Target Audience:
Owners, mechanics, and restorers of 1978 Yamaha XS650E and XS650SE models
Value Proposition:
Provides essential, official factory information for maintaining, repairing, and restoring the iconic Yamaha XS650 series
Information Source:
Official Factory Service Manual, considered the definitive source for technical data
Comprehensiveness:
Covers all aspects of the motorcycle's operation, maintenance, and repair
Detail Level:
Includes detailed diagrams, specifications, and step-by-step procedures
Primary Coverage:
Full Factory Service and Repair
Vehicle Models Covered:
Yamaha XS650E, Yamaha XS650SE
Model Years Covered:
1978
Estimated Pages:
Hundreds (specific count not provided, but described as 'COMPLETE official full factory service repair manual')
Type:
Workshop Service Repair Manual
Language:
English (presumed based on product description)
Engine:
Complete overhaul, tuning, diagnostics, lubrication, cooling system, fuel system, ignition system, exhaust system
Transmission:
Gearbox operation, maintenance, overhaul, clutch service, shift mechanism
Drivetrain:
Final drive, chain maintenance, sprocket replacement, shaft drive (if applicable to specific model variants)
Chassis:
Frame inspection and repair, suspension (front forks, rear shocks), steering system, wheel bearings
Brakes:
Front and rear brake system maintenance, caliper overhaul, fluid replacement, pad/shoe inspection and replacement, hydraulic lines
Electrical System:
Wiring diagrams, battery maintenance, charging system (alternator/generator), lighting, ignition coil, starter motor, fuses, switches
Fuel System:
Carburetor identification, tuning, cleaning, rebuilding (e.g., Mikuni VM series), fuel tank maintenance, fuel lines
Bodywork:
Fender removal/installation, seat maintenance, tank mounting, control lever adjustments, minor panel repair
Maintenance:
Regular servicing, oil changes, filter replacements, chain adjustments, brake checks, tire pressure checks, spark plug replacement
Diagnostics:
Troubleshooting guides for common performance issues, electrical faults, and mechanical problems
Repair:
Step-by-step instructions for component disassembly, repair, and reassembly for all major systems
Rebuilds:
Detailed procedures for engine top-end and bottom-end rebuilds, gearbox overhauls, and carburetor rebuilding
Adjustments:
Valve clearance adjustment, carburetor synchronization, ignition timing adjustment, clutch and throttle cable adjustments
Depth:
Comprehensive from basic rider maintenance to full engine rebuilds and advanced diagnostics, suitable for professional mechanics and experienced DIY enthusiasts
Searchable Text:
Presumed searchable text within the PDF for ease of navigation and information retrieval
Printability:
Designed to be fully printable, allowing users to print specific sections or the entire manual
Binding Options:
N/A (Digital PDF download, user can choose binding upon printing)
Paper Recommendation:
N/A (Digital PDF download, user can choose paper type upon printing)
Engine Type:
Air-cooled, four-stroke, parallel-twin
Displacement:
653 cc (40.0 cu in)
Bore X Stroke:
75.0 mm x 74.0 mm (2.95 in x 2.91 in)
Valve Configuration:
SOHC, 2 valves per cylinder
Ignition System:
CDI (Capacitor Discharge Ignition) with electronic advance
Lubrication System:
Wet sump
Horsepower Peak:
Approx. 53 hp @ 6500 rpm (Model dependent, this is a typical figure for the era)
Torque Peak:
Approx. 37 ft-lbs @ 5000 rpm (Model dependent, this is a typical figure for the era)
Carburetors:
Dual Mikuni VM34SC (or similar 34mm constant velocity carburetors)
Fuel Capacity:
Approx. 3.7 US gallons (14 liters)
Fuel Type:
Unleaded gasoline (with appropriate octane rating for the era, typically 87 or 89 octane)
Transmission Type:
5-speed constant mesh
Clutch:
Wet, multiple disc
Gear Ratios:
Specific ratios will be detailed in the manual (e.g., 1st: 2.35, 2nd: 1.64, 3rd: 1.27, 4th: 1.04, 5th: 0.87)
Transmission Oil:
Yamaha motorcycle gear oil or equivalent (specific viscosity and API classification in manual, likely SAE 80W-90 GL-4)
Overall Length:
Approx. 87.6 inches (2225 mm) - Varies slightly between E and SE models
Overall Width:
Approx. 34.1 inches (865 mm) - Varies slightly between E and SE models
Overall Height:
Approx. 46.7 inches (1185 mm) - Varies slightly between E and SE models
Wheelbase:
Approx. 58.7 inches (1490 mm)
Dry Weight:
Approx. 460 lbs (209 kg) - Varies slightly between E and SE models
Gross Vehicle Weight Rating:
Not typically specified for motorcycles, but load capacity details will be in manual
Crash Test Results:
N/A (Motorcycle safety ratings not standardized in the same way as cars)
Braking System:
Front: Disc brake; Rear: Drum brake (specific caliper/drum sizes in manual)
Lighting:
Headlight, taillight, brake light, turn signals
Frame Construction:
Steel double-cradle frame
Oil Change Interval:
Every 2,000 miles or 6 months (refer to manual for precise interval based on usage)
Valve Adjustment Interval:
Every 4,000 miles or 12 months
Chain Lubrication Interval:
Every 500 miles or after riding in wet conditions
Engine Oil Type:
Yamalube 4 (or equivalent API SF/SG or higher, SAE 10W-40 or 20W-40, depending on climate)
Engine Oil Capacity:
Approx. 2.7 US quarts (2.5 liters) with filter change
Brake Fluid Type:
DOT 3 or DOT 4 (refer to manual for specific recommendations)
Charging System:
Early models could experience issues with the stock charging system (rectifier/regulator). Manual will guide diagnosis.
Oil Leaks:
Common leak points include valve cover gaskets, crankcase seals, and oil filter housing. Manual provides seal replacement procedures.
Carburetor Sync:
Carburetors require regular synchronization for smooth running. Manual covers synchronization procedures.
Cam Chain Tensioner:
The cam chain tensioner can wear over time, leading to noise. Manual outlines inspection and adjustment/replacement.
Yamaha Motor Corporation:
Founded in 1887 as a musical instrument manufacturer, Yamaha entered the motorcycle market in 1955.
Xs650 Lineage:
The XS650 was Yamaha's flagship large-displacement motorcycle introduced in 1970, directly competing with British twins. The E and SE models represent refinements and styling variations from earlier iterations.
Xs650Se Special:
The 'SE' designation typically indicates a 'Special' or custom styling package, often featuring unique paint, chrome, spoked wheels, and sometimes different handlebars or seating compared to the standard 'E' model.
Production Period:
1970-1983 (XS650 range), with 1978 models being a key year in its development.
Manufacturing Location:
Japan
Model Legacy:
The XS650 is widely regarded as a classic motorcycle, celebrated for its reliable parallel-twin engine and customizability. It's a popular platform for cafe racers and vintage restorations.
Reliability Reputation:
Generally considered reliable and robust when properly maintained, a hallmark of its design.
Manual Authenticity:
Official Factory Service Manual, providing authorized procedures and specifications.
