-stroke.net - wiki.hobbyist.de (gone :-( )

1969-1971 CT70 K0 CT70E-100001 CT70E-1999999 6 Volt Points Engine
1970-1971 CT70   CT70HE-100001 CT70HE-1999999 6 Volt Points Engine
1972-1973 CT70 K1 CT70E-2000001 CT70E-2099999 6 Volt Points Engine
1972-1973 CT70 HK1 CT70HE-2000001 CT70HE-9999999 6 Volt Points Engine
1973 CT70 K2 CT70E-2100001 CT70E-2299999 6 Volt Points Engine
1974 CT70 K3 CT70E-2300001 CT70E-2399999 6 Volt Points Engine
1975 CT70 K4 CT70E-2400001 CT70E-2499999 6 Volt Points Engine
1976 CT70 76 CT70E-2500001 CT70E-2599999 6 Volt Points Engine
1977 CT70 77 CT70E-2600001 CT70E-2699999 6 Volt Points Engine
1978 CT70 78 CT70E-2700001 CT70E-2799999 6 Volt Points Engine
1979 CT70 79 CT70E-5000001 CT70E-5099999 6 Volt Points Engine
1980 CT70 80 CT70E-5100001 CT70E-5199999 6 Volt Points Engine
1981 CT70 81 DD01E-5200001 DD01E-5299999 6 Volt Points Engine
1982 CT70 82 DD01E-5300001 DD01E-5399999 6 Volt Points Engine
1991 CT70 91 DB01E-2000001 DB01E-2199999 12 Volt CDI
1991 CT70 91 CA Spec. DB01E-2000001 DB01E-2199999 12 Volt CDI
1992 CT70 92 DB01E-2200001 DB01E-2202248 12 Volt CDI
1992 CT70 92 CA Spec. DB01E-2200001 DB01E-2202248 12 Volt CDI
1993 CT70 93 DB01E-2202249 DB01E-2206720 12 Volt CDI
1993 CT70 93 CA Spec. DB01E-2202249 DB01E-2206720 12 Volt CDI
1994 CT70 94 DB01E-2206721 DB01E-2229999 12 Volt CDI
1994 CT70 94 CA Spec. DB01E-2206721 DB01E-2229999 12 Volt CDI

(c) 2017 - 4-stroke.net - recovered from honda50.com

Maintenance data for Honda CT70 (K1~) and CT70H (K1~)

This is the maintenance data for the Honda CL70. The source of this data is Chilton's Honda Singles Repair and Tune-up Guide, 2nd ed. This book covers models made between 1968 and 1975.

Honda CT70, K1 - CT70K, K1  
Fuel, Oil and Tire Pressure  
Gas Tank (gal) 0.66
Engine Oil (qt/l) 0.7/0.7
Front forks @ Leg (oz/cc)  
Tire Pressure 1 Front / Rear (psi) 18/21
   
Battery specifications  
see below  

 

Honda CT70K2~  
Fuel, Oil and Tire Pressure  
Gas Tank (gal) 0.65
Engine Oil (qt/l) 0.7/0.7
Front forks @ Leg (oz/cc) 3.4/100 
Tire Pressure 1 Front / Rear (psi) 17/20
   
Battery specifications  
see below  

 

Honda CT70HK2~  
Fuel, Oil and Tire Pressure  
Gas Tank (gal) 0.66
Engine Oil (qt/l) 0.7/0.7
Front forks @ Leg (oz/cc) 3.4/100 
Tire Pressure 1 Front / Rear (psi) 18/21
   
Battery specifications  
see below  

 

Battery specifications Brand Model Voltage Ah Cont. chrg. rate
CT70/H Yuasa B60-6A 6 2 0.2
CT70K1 Yuasa B60-6 6 2 0.2
CT70HK1 Yuasa B60-6 6 2 0.2

1 = Add 2 psi front, 4-6 psi rear, when carrying a passenger or for high-speed operation
2 = 7-21 psi according to conditions --- not applicable

Periodic maintenance, based upon normal usage after break-in is complete

Weekly

  • Check engine oil level
  • Tire pressure (cold)
  • Spokes for tightness
  • Battery electrolyte level
  • Tightness of critical nuts and bolts
  • Chain adjustment

Every 200 miles

  • Lubricate and adjust drive chain

Every 1500 miles

  • Change engine oil
  • Clean and inspect air filter element
  • Decarbonize spark arrestor

Every 2000 miles

  • Clean and lubricate drive chain

Every 3000 miles

  • Clean and gap spark plug
  • Check points and ignition timing
  • Check valve adjustment
  • Check cam chain tension
  • Check clutch
  • Check carburetor settings
  • Clean fuel filter and sediment bowl
  • Grease fittings
  • Lubricate controls and cables

Every 6000 miles

  • Clean centrifugal and screen oil filters
  • Change front fork oil
  • Adjust steering head bearings

Recall 1969 CT70 - 08-24-71 - 71V146000

 
NHTSA Campaign Number 71V146000
Vehicle/Equipment Make HONDA
Vehicle/Equipment Model CT70
Model Year 1969
Mfg Component Desc STRUCTURE:FRAME AND MEMBERS
Mfg Involved in Recall AMERICAN HONDA MOTOR CO.
Type of Report (V) Vehicle
Potential # of Units Affected 4,200
Date Owner Notified by Mfg 08-13-71
Recall Initiated By MFR
Mfg Responsible for Recall HONDA (AMERICAN HONDA MOTOR CO.)
Report Received Date 08-24-71
Record Creation Date 10-12-79
Notes Possibility that frame was incompletely welded in lower steering head area. Condition, in this location, decreases structural strength and may cause forward frame area to crack under stress and bend out of alignment. If front bends out of alignment would be a reduction of vehicle control. (correct by welding steering head where necessary.)