This manual covers the 1979 Yamaha XS650SF, a variant of the iconic XS650 line that debuted in 1970. Known for its characterful parallel-twin engine, the XS650 series represented Yamaha's entry into large-displacement motorcycles, offering a blend of British twin aesthetics with reliable Japanese engineering. The XS650SF, or Special, variant specifically catered to the custom and cruiser market with distinctive styling. This particular model, identified by chassis code XS650SF and engine code 650-2F, features a 653 cc air-cooled parallel-twin engine with overhead valve configuration, dual Mikuni carburetors, and a 5-speed transmission, delivering approximately 50-53 horsepower.
This comprehensive Workshop Service Repair Manual in English provides detailed, step-by-step instructions for the maintenance, diagnostics, and repair of all major mechanical, electrical, and structural systems of the 1979 Yamaha XS650SF. It includes extensive coverage of the fuel system, engine top end, clutch, lubrication system, crankshaft, transmission, wheels, tires, brakes, suspension, steering, frame, and the complete electrical system, supported by hundreds of photos and illustrations. The manual is designed to assist both do-it-yourself enthusiasts and professional mechanics in keeping the motorcycle in optimal working condition, offering troubleshooting guides and critical safety information.
Target Audience:
Do-it-yourself enthusiasts and professional mechanics seeking comprehensive repair and maintenance guidance.
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.
General Information:
Included
Engine Lubrication System:
Included
Engine Removal Installation:
Included
Crankshaft Transmission:
Included
Electrical System:
Included
Estimated Pages:
Hundreds of pages (specific count not provided, but indicative of a comprehensive manual)
Type:
Workshop Service Repair Manual
All Systems:
Covers all major mechanical, electrical, and structural systems of the motorcycle.
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.
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.
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.
Compatibility:
Compatible with all PC-based Windows operating systems and Mac.
Printability:
Printable without any restriction, either entire manual or specific pages.
Delivery:
Digital download, link provided on checkout page after payment.
Software Requirement:
Adobe PDF Reader
Binding:
N/A (Digital PDF download)
Paper Quality:
N/A (Digital PDF download)
Configuration:
Parallel-Twin (Vertical Twin)
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)
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)
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)
Type:
5-speed constant mesh
Drive System:
O-ring sealed chain drive
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)
Transmission Oil Capacity:
Approx. 2.0 Liters (for gearbox and primary drive, specific amount for lubrication and final drive covered in manual)
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)
Features:
N/A (This is a vintage motorcycle from 1979, infotainment systems were not standard features.)
Features:
N/A (Driver assistance systems were not present on motorcycles of this era.)
Features:
N/A (No electronic connectivity features.)
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)
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)
Engine Oil Capacity:
Approx. 2.0 Liters (without filter change), Approx. 2.3 Liters (with filter change) (Typical, specific values in manual)
Charging System:
Stator coil failure or regulator/rectifier issues are common on older models.
Carburetor Sync:
Carburetors often require periodic synchronization for smooth running.
Kick Starter Mechanism:
Wear in the kick-starter mechanism can lead to slipping or failure to engage.
Oil Leaks:
Gaskets and seals can degrade over time, leading to oil leaks, particularly around the engine cases.
Yamaha Motorcycles:
Yamaha Motor Company, established in 1955, has a long history of producing high-quality motorcycles known for their performance and reliability.
Xs650 Lineage:
The XS650 series, introduced in 1970, was Yamaha's first large-displacement motorcycle, featuring a characterful parallel-twin engine that mimicked British twins but with Japanese engineering. The SF designation typically indicates a 'Special' or 'Custom' variant, often with different styling, wheels, and suspension compared to the standard model.
Xs650 Special Variants:
The XS650 Special line (including models like XS650SF) was introduced to cater to the growing cruiser and custom market, featuring chopper-style handlebars, longer front forks, and distinctive styling cues.
Xs650 Production Years:
1970-1983
