1969-1982 Honda ST50 / ST70 / CT70 / 70H Shop Manual
Comprehensive service documentation for Honda ST50, ST70, CT70, and 70H models spanning 1969-1982 production. Covers engine removal, valve clearance, carburetor adjustment, and transmission repair procedures.
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Sample pages from the 1969-1982 Honda ST50 / ST70 / CT70 / 70H Shop Manual manual
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Honda Models Covered & Key Technical Specifications
Models: Honda ST50, ST70, CT70, 70H, CT70K1, CT70K2, CT70K3, CT70H, CT70HKI, CT70K4, CT70K6, CT70K7, CT70 Z, CT70 A, CT70 B, CT70 C
Sub-models / Variants: England type, General type, U.S.A. type, General Export type
Build Years: 1969–1982
Serial Numbers: ST50 111528~, ST70 108801~, ST70 505971~, ST70 137314~, CT70H 100001~, CT70HKI 2000001~, CT70 100001~, CT70K1 2000001~, CT70K2 2100001~, CT70K3 2300001~
Technical Data:
- Engine displacement: 72 cc (4.4 cu in)
- Bore and stroke: 47 × 41.4 mm (1.85 × 1.63 in)
- Compression ratio: 8.8:1
- Crankcase oil capacity: 0.8 L (0.17 US qt)
- Maximum horsepower: 4.0–5.6 hp at 8000 rpm
- Maximum torque: 0.50–0.87 kg·m at 4000–8000 rpm
- Ignition type: Flywheel magneto
- Transmission: 3-speed or 4-speed constant mesh
Honda Manual Features & Content Preview
1969–1982 Honda ST50, ST70, and CT70 Series Technical Documentation
- Covers 1969–1982 Honda ST50, ST70, CT70, and CT70H minibikes, including detailed technical specifications for UK, General Export, and U.S.A. type variants
- Official workshop publication featuring cross-references to the 50/65 Shop Manual (Code No. 620401)
- Contains 125 technical diagrams, exploded-view illustrations, and comprehensive torque-value tables for major engine and frame fasteners
- No shipping wait — the PDF is available immediately after purchase
- Indexed PDF search covers every chapter and appendix
- This 130-page edition documents the evolution of the CT70 series through the 1982 'C' model, providing consistent service parameters across all early-series engine and chassis configurations
Factory Service and Maintenance Scope
The 1969–1982 Honda ST50/CT70 manual details procedures for engine removal, lubrication system maintenance, and cylinder head assembly. It outlines the inspection criteria for the piston, clutch components, and crankshaft balance, providing standard wear limits for internal engine components. The document covers the transmission and gear shift mechanisms, including exploded views for the 3-speed and 4-speed variations found across the ST and CT product lines.
Specifications and Technical Data Preview
This publication provides detailed engine performance data, including horsepower and torque ratings at specific RPM ranges. Standard clearances and wear limits for valve seats, piston rings, and crankshaft radial clearance are listed to assist in condition assessment. Electrical reference values for the flywheel magneto, ignition coil, and various 6V bulb specifications are documented in the wiring system chapters. Cylinder head bolt torque values are specified at 90–120 kg-cm (6.5–9 ft-lb) for the standard assembly sequence. Fuel system specifications, including carburetor jetting for different models and high-altitude operation, are provided for the Keihin piston-valve type units. how factory workshop documentation is structured for these vintage Honda machines ensures that service standards remain consistent for both professional workshops and restorers. Note: This page is a contents overview for the manual. It does not provide repair or diagnostic instructions. An official 130-page Honda workshop manual covering the 1969–1982 ST50, ST70, and CT70 series, documenting engine, chassis, electrical, and carburetor specifications for the various international and U.S. market model builds.
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