🏷️ Basic Information Identification Make: Yamaha Model: XS650SF Model Variant: XS650-2F Year: 1979 Codes Chassis Code: XS650SF Engine Code: 650-2F 👋 Introduction Market Position Target Audience: Do-it-yourself enthusiasts and professional mechanics seeking comprehensive repair and maintenance guidance. Key Features Value Proposition: Inexpensive way to keep the vehicle working properly by providing expert-level repair and service information. Convenience: Instant download, printable pages, no shipping costs or waiting time for physical delivery. 📋 Manual Details Coverage Areas General Information: Included Fuel System: Included Cooling System: Included Engine Top End: Included Clutch: Included Engine Lubrication System: Included Engine Removal Installation: Included Crankshaft Transmission: Included Wheels Tires: Included Final Drive: Included Brakes: Included Suspension: Included Steering: Included Frame: Included Electrical System: Included Appendix: Included Page Count Estimated Pages: Hundreds of pages (specific count not provided, but indicative of a comprehensive manual) Manual Type Type: Workshop Service Repair Manual Language Language: English Format File Format: PDF 📖 Manual Coverage Systems Covered All Systems: Covers all major mechanical, electrical, and structural systems of the motorcycle. Procedures Included Maintenance And Repair: Detailed step-by-step instructions for maintenance, diagnostics, and repair procedures. Troubleshooting: Includes troubleshooting guides and procedures for diagnosing and resolving common and uncommon issues. Disassembly Assembly: Covers complete disassembly and reassembly of the motorcycle and its components. Electrical System Repair: Includes comprehensive procedures for diagnosing and repairing the entire electrical system, from battery and charging components to lighting, ignition, and starting circuits, supported by detailed wiring diagrams. Technical Depth Depth: Comprehensive, suitable for both do-it-yourself owners and experienced mechanics. Accuracy And Completeness: This manual is presented as the COMPLETE official full factory service repair manual, ensuring a high degree of accuracy and completeness for all repair and maintenance tasks. Illustrations And Diagrams Visual Aids: Hundreds of photos, illustrations, drawings, and enlarged insets for detailed part identification and procedure guidance. Technical Information Notes Cautions Warnings: Includes critical notes, cautions, and warnings throughout each chapter to pinpoint important information. Electrical Diagrams: Detailed wiring diagrams integrated with troubleshooting and electrical service procedures. 📊 Manual Specifications File Format Compatibility: Compatible with all PC-based Windows operating systems and Mac. Print Quality Printability: Printable without any restriction, either entire manual or specific pages. Delivery Method Delivery: Digital download, link provided on checkout page after payment. Requirements Software Requirement: Adobe PDF Reader Binding Type Binding: N/A (Digital PDF download) Paper Type Paper Quality: N/A (Digital PDF download) ⚙️ Engine Specifications Primary Engine Configuration: Parallel-Twin (Vertical Twin) Displacement: 653 cc Bore X Stroke: 73.0 mm x 77.5 mm (Typical for XS650, specific for 1979 model confirmed in manual) Compression Ratio: 8.2:1 (Typical for XS650, specific for 1979 model confirmed in manual) Valve Train: Overhead Valve (OHV), pushrod actuated with two valves per cylinder (one intake, one exhaust). Ignition System: CDI (Capacitor Discharge Ignition) with dual spark plugs per cylinder for improved combustion. (Details on ignition timing and components in manual) Performance Horsepower: Approx. 50-53 HP (Estimated, actual figure varies by tuning and specific model year, details in manual) Torque: Approx. 36-38 lb-ft (Estimated, actual figure varies by tuning and specific model year, details in manual) Fuel System Carburetion: Dual Mikuni VM34SC Carburetors (Typical for XS650SF, details in manual) Fuel Capacity: 17 Liters (4.5 US gal) (Typical for XS650, details in manual) Cooling System Method: Air-cooled 🔧 Transmission Standard Type: 5-speed constant mesh Features Drive System: O-ring sealed chain drive Fluid Specifications Transmission Oil Type: Yamalube 4 (or equivalent API SE, SF, SG, SH, SJ, SK, SL, SM, SN, SO) SAE 20W-40 or SAE 10W-40 (refer to manual for exact specifications) Fluid Capacities Transmission Oil Capacity: Approx. 2.0 Liters (for gearbox and primary drive, specific amount for lubrication and final drive covered in manual) 📐 Dimensions Weights Dry Weight: Approx. 195 kg (430 lbs) (Typical for XS650 Special, details in manual) Wet Weight: Approx. 209 kg (460 lbs) (Typical for XS650 Special, details in manual) 💡 Technology Features Infotainment Features: N/A (This is a vintage motorcycle from 1979, infotainment systems were not standard features.) Driver Assistance Features: N/A (Driver assistance systems were not present on motorcycles of this era.) Connectivity Features: N/A (No electronic connectivity features.) 🔧 Maintenance Service Intervals Oil Change: Every 3,000 km or 6 months (Typical, specific intervals for engine oil and transmission oil detailed in manual) Valve Adjustment: Every 6,000 km (Typical, specific interval and procedure detailed in manual) Chain Lubrication Adjustment: Every 1,000 km or as needed (Typical, detailed in manual) Fluid Specifications Engine Oil Type: Yamalube 4 (or equivalent API SE, SF, SG, SH, SJ, SK, SL, SM, SN, SO) SAE 20W-40 or SAE 10W-40 (refer to manual for exact specifications and capacities) Fluid Capacities Engine Oil Capacity: Approx. 2.0 Liters (without filter change), Approx. 2.3 Liters (with filter change) (Typical, specific values in manual) Known Issues Charging System: Stator coil failure or regulator/rectifier issues are common on older models....