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Frame number list for Honda C70

FRAME AND ENGINE NUMBERS HONDA C70

MODEL FRAME NUMBER ENGINE NUMBER YEAR NOTES
         

 

1970-1971 C70M K0 C70ME-000001 C70ME-1999999 6 Volt Points Engine
1972-1973 C70 K1 C70E-2000001 C70E-9999999 6 Volt Points Engine
1980 C70 '80 DA01E-1000001 DA01E-2099999 6 Volt Points Engine
1981 C70 '81 DA01E-2100001 DA01E-2199999 6 Volt Points Engine
1982 C70 '82 DA01E-2200001 DA01E-2299999 12V CDI
1983 C70 '83 DA01E-2300001 DA01E-9999999 12V CDI


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

 

Tune-Up Specifications for Honda C70

These are the tune-up specifications for the Honda C70. 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 1/2  
Float level (in./mm) 0.60/15.5  
Idle speed (rpm) 1200  
     
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

 

Maintenance data for Honda C70 (M)

This is the maintenance data for the Honda C70M. 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.

Fuel, Oil and Tire Pressure  
Gas Tank (gal) 1.2
Engine Oil (qt/l) 0.7/0.7
Front forks @ Leg (oz/cc)  
Tire Pressure 1 Front / Rear (psi) 25/28
   
Battery specifications  
Brand Yuasa
Model 6N11-2D
Voltage 6
Amp hrs. 11
Continuous Charging Rate (Amps) 1.1

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

Tune-Up Specifications for Honda C70M

These are the tune-up specifications for the Honda C70M. 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 1/8  
Float level (in./mm) 0.60/15.5  
Idle speed (rpm) 1200  
     
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

 

How to identify your Honda C70

This article refers to C70 models after 1977 and sold in the UK.

When working on a later model always refer to this article first; where no information is given it can be assumed that the procedure is essentially the same as that described for the earlier models. It is essential to identify exactly the model being worked on; to assist the owner in this, the major identifying points of each are given below with the relevant frame numbers, where available. Where only one frame number is given, this is the number at which that particular model's production run commenced. Note that the frame number is the only accurate means of identifying a particular model. The Z-2 models are largely identical to the original versions, the only significant difference being the fitting of a new type of carburettor with a handlebar-mounted choke operated by cable. The Z-Z models can be identified by the conical-ended silencer. They employed modified components to give a revised gelselection pattern.

 The C70-C models are easily distinguished by their two-tone dualseats and restyled headlamp cowling and legshields. They all feature modified air filters, 12 volt electrics and CDI ignition systems. In addition to this, the C90 engine/gearbox unit was completely redesigned and is now exactly the same in layout as that of the C70 model, its new bore and stroke dimensions giving a capacity of 86cc.

The C70-E models, also known as the 'Super Cub' or 'Economy' models, are largely the same as the -C models but feature heavily revised cycle parts with more angular styling and are fitted with larger, rectangular flashing indicator lamps and head lamps; a fuel gauge is fitted and the handlebar controls improved.

Model Frame number
C70Z-2 C70-6115364 to C70-6193904
C70Z-Z C70Z-7000026
C70-C C70-8022434 to C70-8039828
C70-E N/A

 Source: Haynes OWM - ISBN 1859600123