🏷️ Basic Information Identification Make: Honda Model: ST50 / ST70 / CT70 / CT70H Product Name: 1969-1982 Honda ST50-70 CT70-70H Service Repair Manual PDF Download Generation Covered Years: 1969, 1970, 1971, 1972, 1973, 1974, 1975, 1976, 1977, 1978, 1979, 1980, 1981, 1982 Codes Model Codes: ST50, ST70, CT70, CT70H 👋 Introduction Market Position Target Audience: Owners and mechanics seeking detailed information for maintaining and repairing vintage Honda ST/CT series motorcycles Competitive Analysis Value Proposition: Provides essential technical data and procedures to restore and maintain these iconic small motorcycles, saving on professional repair costs Key Features Uniqueness: Specific coverage for multiple model years and variants, including important addenda for later models Utility: Empowers users with the knowledge to perform a wide range of maintenance and repair tasks 📋 Manual Details Coverage Areas Manual Coverage Scope: Comprehensive workshop repair and service information Page Count Estimated Page Count: Significant; exact count not provided but implied to be extensive covering multiple model variants and years Manual Type Type: Workshop Service Repair Manual Language Language: English Format Format: PDF Download 📖 Manual Coverage Systems Covered Engine Overhaul: Complete engine disassembly, inspection, repair, and reassembly Fuel System Maintenance: Carburetor adjustment and cleaning, fuel tank and line service Transmission Service: Clutch, gearbox, and final drive unit maintenance and repair Electrical Diagnostics: Ignition system, lighting, charging system, and wiring harness troubleshooting Frame And Suspension: Frame inspection, steering, front forks, and rear suspension maintenance Braking System: Brake lever, cable, and drum brake servicing Wheel And Tire: Wheel bearing service, spoke tensioning, tire replacement Procedures Included Routine Maintenance: Oil changes, filter replacement, chain adjustment, lubrication points Troubleshooting Guides: Systematic diagnostic procedures for common problems Engine Rebuild: Piston, cylinder, crankshaft, and valve servicing procedures Electrical Component Testing: Coil, spark plug, battery, and lighting circuit testing Wiring Diagram Interpretation: Detailed schematics for troubleshooting and repair Addendum Updates: Specific repair and adjustment information for various model year addendums (K4, K6, K7, Z, A, B, C) Technical Depth Diagnostic Capabilities: Advanced diagnostic information, including troubleshooting charts and expected values Repair Complexity: Suitable for both intermediate DIY enthusiasts and professional mechanics Specifications Detail: Precise torque values, clearances, and adjustment specifications 📊 Manual Specifications File Format File Type: PDF Compatibility: All Versions of Windows & Mac Print Quality Readability: High-quality scans ensuring clear text and legible diagrams Binding Type Delivery Method: Digital Download (Not a physical book) Paper Type Digital Format Details: Searchable text and image quality suitable for on-screen viewing and selective printing ⚙️ Engine Specifications Primary Engine Engine Type: Air-cooled, four-stroke, SOHC (Single Overhead Camshaft) Displacement St50: 49cc Displacement St70: 69cc Displacement Ct70: 72cc (later models may vary slightly, typically 71.7cc) Performance Bore X Stroke St50: 39.0 mm x 41.4 mm Bore X Stroke Ct70: 47.0 mm x 41.4 mm Compression Ratio: Approximately 8.4:1 to 9.5:1 depending on model and year Horsepower St50: Approx. 4.5 - 5.0 HP @ 9,000 RPM Horsepower Ct70: Approx. 6.0 - 7.0 HP @ 8,500 RPM Fuel System Carburetor Type: Keihin or similar Japanese carburetor, specific models vary by year and displacement (e.g., PB6 / PB7) Fuel Type: Unleaded gasoline (octane rating typically 86 or higher) Fluid Specifications Engine Oil Type: SAE 10W-30 API SE or SF classification recommended Engine Oil Capacity: Approximately 0.8 - 1.0 Liters (refer to specific model chapter for exact quantity) 🔧 Transmission Standard Ct70 Standard Transmission: 3-speed semi-automatic (automatic clutch with foot shifter) Ct70H Standard Transmission: 4-speed manual transmission with manual clutch (lever operated) St50/St70 Transmission: Typically 2-speed or 3-speed automatic/semi-automatic (specifics vary) Optional Transmission Options: CT70H offered a manual clutch and 4-speed transmission as a distinct model from the semi-automatic CT70. Features Clutch Type: Wet multi-plate type for manual transmission; centrifugal automatic clutch for semi-automatic models. Fluid Requirements Transmission Oil: Uses engine oil (same as engine oil specification) for lubrication of gearbox and clutch assembly. 📐 Dimensions Exterior Wheelbase Ct70: Approx. 1175 mm (46.3 inches) Seat Height Ct70: Approx. 730 mm (28.7 inches) Weights Dry Weight Ct70: Approx. 70-77 kg (154-170 lbs) depending on exact model and equipment Fuel Tank Capacity: Approximately 3.2 Liters (0.85 US gal) 🛡️ Safety Features Ratings Safety Standards: Designed to meet the safety standards of its era; no modern crash test ratings apply. Active Features Braking System Design: Drum brakes front and rear, operated by cables. Effective for the vehicle's performance envelope. Passive Features Frame Construction: Steel frame construction provides structural integrity. Lighting System: Includes headlight, taillight, brake light, and turn signals (where equipped) for visibility. 💡 Technology Features Infotainment Infotainment Features: Basic instrumentation: speedometer, neutral indicator light, possibly high beam indicator. No advanced infotainment systems. Driver Assistance Driver Assistance Features: No electronic driver assistance features. Focus is on mechanical systems. Connectivity Connectivity Features: No electronic connectivity features. Simplicity is a hallmark. 🔧 Maintenance Service Intervals Oil Change Interval: Every 1,000 km (600 miles) or 6 months, whichever...