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Honda ST70 User Manual

Honda ST70
131 pages
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HO
NDA
ST50 – 70 CT70 – CT70H
1969 - 1982 Shop Manual
INDEX
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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
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Honda ST70 Specifications

General IconGeneral
Displacement72 cc
Compression Ratio8.8:1
Front SuspensionTelescopic fork
Fuel SystemCarburetor
Final DriveChain
Cooling SystemAir cooled
Transmission3-speed
BrakesDrum brakes front and rear
Bore x Stroke47 mm x 41.4 mm
Rear SuspensionSwingarm with dual shocks

Summary

Important Safety Notices

Warning and Caution Label Definitions

Defines the meaning of WARNING and CAUTION labels for safety.

Specifications Overview

Detailed Vehicle Specifications

Lists technical data for dimensions, frame, engine, etc.

Engine Section

Engine Removal and Installation

Describes the procedure for removing and installing the engine.

Lubrication System (Oil Pump)

Explains oil flow and oil pump disassembly.

Cylinder and Cylinder Head

Details cylinder head material and cylinder construction.

Clutch Description and Assembly

Describes clutch types and assembly for various models.

Crankshaft Description and Disassembly

Details crankshaft lubrication and disassembly steps.

Tightening Torque Limits

Specifies torque values for major engine fasteners.

Frame Section

Electrical System Section

Charging Test Procedure

Explains how to perform a charging test using voltmeter and ammeter.

A.C. Generator Inspection

Details resistance measurements for the generator primary coil.

Ignition Coil and Condenser Inspection

Covers measuring ignition coil resistance and condenser capacity.

Silicon Rectifier and Battery Inspection

Details checking rectifier continuity and battery electrolyte level.

Switches Continuity Check

Describes checking combination switch continuity.

Wiring Diagrams Section

ST 50 (U.K Type) Wiring Diagram

Electrical schematic for the ST 50 (U.K Type).

ST 70-1 (General Export Type) Wiring Diagram

Electrical schematic for the ST 70-1 (General Export Type).

ST 70-II (General Export Type) Wiring Diagram

Electrical schematic for the ST 70-II (General Export Type).

CT 70 (U.S.A. Type) Wiring Diagram

Electrical schematic for the CT 70 (U.S.A. Type).

CT 70H (U.S.A. Type) Wiring Diagram

Electrical schematic for the CT 70H (U.S.A. Type).

CT70 K6 '77 Specifications

CT70 '79 Specifications

CT70 '79 Wiring Diagram

Inspection and Adjustment (CT70 '79)

Engine Oil Level Check and Change

Describes how to check and change engine oil.

Engine Oil Filter Screen and Crankcase Breather

Covers cleaning oil filter screen and draining breather deposits.

Air Cleaner, Fuel Lines, and Spark Plug

Details air cleaner cleaning, fuel line replacement, and spark plug inspection.

Valve Clearance and Contact Breaker Points

Explains valve clearance adjustment and contact breaker point inspection.

Ignition Timing and Cam Chain Adjustment

Covers ignition timing adjustment and cam chain tension adjustment.

Throttle Operation and Carburetor Idle Speed

Details throttle operation checks and carburetor idle speed adjustment.

Drive Chain (CT70 '79)

Battery (CT70 '79)

Battery Inspection and Charging

Details battery inspection, fluid level, and charging procedure.

Brake System (CT70 '79)

Clutch Adjustment

Clutch Adjustment Procedure

Details how to adjust the clutch with the engine stopped.

Suspension System

CT70 '80 Specifications

Special and Common Tools

CT70 '80 Wiring Diagram

Inspection and Adjustment (CT70 '80)

Spark Plug and Engine Oil Procedures

Covers spark plug installation and engine oil recommendations.

Front Brake Lubrication and Free Play

Describes front brake lubrication and free play adjustment.

Front Fork System

Shock Absorber System

CT70 '82 Specifications

Spark Plug Procedures

Oil Recommendation

Cylinder Head and Valves

Wiring Diagram (CT70 '82)

Wiring Diagram Schematics

Provides the electrical wiring diagram.

Ignition and Carburetion Specifications

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