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.
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
Model 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
- Complete coverage for 1969–1982 Honda ST50, ST70, CT70, and CT70H minibikes, including UK, General Export, and US variants.
- Features 125 technical diagrams, exploded views, and comprehensive torque-value tables for major engine and frame fasteners.
- Provides direct cross-references to the 50/65 Shop Manual (Code No. 620401) for expanded diagnostic context.
- Fully indexed and searchable 130-page PDF, delivered as an instant download directly to your device.
Whether you are restoring a classic CT70 or maintaining an ST50 for weekend rides, this manual outlines the exact factory specifications needed for the job. It breaks down critical systems like the transmission, gear shift mechanisms, and clutch components. You get clear exploded views for both 3-speed and 4-speed variations. Always verify standard wear limits and use the correct torque specifications detailed in this manual before reassembling critical engine components to ensure safe operation. Since this is an instant download, you can pull up these exact tolerances on your tablet right at the workbench without waiting for shipping.
The technical data sections deliver precise engine performance metrics, including horsepower and torque ratings at specific RPM ranges. It lists standard clearances for valve seats, piston rings, and crankshaft radial play. For electrical diagnostics, the manual covers 6V bulb specifications, flywheel magneto reference values, and ignition coil outputs. Cylinder head bolt torque values are strictly specified at 90–120 kg-cm (6.5–9 ft-lb) for the standard assembly sequence. Carburetor jetting configurations for Keihin piston-valve units, including high-altitude adjustments, are also clearly mapped out. Understanding how factory workshop documentation is structured for these vintage Hondas guarantees that your rebuild meets original manufacturer standards.
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