Model Nickname:
XJ250 Diversion (potential sibling model, though BR designation is less common in Yamaha's broader product lines, suggesting a specific market or application)
Chassis Code:
Likely to vary by region, but common Yamaha codes for this era could be '3X5' or similar, depending on specific sub-model/market.
Engine Code:
Likely to be a variant of Yamaha's 250cc air-cooled parallel twin or single-cylinder engine from the era, specific code not provided.
Target Audience:
DIY enthusiasts, independent repair shops, and owners looking to maintain and repair their Yamaha BR250 motorcycle.
Value Proposition:
Enables significant cost savings by empowering owners to perform their own maintenance and repairs, promoting self-sufficiency and deeper understanding of the vehicle.
Manual Advantage:
Provides in-depth, professional-level information often unavailable in simpler owner's manuals, crucial for older models where dealership support may be limited.
Ease Of Use:
Designed with 'very easy to follow step-by-step instructions' for accessible repairs.
Completeness:
Covers all services and repairs, including routine maintenance, for a holistic approach to vehicle care.
Digital Convenience:
Printable pages and digital storage offer flexibility and protection of the manual's condition.
Years Covered:
1981, 1982, 1983, 1984, 1985, 1986, 1987, 1988, 1989, 1990
Page Count:
Not specified, but described as 'full professional quality in depth', suggesting a substantial page count typical of a WSM.
Manual Type:
Workshop Service Manual (WSM) / Repair Manual
Engine:
Comprehensive coverage including disassembly, inspection, repair, and assembly of engine components (e.g., cylinder head, piston, crankshaft, valves, lubrication system, cooling system if applicable).
Fuel System:
Carburetor(s) adjustment, cleaning, and overhaul; fuel pump operation and maintenance (if applicable); fuel tank and lines.
Ignition System:
Ignition timing, spark plug specifications, CDI unit, ignition coils, and related components.
Transmission:
Clutch operation, adjustment, and replacement; gearbox inspection and repair; gear shift mechanism.
Drivetrain:
Chain and sprockets inspection and replacement; rear wheel hub and bearing maintenance.
Suspension:
Front fork disassembly, maintenance, and fluid replacement; rear shock absorber inspection and replacement; linkage and bearing maintenance.
Brakes:
Front and rear brake system diagnosis, repair, and maintenance; brake fluid specifications and bleeding procedures; caliper and master cylinder overhaul.
Electrical System:
Wiring diagrams, battery maintenance, charging system (stator, rectifier/regulator), starter motor, lighting, switches, and instrumentation.
Frame And Bodywork:
Chassis inspection, steering head bearing maintenance, seat and panel removal/installation, and general body component repair.
Routine Maintenance:
Oil changes, filter replacements, chain lubrication and adjustment, tire pressure checks, brake adjustments, spark plug replacement, air filter cleaning/replacement.
Troubleshooting:
Diagnostic procedures for common running issues, electrical faults, and mechanical problems.
Engine Rebuilds:
Step-by-step instructions for complete engine disassembly, inspection of wear limits, and reassembly.
Suspension Overhaul:
Detailed instructions for servicing front forks and rear suspension components.
Brake System Service:
Bleeding, pad replacement, caliper and master cylinder overhaul.
Electrical Diagnosis:
Use of wiring diagrams for fault finding, testing components like stator and rectifier.
Depth Of Coverage:
Comprehensive, covering everything from basic maintenance to complete engine and chassis overhauls. Includes detailed specifications, tolerances, and torque values.
Diagnostic Tools:
Instructions implicitly assume basic mechanic tools. Electrical diagnostics would likely rely on multimeter usage.
Visual Aids:
Includes pictures and wiring diagrams to aid in repair and understanding.
Engine Type:
Likely a 250cc, air-cooled, 4-stroke, parallel-twin or single-cylinder engine. Specific configuration (e.g., DOHC/SOHC) not detailed but typical for Yamaha 250s of the era.
Bore X Stroke:
Specifics unavailable without model confirmation, but typical for a 250cc Yamaha would be around 50-60mm bore and 45-55mm stroke.
Compression Ratio:
Typically around 9.0:1 to 10.0:1 for this era's engines.
Horsepower:
Estimated 20-27 hp. Exact figures depend on the specific engine configuration and tuning for the BR250 model.
Torque:
Estimated 18-22 Nm. Specifics depend on engine configuration.
Carburetion:
Likely a single or dual Mikuni carburetor. Specific model designation (e.g., VM26, VM28) would be detailed in the manual.
Fuel Type:
Unleaded gasoline, likely with an octane rating of 87 or higher (RON/AKI equivalent).
Fuel Tank Capacity:
Typically around 10-14 liters for a motorcycle of this class and era.
Overall Length:
Not specified, typical for a 250cc sport/standard motorcycle of the era would be around 2000-2150 mm.
Overall Width:
Not specified, typical around 700-800 mm.
Overall Height:
Not specified, typical around 1100-1200 mm.
Dry Weight:
Likely in the range of 130-150 kg, depending on specific equipment and materials.
Wet Weight:
Not specified, but would be dry weight plus fluids and fuel.
Payload Capacity:
Not specified, but typical for a solo rider plus minimal gear.
Safety Certification:
Likely meets relevant national motorcycle safety standards for the production years.
Braking System:
Front disc brake and rear drum brake or disc brake, depending on market specification. Manual will detail performance characteristics and maintenance.
Lighting:
Headlight, taillight, brake lights, turn signals.
Frame Construction:
Steel frame, likely a diamond or cradle type, providing structural integrity.
Tires:
Tubed or tubeless tires, with specific sizes and pressure recommendations detailed in the manual.
Instrumentation:
Analog speedometer, tachometer, odometer, trip meter, and indicator lights for turn signals, high beam, neutral, and oil pressure (if applicable).
Rider Aids:
No electronic rider aids like ABS or traction control would be present on this model from this era.
Connectivity Features:
No modern connectivity features like Bluetooth or USB ports.
Oil Change Interval:
Typically every 3,000-6,000 km or 6-12 months, depending on usage. Manual will specify exact interval and oil type.
Valve Clearance Check:
Intervals vary, but often around 6,000-12,000 km. Manual provides exact checks and adjustment procedures.
Chain Maintenance:
Lubrication and tension checks every 500-1000 km, or more frequently in adverse conditions.
Engine Oil Type:
Yamaha recommends specific grades, likely SAE 10W-40 or 20W-50 API SE, SF, or SG quality oil. Manual will confirm.
Engine Oil Capacity:
Typically around 1.5-2.0 liters without filter change, and slightly more with. Manual will provide exact figures.
Brake Fluid Type:
DOT 3 or DOT 4 hydraulic fluid. Manual will specify for optimal performance and safety.
Fork Oil Type:
Yamaha's recommended fork oil grade (e.g., 10W) or equivalent. Manual will detail viscosity and quantity.
Common Wear Items:
Cam chain tensioners (can become noisy), clutch wear, carburetor jetting issues due to age/ethanol fuel, fork seals, and electrical connections due to corrosion.
Ignition Reliability:
CDI units and stators can degrade over time, leading to spark issues. Manual guides testing procedures.
Yamaha Legacy:
Yamaha's long history in motorcycle manufacturing, known for innovation, reliability, and performance across various segments.
Br250 Context:
The BR250 likely falls into Yamaha's range of mid-capacity motorcycles from the early to late 1980s, often characterized by sporty styling and reliable performance for daily commuting or light sport riding. It could be a predecessor or variant of models like the Diversion or XJ series.
Production Period:
Manufactured across the 1981-1990 model years, indicating a relatively stable platform during that decade.
