C70 Model History | ||||
Model | Production | Chassis No./ VIN no. | Colors | Notes |
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. |
English | Metric | ||
Dimensions | Overall Length | 71.1 in. | 1805 mm |
Overall Width | 26.2 in. | 685 mm | |
Overall Height | 39.2 in. | 995 mm | |
Wheelbase | 46.5 in. | 1180 mm | |
Seat Height | 29.9 in. | 760 mm | |
Min. Ground Clearance | 5.1 in. | 130 mm | |
Dry Weight | 184 lbs. | 83.5 kg | |
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 | 1.05 US gal./4.0 l. | ||
Fuel reserve capacity | 0.21 US gal./0.8 l. | ||
Caster angle | 64 deg. | ||
Trail length | 2.8 in./ 70 mm | ||
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 | 5.0 BHP at 7000 rpm | ||
Maximum torque | 3.9 lb/ft at 5500 rpm | 0.56 kg-m at 5500 rpm | |
Oil capacity | 0.74 US qt. | 0.7 l | |
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 | IN-EX 0.0002 in. | IN-EX 0.05mm | |
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 | 0.42" | 10.7mm | |
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 | 0.012 - 0.016" | 0.3 - 0.4 mm | |
Ignition Timing "F" Mark | 15o BTDC, Static | ||
Advance Start | 1875 rpm | ||
Full Advance | 30o BTDC, at 2900 rpm | ||
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 |
Bolts & Other Fasteners | |||||
Torque | |||||
Item | Quantity | Thread dia. (mm) | kg-m | ft-lb | |
Engine | Cylinder Head Cover | 4 | 6 | 0.9 - 1.2 | 7 - 9 |
Camshaft Sprocket | 3 | 5 | 0.5 - 0.9 | 4 - 7 | |
Clutch Locknut | 1 | 14 | 3.8 - 4.5 | 28 - 33 | |
Final Drive Sprocket | 2 | 6 | 1.0 - 1.4 | 7 - 10 | |
Flywheel | 1 | 10 | 5.5 - 6.5 | 40 - 47 | |
Spark Advancer | 1 | 6 | 0.9 - 1.2 | 7 - 9 | |
Frame | Steering Stem Nut | 1 | 22 | 6. 0 - 9.0 | 43 - 65 |
Handlebar Setting Nut | 2 | 8 | 2.0 - 3.0 | 14 - 22 | |
Steering Lock | 2 | 6 | 0.6 -1.3 | 4 - 9 | |
Front Axle Nut | 1 | 10 | 3.0 - 4.0 | 22 - 29 | |
Engine Hanger Bolt | 2 | 8 | 2.5 - 3.5 | 18 - 25 | |
Rear Axle Nut | 1 | 12 | 4. 0 - 5.0 | 29 - 36 | |
Final Driven sprocket | 4 | 8 | 2.0 - 2.5 | 14 - 18 | |
Rear Brake Torque Link | 2 | 8 | 1.0 - 2.0 | 7 - 14 | |
Rear Shock Absorber | 4 | 10 | 2.0 - 3.0 | 14 - 22 | |
Foot Peg | 4 | 8 | 2.0 - 2.5 | 14 - 18 | |
Swing Arm Pivot Bolt | 1 | 10 | 3.0 - 4.0 | 22 - 29 | |
Front Suspension Pivot Bolt | 2 | 8 | 1.0 - 2.0 | 7 - 14 | |
Front Suspension Pivot Bolt | 2 | 8 | 2.0 - 3.0 | 14 - 22 | |
Front Shock Absorber Upper Bolt | 2 | 8 | 2.5 - 3.5 | 18 - 25 | |
Front Turn Signal Stay | 4 | 0.35 - 0.5 | 2.5 - 3.6 | ||
General | 5 mm bolt/nut | 0.45 - 0.6 | 3.3 - 4.3 | ||
6 mm bolt/nut | 0.8 - 1.2 | 6 - 9 | |||
8 mm bolt/nut | 1.8 - 2.5 | 13 - 18 | |||
10 mm bolt/nut | 3.0 - 4.0 | 22 - 29 | |||
12mm bolt/nut | 5.0 - 6.0 | 36 - 43 | |||
5 mm screw | 0.35 - 0.5 | 2.5 - 3.6 | |||
6 mm screw | 0.7 - 1.1 | 5 - 8 | |||
6 mm flange bolt/nut | 1.0 - 1.4 | 7 - 10 | |||
8 mm flange bolt/nut | 2.4 - 3.0 | 17 - 22 | |||
10 mm flange bolt/nut | 3.0 - 4.0 | 22 - 29 |
Download Service Manual :http://www.ziddu.com/downloadlink/13300295/Honda-CUP-C70-Passport-80-81-Service-Manual.zip
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