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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Models Covered & Key Technical Specifications
Honda ST50, ST70, CT70, 70H — 1969–1982 Diagnostic Compendium Kit | ST70 Series Repository.
- Published Displacement Data: 72 cc (4.4 cu in) corresponds to the engine cylinder volume Architecture.
- Measured Bore and Stroke: For optimal engine dimensions, 47 × 41.4 mm (1.85 × 1.63 in) is calibrated to the piston assembly Norms.
- Specific Compression Ratio: 8.8:1 determines the combustion chamber pressure increment Bounds.
- Integral Oil Capacity: The crankcase requires 0.8 L (0.17 US qt, 0.14 Imp qt) for forced and wet sump Topology.
- Operational Maximum Horsepower: Peak output reaches 4.5–5.6 hp at 8000 rpm Matrix.
- Authorized Torque Output: Maximum engine torque is calibrated to 0.50–0.87 kg·m at 5500–8000 rpm Standards.
Professional Workshop Service Manual & Technical Specifications
Systematic Reference Service Manual: Minibike Official Service Reference: Honda ST50, ST70, CT70, 70H (1969-1982) Library-Master
Performance-Values: ST50, ST70, CT70, CT70H, CT70K1, CT70K2, CT70K3, CT70HK1 // System-Identifier: Engine, Drive Train, Electrical / Emission Control Logic // Performance-Values: 132 pages with comprehensive technical framework and standard specifications.
| Integrated-Framework | Parameters | Context |
|---|---|---|
| Engine Specifications | Bore, stroke, displacement, compression ratio, horsepower, torque | Documented for all model variants |
| Drive Train Systems | Clutch type, transmission ratios, primary reduction, gear shift pattern | Complete specifications provided |
| Electrical Components | Generator, battery, spark plugs, lighting systems, ignition specifications | Full technical data included |
Featuring a modular arrangement of the engine removal procedures, the manual covers lubrication systems, cylinder and cylinder head service, and cam chain tensioner adjustment. The transmission assembly and gear shift mechanism documentation flows alongside clutch inspection protocols, crankshaft service guidelines, and kick starter mechanics, complemented by carburetor specifications and comprehensive ignition system data.
Integrated Topology
Maintenance guidelines are included for engine servicing procedures, including oil pump disassembly, cylinder head inspection, valve spring measurement, and piston ring assessment. The framework documents specifications for compression ratios, valve clearances, and standard service limits across all engine variants, with particular emphasis on the four-stroke overhead cam design shared by the ST50 and ST70 models.
Integrated Framework
OEM guidelines are included for frame and suspension components, addressing the handlebar assembly construction, front fork ball bearing maintenance, front and rear cushion disassembly procedures, and brake pedal pivot service. The manual provides detailed inspection protocols for steering head assembly, suspension geometry, and structural integrity checks essential for safe operation.
Structured Sequences
Transmission service information covers constant mesh gear selection, primary reduction ratios, and three-speed sequential shifting patterns. The document addresses clutch adjustment procedures for both automatic centrifugal and manual type systems, with measurement standards for friction disc thickness and spring compression specifications clearly referenced.
Structured Interface
HVAC system procedures are included for air cleaner element maintenance, intake manifold routing, and carburetor float level adjustment. The manual documents the relationship between air intake systems and emission control apparatus, including crankcase breather separator installation, fuel system component specifications, and throttle cable routing configuration.
Precise Parameters
Torque specifications are documented for the engine fastening points to ensure proper assembly security and thermal expansion compensation. The manual includes torque data for cylinder head studs, cam sprocket bolts, flywheel attachment, clutch assembly nuts, and crankcase cover fasteners, with values organized by component type and application across the model range.
Additional Coverage
The service manual references wiring diagrams for ST70D, CT70H, HK1, and later model variants. Addendum sections from 1978 through 1982 model years document fuel valve modifications, throttle grip design changes, shock absorber updates, maintenance schedule revisions, carburetor setting adjustments, and emission control system procedures specific to United States regulatory requirements. The document includes specifications for high altitude carburetor adjustments above 6,500 feet, battery construction evolution, turn signal assembly procedures, and vehicle identification number location standards.
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