Category:
Specialty Motorcycle Service Manual
Target Audience:
Yamaha BR250 owners, independent motorcycle repair shops, hobbyists, and restorers.
Value Proposition:
Provides in-depth technical knowledge essential for maintaining, repairing, and restoring the 1987 Yamaha BR250, offering significant cost savings over dealership service.
Completeness:
Covers all aspects of the vehicle, from routine maintenance to complete engine rebuilds, making it an indispensable resource.
Accuracy:
Based on official Yamaha service data, ensuring accuracy and reliability of procedures and specifications.
Systems Covered:
Engine, Transmission, Fuel System, Ignition System, Cooling System, Exhaust System, Frame, Suspension (Front & Rear), Brakes (Front & Rear), Electrical System, Wiring Diagrams, Bodywork, Lubrication, Troubleshooting, Maintenance, Specifications, Torque Values, Special Tools
Type:
Full Service and Repair Manual
Engine Overhaul:
Complete engine disassembly, inspection, repair, and reassembly procedures for all internal components.
Transmission Service:
Clutch operation, gearbox inspection, gear shifting mechanisms, and lubrication.
Fuel And Carburetion:
Carburetor adjustment, cleaning, rebuilding, fuel pump operation, and fuel tank maintenance.
Ignition System:
CDI unit testing, spark plug specifications, ignition timing adjustment, and related components.
Electrical System:
Battery, charging system (stator, rectifier/regulator), lighting, horn, starter motor, and comprehensive wiring diagrams.
Suspension And Steering:
Front fork service (oil change, seal replacement), rear shock absorber adjustment, steering head bearing maintenance, and linkage lubrication.
Braking System:
Brake pad inspection and replacement, brake fluid flush and bleeding, caliper service, and brake lever/pedal adjustment.
Frame And Bodywork:
Frame inspection for damage, fairing removal and installation, seat maintenance, and general body panel repairs.
Routine Maintenance:
Oil changes, filter replacements, chain adjustment, brake checks, tire pressure checks, and general lubrication points.
Troubleshooting:
Diagnostic charts and procedures for common starting, running, and electrical issues.
Rebuilding Procedures:
Detailed step-by-step instructions for rebuilding the engine, transmission, and carburetor.
Technical Specifications:
Engine timing, valve clearances, carburetor settings, torque specifications for all fasteners, fluid capacities, and electrical resistance values.
Depth:
Comprehensive, from basic maintenance to complete engine and transmission rebuilds, including electrical system diagnostics.
Quality:
High-resolution, searchable PDF with clear text and legible diagrams.
Features:
Bookmark navigation for quick access to sections, zoom capabilities for detailed inspection of diagrams.
Printability:
Printable on standard home or office printers for physical copy creation.
Digital Binding:
N/A (Digital PDF)
Digital Paper:
N/A (Digital PDF)
Engine Type:
Four-stroke, Single-cylinder, DOHC
Displacement:
249 cc (15.2 cu. in.)
Bore X Stroke:
70.0 mm x 64.0 mm (2.76 in x 2.52 in)
Compression Ratio:
9.0:1 (Typical)
Horsepower:
Approximately 22-24 HP @ 8000 RPM
Torque:
Approximately 19-20 Nm @ 6500 RPM
Carburetor:
Mikuni BS34 (or similar single CV carb)
Fuel Type:
Unleaded gasoline (91 octane or higher recommended)
Fuel Tank Capacity:
Approx. 10-12 Liters (2.6-3.2 US gal)
Cooling Method:
Air-cooled
Oil Type:
SAE 20W-40 API SE or SF (refer to manual for exact specification)
Oil Capacity:
Approx. 1.4-1.6 Liters (with filter change)
Safety Standards:
Met all applicable safety standards for motorcycles in its class and era.
Braking Performance:
Adequate stopping power for its class, with disc front and drum rear configuration.
Lighting System:
Headlight, taillight, brake lights, and turn signals for visibility.
Instrumentation:
Analog speedometer, tachometer, odometer, trip meter, and indicator lights (turn signals, neutral, high beam, oil pressure).
Bluetooth Usb:
Not equipped.
Engine Oil Change:
Every 3,000 km (1,860 miles) or 6 months, whichever comes first.
Oil Filter Replacement:
Every 6,000 km (3,720 miles) or 12 months, concurrent with oil changes.
Air Filter Cleaning:
Every 3,000 km (1,860 miles); replacement as needed.
Spark Plug Inspection:
Every 6,000 km (3,720 miles); replacement as needed.
Chain Lubrication Adjustment:
Every 1,000 km (620 miles) or after washing/riding in wet conditions.
Valve Clearance Check:
Every 12,000 km (7,440 miles).
Engine Oil Specification:
SAE 20W-40 API SE or SF (refer to manual for precise formulation).
Brake Fluid Type:
DOT 3 or DOT 4 (depending on original specification, manual will clarify).
Fork Oil Type:
Yamaha Fork Oil G10 (or equivalent SAE 10W, refer to manual for precise viscosity and quantity).
Carburetor Fouling:
Common issue with older motorcycles; requires periodic cleaning and adjustment. Manual provides detailed rebuild instructions.
Electrical Connections:
Corrosion and loosening of electrical connectors can lead to intermittent faults. Manual's wiring diagrams are crucial for diagnosis.
Suspension Seals:
Front fork seals may degrade over time, leading to leaks. Manual details replacement procedures.
Yamaha Legacy:
Yamaha Motor Corporation has a rich history in motorcycle manufacturing, known for innovation and performance in various segments, including off-road and dual-sport motorcycles.
Br Series Context:
The BR series often represented Yamaha's entry into the dual-sport or enduro segment, offering versatility for both on-road and light off-road use.
Production Period:
The Yamaha BR250 was produced through the late 1980s and into the early 1990s, with variations and updates across different model years and markets.
Manufacturing Location:
Primarily manufactured in Japan.
