Introduction
This page lists the maintenance and general specifications of the C70 from 1970 to 1986. Other pages deal with maintenance and repair of the bike, through the Small Honda Homepage. This specifications chart is not yet complete. There were numerous detail changes to the bikes during this period, and some markets also had other variations. Generally, up until the mid to late 1970's they used a down draught carburettor, but for the later ones they switched to a side draught. The frame was modernised slightly in style in about 1982, although the older frame continued to sell a little beyond this. The most significant change was from 6 volts and points ignition to 12 volts and CDI electronic ignition. Electric start was fitted for some markets, but only as an option in others. Electric start models had a slightly different fairing.Models sold in north America in the early 1980's were known as the 'Passport'. Clymer: M310-12, ISBN 0-89287-683-2.
| | Chassis No./ VIN no. | Colors | |
C70M C70MKO CM70 | 1970-71 | C70M 017962 - | Aquarius Blue Bright Red Pine Green | 2 seater seat, rear passenger footpegs, electric start, "HONDA 70" badge on fuel tank, |
C70K1 C70MK1 | 1972-73 | C70 2000000 - | Strato Blue Met. Poppy Yellow Met. | "Honda 70" fuel tank badge, single seater seat, rear luggage rack, electric start |
C70 | 1972-77 | Smooth curved frame, round front indicators, headlamp part of handlebar shroud, 6v electrics, points ignition, OHC engine | ||
C70Z-2 | 1977-79 | As above | ||
C70Z-Z | 1979-1983 | As above | ||
Passport | 1980 | DA01 1000014 - | Parakeet Yellow Angel Blue | The yellow bike had a brown and white seat, the blue bike had a black and white seat, 2 seater seat |
Passport | 1981 | JH2DA0106BS100003 - | Parakeet Yellow Angel Blue Monza Red | 2 seater seat in black and white, front basket and rack, short rear rack, "PASSPORT" on fuel tank, electric start, modified engine side covers |
Passport | 1982 | JH2DA0107CS200001 - | Angel Blue Monza Red | As above, plus now 12 volt electrics and CD ignition, electric start, frame and leg shields more squared off. |
Passport | 1983 | JH2DA0107DS300004 - | Blue Met. Special Silver Met. Monza Red | as above. plus the modified side covers no longer used and rear shocks were full length. |
C70-C | 1982-84 | A more squared off frame, 12v electrics, CDI ignition | ||
C70-E | 1984-86 | As above. |
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Dimensions | Overall Length | | |
Overall Width | | | |
Overall Height | | | |
Wheelbase | | | |
Seat Height | | | |
Min. Ground Clearance | | | |
Dry Weight | | | |
Frame | Type | Pressed & tube steel type | |
F suspension, travel | Leading link, travel 2.2 in. (55 mm) | ||
R suspension, travel | Swing arm, travel 2.4 in. (60 mm) | ||
F tire size, pressure | 2.25x17-4PR, 28 psi | 2.25x17-4PR, 2.0 kg/cm2 | |
R tire size, pressure | 2.50x17-6PR, 28 psi (40 psi when laden) | 2.50x17-6PR, 2.0 kg/cm2 (2.8 when laden) | |
F brake, lining area | Cable, Internal expanding shoes, area 13.4 sq-in. (86.4 sq-cm) | ||
R brake, lining area | Rod, Internal expanding shoes, area 13.4 sq-in. (86.4 sq-cm) | ||
Fuel capacity | | ||
Fuel reserve capacity | | ||
Caster angle | 64 deg. | ||
Trail length | | ||
Engine | Type | Air cooled, 4 stroke OHC engine | |
Cylinder arrangement | Single cylinder 80 deg inclined from vertical | ||
Bore and stroke | 1.850 x 1.630 in. | 47.0 x 41.4 mm | |
Displacement | 4.4 cu-in. | 72cc | |
Compression Ratio | 8.8 : 1 | ||
Valve train | Chain driven overhead camshaft | ||
Maximum horsepower | | ||
Maximum torque | 3.9 lb/ft at 5500 rpm | 0.56 kg-m at 5500 rpm | |
Oil capacity | | | |
Lubrication system | Forced and wet sump | ||
Cylinder head compression pressure | 178 +/-7 psi at 1000 rpm | 12.5 +/-0.5 kg/cm2 at 1000 rpm | |
Intake valve opens | 0 deg BTDC | ||
Intake valve closes | 20 deg ABDC | ||
Exhaust valve opens | 25 deg BBDC | ||
Exhaust valve closes | 5 deg ATDC | ||
Valve tappet clearance | | | |
Idle speed | 1500 +/-100 rpm | ||
Carburation | Carburettor Type | Piston valve (slide), 14mm (0.55") venturi bore | |
ID. Number | 1980 model: PB32A | 1981 model: PB32C | |
Float Level | | | |
Drive Train | Clutch | Wet, multi plate, semi-auto centrifugal type | |
Transmisson | 3 speed constant mesh | ||
Primary reduction | 4.058 | ||
Gear Ratio 1 | 3.272 | ||
Gear Ratio 2 | 1.722 | ||
Gear Ratio 3 | 1.190 | ||
Final reduction | 2.571, drive sprocket XXT, driven sprocket XXT | ||
Gear shift pattern | Left foot operated return system, N-1-2-3 | ||
Electrical | Ignition | Flywheel magneto | |
Points Gap | | | |
Ignition Timing "F" Mark | | ||
Advance Start | 1875 rpm | ||
Full Advance | | ||
Starting System | Kick starter and/or starter motor | ||
Generator | Flywheel AC generator, 57W at 5000 rpm | ||
Battery Capacity | 6 V, 11 Ah | ||
Spark plug (normal) | NGK C7HS or ND U22FS | ||
Spark plug (cold climates) | NGK C6H or ND U20FS | ||
Spark plug (high speeds) | NGK C9H or ND U24FB | ||
Spark Plug Gap | 0.024 - 0.028" / 0.6 - 0.7 mm | ||
Fuse Capacity | 10 A |
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| | | | | |
Engine | Cylinder Head Cover | | | | |
Camshaft Sprocket | | | | | |
Clutch Locknut | | | | | |
Final Drive Sprocket | | | | | |
Flywheel | | | | | |
Spark Advancer | | | | | |
Frame | Steering Stem Nut | | | | |
Handlebar Setting Nut | | | | | |
Steering Lock | | | | | |
Front Axle Nut | | | | | |
Engine Hanger Bolt | | | | | |
Rear Axle Nut | | | | | |
Final Driven sprocket | | | | | |
Rear Brake Torque Link | | | | | |
Rear Shock Absorber | | | | | |
Foot Peg | | | | | |
Swing Arm Pivot Bolt | | | | | |
Front Suspension Pivot Bolt | | | | | |
Front Suspension Pivot Bolt | | | | | |
Front Shock Absorber Upper Bolt | | | | | |
Front Turn Signal Stay | | | | | |
General | 5 mm bolt/nut | | | ||
6 mm bolt/nut | | | |||
8 mm bolt/nut | | | |||
10 mm bolt/nut | | | |||
12mm bolt/nut | | | |||
5 mm screw | | | |||
6 mm screw | | | |||
6 mm flange bolt/nut | | | |||
8 mm flange bolt/nut | | | |||
10 mm flange bolt/nut | | |
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