🏷️ Basic Information

Make:

Yamaha

Model:

BR250

Year:

1987

Vin Prefix:

Typically starts with 'JY' for Japanese manufacture, specific prefixes may vary slightly by region and production plant for Yamaha motorcycles.

👋 Introduction

Segment:

The Yamaha BR250 (likely referring to a variation of the XS250 or a specific custom model) would have occupied the lightweight to middleweight performance or custom motorcycle segment of its era.

Competitors 1987:

Competed against models from Honda (CB series), Kawasaki (KZ series), Suzuki (GS series), and other manufacturers in the 250cc class, often appealing to riders seeking a balance of performance and manageable power, or a platform for customization.

Design Philosophy:

Yamaha's reputation for reliable engines and innovative design would have been a key selling point.

Target Audience:

Primarily professional technicians, but with sufficient detail for serious home mechanics.

Value Proposition:

Enables in-depth understanding and execution of all maintenance and repair tasks, preserving the performance and longevity of the vintage motorcycle.

📋 Manual Details

Primary Coverage:

Complete repair and service information for the Yamaha BR250 motorcycle.

Secondary Coverage:

Diagnostic procedures, electrical schematics, routine maintenance, and troubleshooting guidance.

Estimated Pages:

Approximately 300-450 pages (typical for comprehensive service manuals of this era).

Type:

Factory Service Manual (FSM) / Repair Manual

Language:

English

Format:

PDF (Downloadable)

📖 Manual Coverage

Engine Mechanical:

Complete engine overhaul, cylinder head, piston, crankshaft, connecting rods, valve train, timing.

Fuel System:

Carburetor service, fuel pump, fuel tank, fuel lines, fuel filters.

Ignition System:

Ignition coil, spark plugs, CDI unit, timing adjustments.

Exhaust System:

Muffler, exhaust pipes, gaskets.

Cooling System:

Radiator (if applicable), coolant hoses, thermostat, water pump.

Transmission:

Gearbox overhaul, clutch service, shift mechanism, transmission oil.

Drivetrain:

Final drive (chain or shaft), sprockets, chain maintenance and adjustment.

Suspension:

Front fork service, rear shock absorber, swingarm, bushings.

Brakes:

Front and rear brake systems, hydraulic lines, master cylinders, calipers, brake pads, brake fluid specifications.

Electrical System:

Wiring diagrams, battery service, charging system (stator, regulator/rectifier), lighting, starter motor, switches.

Chassis Frame:

Frame inspection, steering head bearings, wheel bearings.

Bodywork Fittings:

Fairings, seat, fuel tank mounting, fenders.

Routine Maintenance:

Oil changes, filter replacements, chain lubrication, brake adjustments, spark plug checks.

Troubleshooting:

Diagnostic charts for common problems, symptom-based fault finding.

Engine Rebuild:

Step-by-step instructions for complete engine disassembly, inspection, repair, and reassembly.

Carburetor Tuning:

Detailed procedures for cleaning, adjusting, and synchronizing carburetors.

Electrical Diagnostics:

Testing of electrical components, circuit tracing using wiring diagrams.

Suspension Overhaul:

Fork seal replacement, shock absorber service, linkage maintenance.

Brake System Repair:

Bleeding procedures, caliper rebuilding, master cylinder replacement.

Torque Specifications:

Precise torque values for all critical fasteners.

Depth:

Comprehensive from basic maintenance to full engine and component rebuilding, suitable for professional technicians and experienced DIYers.

Diagnostic Capabilities:

Detailed diagnostic flowcharts and troubleshooting guides for identifying and resolving mechanical and electrical issues.

📊 Manual Specifications

Format:

Digital PDF

Searchability:

Likely searchable text for quick information retrieval.

Quality:

High-resolution scans for clear diagrams and text, printable.

Type:

N/A (Digital Download)

Type:

N/A (Digital Download)

⚙️ Engine Specifications

Configuration:

Likely a parallel-twin cylinder, 4-stroke engine, common for Yamaha 250cc models of this period.

Displacement:

Approximately 249cc (exact may vary depending on specific BR250 variant).

Bore X Stroke:

Specifications would be detailed in the manual, typically around 54.0 mm x 54.0 mm or similar for a 250cc parallel twin.

Compression Ratio:

Likely in the range of 8.5:1 to 9.5:1.

Valve Train:

DOHC (Double Overhead Camshaft) or SOHC (Single Overhead Camshaft) with 2 valves per cylinder.

Horsepower Estimated:

Around 25-30 HP at 8,000-9,000 RPM.

Torque Estimated:

Around 16-18 lb-ft at 6,000-7,000 RPM.

Carburetion:

Dual Mikuni constant velocity (CV) carburetors (e.g., VM26 or similar).

Fuel Type:

Unleaded gasoline, octane rating as specified by Yamaha.

Oil Capacity:

Approximately 1.4 - 1.8 liters (including oil filter).

Oil Type Specification:

Yamalube 4-stroke motorcycle oil, SAE 10W-40 or 20W-40 depending on climate. Manual will specify exact viscosity and API service classification.

🔧 Transmission

Type:

Constant mesh, 6-speed sequential manual transmission.

Availability:

N/A (Motorcycles typically have a single transmission offering for a model).

Clutch:

Wet, multiple-disc clutch, cable operated.

Final Drive:

Chain drive.

Transmission Oil:

Gear oil as specified by Yamaha, typically SAE 80W or 90W gear oil. Manual will specify exact type and capacity.

📐 Dimensions

Overall Length Estimated:

Approximately 2000-2100 mm.

Overall Width Estimated:

Approximately 750-850 mm.

Overall Height Estimated:

Approximately 1100-1200 mm.

Dry Weight Estimated:

Approximately 150-170 kg.

Wet Weight Estimated:

Approximately 165-185 kg (including fluids).

Fuel Tank Capacity:

Typically 10-14 liters.

🛡️ Safety Features

Crash Test Results:

N/A (Motorcycles are not subjected to the same standardized crash testing as automobiles).

Braking System:

Hydraulic disc brakes front and rear (or drum rear on some variants). Manual details proper maintenance for optimal braking performance.

Lighting:

Headlight, taillight, brake light, turn signals, and license plate light. Manual covers bulb replacement and electrical troubleshooting.

Chassis Integrity:

Frame and suspension components are critical for stable handling and rider safety. Manual provides guidance on inspection and maintenance.

💡 Technology Features

System:

N/A (This era of motorcycle did not feature infotainment systems in the modern sense. Focus is on mechanical and electrical functionality).

Features:

N/A

Features:

N/A

System:

Points ignition (or early electronic ignition) and mechanical carburetor controls are the primary 'technology'.

🔧 Maintenance

Oil Change:

Typically every 3,000-5,000 km or 6-12 months, whichever comes first. Manual will specify.

Valve Adjustment:

Every 10,000-15,000 km or as per manual recommendations, critical for engine performance.

Chain Lubrication:

Every 500-1000 km and after washing or riding in rain.

Brake Fluid Change:

Every 2 years or as recommended by Yamaha.

Coolant:

Ethylene glycol-based antifreeze mixed with distilled water (50/50 ratio), if liquid-cooled. Manual will specify coolant type and capacity.

Brake Fluid:

DOT 3 or DOT 4 hydraulic brake fluid, depending on Yamaha's specification for the brake system.

Carburetor Gumming:

Common in older bikes due to fuel degradation; requires thorough cleaning and adjustment.

Electrical Connections:

Corrosion or looseness in connectors can lead to intermittent issues, especially after long periods of disuse.

Suspension Seals:

Fork seals can degrade over time, leading to leaks.

Exhaust Flaking:

Rust or flaking paint on exhaust components.

📚 Vehicle History

Yamaha Motorcycles:

Yamaha Motor Company, founded in 1955, has a rich history in motorcycle manufacturing, known for innovation, racing success, and reliable performance across various categories.

250Cc Class:

The 250cc class was a highly competitive segment throughout the 1970s and 1980s, with models like the XS250 serving as foundational platforms that evolved with technology and styling trends. The 'BR250' designation might represent a specific sub-model, custom variant, or regional market model within the broader 250cc line-up.

Manufacturing Location:

Primarily manufactured in Japan.

🏆 Awards & Recognition

Model Specific:

Specific awards for the BR250 model are not widely documented in general automotive historical records, but Yamaha's 250cc line-up was generally well-regarded for performance and reliability in its class.

Manual Quality:

The manual's value is in its factory-originated data, ensuring accuracy and comprehensiveness for repairs.