🏷️ Basic Information Identification Make: Yamaha Model: XS650SF Model Variant: XS650-2F Year: 1979 Codes Model Code: XS650SF / XS650-2F 👋 Introduction Market Position Target Audience: Do-it-yourself enthusiasts and experienced mechanics seeking comprehensive repair information. Competitive Analysis Format Advantage: Digital PDF offers cost-effectiveness and convenience over older paper manuals. Key Features Comprehensiveness: Complete official full factory service repair manual, covering all styles of the specified model. Cost Savings: Inexpensive way to maintain vehicle, significantly cheaper than professional mechanic labor costs. Usability: Step-by-step instructions, easy to navigate, can print specific pages for workshop use. Access Method: Speed download, no expiry dates, accessible on multiple devices. 📋 Manual Details Coverage Areas Primary Coverage: Complete Service and Repair for Yamaha XS650SF XS650-2F 1979 Page Count Estimated Pages: Hundreds Manual Type Type: Factory Service Repair Manual / Workshop Manual Language Language: English Format Format: PDF 📖 Manual Coverage Systems Covered Engine Systems: General Information, Fuel System, Cooling System, Engine Top End, Engine Lubrication System, Crankshaft/Transmission Drivetrain Systems: Clutch, Crankshaft/Transmission, Wheels/Tires, Final Drive Chassis Systems: Brakes, Suspension, Steering, Frame Electrical Systems: Electrical System Additional Sections: Appendix Procedures Included Diagnostic Procedures: Troubleshooting, Fault Diagnosis (implied by step-by-step instructions) Repair Procedures: Complete disassembly and reassembly of all covered systems and components. Maintenance Procedures: Standard maintenance tasks, preventative maintenance, routine servicing. Installation Procedures: Engine Removal/Installation Technical Depth Depth: Comprehensive, factory-level detail suitable for DIY and experienced mechanics. Visual Aids: Hundreds of photos and illustrations. 📊 Manual Specifications File Format File Type: PDF Searchability: Implied by PDF format, likely text-searchable. Print Quality Printability: Printable in its entirety or select pages. Binding Type Binding: N/A (Digital PDF format) Paper Type Paper Type: N/A (Digital PDF format) Software Requirements Reader: Adobe PDF Reader (Free) Decompression Tool: Winzip (Free) Compatibility Operating Systems: All Versions of Windows, Mac Devices: Desktop PCs, Laptops, Smartphones, Tablets, Web Browsers ⚙️ Engine Specifications Primary Engine Engine Type: Parallel-Twin, Four-stroke Displacement: 653 cc (39.8 cu in) Bore X Stroke: 73.5 mm x 77.0 mm (2.89 in x 3.03 in) Compression Ratio: 8.4:1 (typical for this era XS650) Valve Train: OHC (Overhead Camshaft), 2 valves per cylinder Ignition System: CDI (Capacitor Discharge Ignition) Performance Horsepower Est: Approx. 50-53 hp @ 6,200 rpm (specifications vary slightly by year/tuning) Torque Est: Approx. 42-44 lb-ft @ 5,000 rpm Fuel System Carburetors: Dual Mikuni VM34SS (2x 34mm Constant Velocity carburetors) Fuel Type: Unleaded gasoline (recommend 87-89 octane) Fuel Tank Capacity: Approx. 16 liters (4.2 US gallons) 🔧 Transmission Standard Type: 5-speed constant mesh Clutch Type: Wet, multi-plate Features Final Drive: Chain drive Transmission Oil Spec: Yamalube 4 (or SAE 20W-40 API SE, SF) 📐 Dimensions Exterior Overall Length: Approx. 2,235 mm (88.0 in) Overall Width: Approx. 800 mm (31.5 in) Overall Height: Approx. 1,165 mm (45.9 in) Weights Dry Weight: Approx. 196 kg (432 lbs) Wet Weight: Approx. 210 kg (463 lbs) 🛡️ Safety Features Ratings Crash Safety: N/A (Motorcycle, no standardized car crash ratings apply) Active Features Braking System: Front: Disc brake, Rear: Drum brake Passive Features Lighting: Headlight, Taillight, Turn Signals, Brake Light 💡 Technology Features Infotainment Features: Analog speedometer, tachometer, indicator lights for turn signals, oil pressure, neutral. Driver Assistance Features: N/A (Motorcycle from 1979, no electronic driver aids) Connectivity Features: N/A (Motorcycle from 1979, no connectivity features) 🔧 Maintenance Service Intervals Oil Change Interval: Every 3,000-5,000 km (1,800-3,000 miles) or annually, whichever comes first (refer to manual for precise interval). Valve Clearance Check: Every 6,000-10,000 km (3,700-6,200 miles) (refer to manual for precise interval). Spark Plug Replacement: Check at 6,000 km (3,700 miles), replace as needed. Fluid Specifications Engine Oil Viscosity: SAE 20W-40, API SE/SF or equivalent. Engine Oil Capacity: Approx. 2.4 liters (2.5 US quarts) with filter change. Brake Fluid Type: DOT 3 or DOT 4 (refer to manual for specific recommendation). Known Issues Common Wear Items: Cam chain tensioner, petcock seals, clutch plates, electrical connections, fork seals. Typical Performance Degradation: Carburetor synchronization issues, aging electrical components leading to starting problems or intermittent faults, oil leaks. Technical Specs Tire Pressure Front: 28 psi (rider only), 32 psi (rider and passenger) - refer to manual for exact specification. Tire Pressure Rear: 32 psi (rider only), 36 psi (rider and passenger) - refer to manual for exact specification. Wheel Bolt Pattern: N/A (Spoked wheels with axle nuts) 📚 Vehicle History Brand Heritage Manufacturer Origin: Yamaha Motor Company, Japan. Model Evolution Xs Series Context: The XS650 was Yamaha's first large-displacement four-stroke motorcycle, building a reputation for reliability and a classic British twin sound. 1979 Updates: The 'SF' designation often indicates styling or minor mechanical updates from previous years. Specific 1979 updates would be detailed within the manual. Production Production Years: 1970-1985 (though specific variants like the SF model may have shorter runs) 🏆 Awards & Recognition Recognitions Model Legacy: The XS650 is considered a classic motorcycle and is highly regarded in the...