JTX1000 Gold

Honda C70


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

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