Honda CT70H User Manual

HO
NDA
ST50 – 70 CT70 – CT70H
1969 - 1982 Shop Manual
INDEX
Click on the section you want to go to
Specifications - 7
Special Tools -12
Engine - 14
Engine Removal & Installation – 14
Lubrication System – 16
Cylinder & Cylinder Head – 17
Cam Chain Tensioner – 23
Piston & Piston Rings – 23
Clutch – 25
Crankshaft - 27
Transmission - 29
Gear shift Mechanism - 31
Kick Starter - 32
Carburetor - 33
Tightening Torque Limits - 35
Frame - 36
Handlebar - 36
Front Fork - 37
Front Cushion - 38
Rear Cushion - 40
Front Wheel - 41
Rear Wheel - 44
Braking System - 46
Rear Fork - 47
Drive Chain - 48
Air Cleaner - 48
Electrical System - 49
A.C Generator Inspection -50
Ignition Coil - 50
Condenser Inspection - 51
Silicon Rectifier -52
Battery - 52
Switches - 53
Wiring Diagrams
ST50 (U.K Type) - 57
ST70 - I (General Export) - 58
ST70 – II (General Export) - 59
CT70 (U.S.A Type) - 60
CT70H (U.S.A Type) - 61
Index - 62
CT70 K4 Addendum - 63
CT70 K6 1977 Addendum - 67
CT70 K7 1978 Addendum - 71
CT70 Z 1979 Addendum - 73
CT70 A 1980 Addendum - 97
CT70 B 1981 Addendum - 115
CT70 C 1982 Addendum - 117
Maintenance Schedule - 119

Honda CT70H Specifications

General

Compression Ratio	8.8:1
Starter	Kick
Transmission	3-speed automatic
Final Drive	Chain
Front Suspension	Telescopic fork
Front Brake	Drum
Rear Brake	Drum
Bore and Stroke	47.0mm x 41.4mm
Rear Suspension	Swingarm with dual shocks
Engine	72cc 4-stroke single cylinder, OHC

Summary

1. SPECIFICATIONS

1.1 Specifications

Detailed specifications for various models including dimensions, frame, engine, and electrical systems.

3. ENGINE

3.1 Engine Removal and Installation

Procedures for removing and installing the engine from the motorcycle frame.

3.2 Lubrication System (Oil Pump)

Description, disassembly, and inspection of the engine's lubrication system and oil pump.

3.3 Cylinder and Cylinder Head

Description, disassembly, and inspection of the cylinder and cylinder head components.

3.5 Piston and Piston Rings

3.6 Clutch

3.7 Crankshaft

3.8 Transmission

3.9 Gear Shift Mechanism

3.10 Kick Starter

3.11 Carburetor

3.12 Tightening Torque Limits

4. FRAME

4.1 Handle Bar

Description, disassembly, inspection, and reassembly of the handlebar.

4.2 Front Fork

4.3 Front Cushion

4.4 Rear Cushion

4.5 Front Wheel

4.6 Rear Wheel

4.7 Braking System

4.8 Rear Fork

5. ELECTRICAL SYSTEM

5.1 A.C. Generator

Information on A.C. generator direction of rotation and charging performance.

5.2 Ignition coil

Method for testing the serviceability of the ignition coil.

5.5 Battery

5.6 Switches

6. WIRING DIAGRAM

6. Maintenance schedule

11. CT70K6 '77 ADDENDUM

2. WIRING DIAGRAM

Wiring diagram specific to the CT70 '77 model.

3. MAINTENANCE SCHEDULE

4. SPECIFICATIONS

2. MAINTENANCE SCHEDULE

V. INSPECTION AND ADJUSTMENT

1. ENGINE OIL

Procedures for checking and changing the engine oil, including viscosity recommendations.

1. SPARK PLUG

2. ENGINE OIL FILTER SCREEN/CENTRIFUGAL OIL FILTER

2. ENGINE OIL

Recommendations for engine oil type and viscosity based on temperature.

3. FRONT BRAKE

6. SPARK PLUG

7. VALVE CLEARANCE

8. CONTACT BREAKER POINT GAP AND IGNITION TIMING

9. CAM CHAIN ADJUSTMENT

11. CARBURETOR IDLE SPEED

13. DRIVE CHAIN

14. BATTERY

16. BRAKE SYSTEM

19. CLUTCH ADJUSTMENT

21. SUSPENSION

VI. CARBURETOR

PILOT SCREW ADJUSTMENT

VII. HANDLEBAR

I. SPECIFICATIONS

II. SPECIAL TOOLS/COMMON TOOLS

III. WIRING DIAGRAM

IV. MAINTENANCE SCHEDULE

VI. FUEL SYSTEM

1. CARBURETOR SPECIFICATIONS

2. PILOT SCREW REMOVAL/INSTALLATION

3. PILOT SCREW ADJUSTMENT

VIII. FRONT FORK

1. FRONT FORK REMOVAL

2. FRONT FORK DISASSEMBLY

IX. SHOCK ABSORBER

XI. BATTERY

XII. A.C. GENERATOR

3. SPARK PLUG

4. OIL RECOMMENDATION

5. FUEL SYSTEM

PASSAGES AND JET CLEANING

6. OIL PUMP

7. CYLINDER HEAD AND VALVES

9. WIRING DIAGRAM