C70 dimensions, torque specifications, model history and more.
Specifications
Honda C70 Specifications
|
|
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 |
{slider Torque Specifications}
Torque Specifications
|
|
|
|
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 |
Manuals
These will open as PDFs
