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

Download Service Manual :http://www.ziddu.com/downloadlink/13300295/Honda-CUP-C70-Passport-80-81-Service-Manual.zip