Positioning:
The Yamaha BR250 was positioned as a capable entry-level to mid-range cruiser motorcycle, appealing to riders seeking reliable performance and classic styling.
Competitors 1986:
Competed against models from Honda (e.g., Shadow series), Kawasaki (e.g., Vulcan series), and Suzuki (e.g., Intruder series).
Engine Type:
V-twin engine, known for its characteristic rumble and accessible power delivery.
Styling:
Classic cruiser aesthetics with comfortable ergonomics for relaxed riding.
Accessibility:
Designed to be user-friendly for both new and experienced riders, with a focus on ease of maintenance.
Primary Focus:
Comprehensive Service and Repair for the Yamaha BR250 (1986 Model Year)
Secondary Focus:
Maintenance, Troubleshooting, Rebuilding, Refurbishing, Restoration
Estimated Pages:
Likely 300-500+ pages (typical for a full service manual covering all aspects)
Type:
Full Service Repair Manual
Engine Mechanical:
Full disassembly, inspection, repair, and reassembly of engine components (cylinder head, pistons, crankshaft, camshafts, valves, etc.)
Fuel System:
Carburetor tuning, cleaning, and overhaul; fuel pump operation; fuel lines and filter replacement
Ignition System:
CDI unit, spark plugs, ignition coils, wiring diagrams, timing adjustments
Transmission:
Clutch operation and adjustment, gear shifting mechanisms, transmission oil change and checks
Electrical System:
Wiring diagrams, battery maintenance, charging system (stator, regulator/rectifier), lighting, starting system, switches, sensors
Chassis And Suspension:
Front fork service, rear shock absorber maintenance, wheel bearing inspection and replacement, steering system service
Braking System:
Brake pad replacement, caliper service, brake fluid bleeding and replacement, master cylinder inspection
Cooling System:
Radiator, hoses, thermostat, coolant specifications and flush procedures (if applicable, though BR250 is likely air-cooled)
Exhaust System:
Muffler and pipe inspection, gasket replacement
Bodywork And Trim:
Panel removal and installation, seat, fuel tank, fenders, minor cosmetic repairs
Scheduled Maintenance:
Oil changes, filter replacements, chain lubrication and adjustment, spark plug checks, general inspection points
Troubleshooting:
Diagnostic charts and symptom-based problem solving for common issues
Repair Procedures:
Step-by-step instructions for component replacement and repair
Rebuild Instructions:
Detailed guidance for engine and transmission rebuilds
Adjustment Procedures:
Carburetor synchronization, ignition timing, clutch and brake lever free play
Torquing Specifications:
Precise torque values for all critical fasteners
Depth:
Comprehensive, from basic tune-ups to complete engine and transmission overhauls, including electrical diagnostics.
Engine Type:
Air-cooled, 4-stroke, SOHC, V-twin
Displacement:
248 cc (approx.)
Bore X Stroke:
Specific dimensions would be detailed in the manual, but typically around 49.0 mm x 66.0 mm for a 250cc V-twin of this era.
Compression Ratio:
Detailed in manual, likely around 9.0:1 to 10.0:1.
Horsepower:
Estimated 20-25 HP (peak), specific figure in manual.
Torque:
Estimated 15-20 lb-ft (peak), specific figure in manual.
Carburetion:
Dual carburetors (e.g., Mikuni VM26 or similar), specific model in manual.
Fuel Tank Capacity:
Approx. 10-12 liters (specific capacity in manual).
Ignition:
Transistor Controlled Ignition (TCI) or CDI system.
Overall Length:
Refer to manual for exact dimensions, typically around 2200-2300 mm.
Overall Width:
Refer to manual for exact dimensions, typically around 800-850 mm.
Overall Height:
Refer to manual for exact dimensions, typically around 1150-1200 mm.
Dry Weight:
Approx. 155-165 kg (specific weight in manual).
Curb Weight:
Approx. 170-180 kg (with fluids, specific weight in manual).
Max Load Capacity:
Refer to manual for exact rider and cargo weight limits.
Front Tire Size:
Likely 3.00-18 or 3.50-18 (specific size in manual).
Rear Tire Size:
Likely 130/90-15 or similar cruiser fitment (specific size in manual).
Front Wheel Type:
Spoked or cast aluminum wheel, likely 18-inch diameter.
Rear Wheel Type:
Spoked or cast aluminum wheel, likely 15-inch diameter.
Safety Standards:
Manufactured to meet 1986 Japanese domestic market and relevant export market safety regulations.
Braking System:
Hydraulic front disc brake, mechanical rear drum brake (common for this model and era).
Lighting:
Headlight, tail light, brake light, turn signals.
Features:
Basic analog instrumentation: speedometer, tachometer (if equipped), odometer, trip meter, neutral indicator, turn signal indicators, oil pressure light.
Features:
No electronic rider aids typically found on this model. Focus is on mechanical engagement.
Engine Oil Change:
Every 3,000-5,000 km or 6-12 months (refer to manual for exact interval).
Spark Plug Check:
Every 6,000-10,000 km or annually.
Chain Lubrication:
Every 500-800 km and after riding in wet conditions.
Valve Clearance Check:
Every 10,000-15,000 km (critical for engine health).
Engine Oil Type:
Yamalube 10W-40 or equivalent API SG, JASO MA certified motorcycle oil.
Engine Oil Capacity:
Approximately 1.8-2.2 liters (check dipstick or sight glass).
Brake Fluid Type:
DOT 3 or DOT 4 (refer to manual for specific recommendation).
Common Wear Items:
Carburetor jets/needles (clogging), fork seals (leaking), clutch plates (slipping with high mileage), electrical connectors (corrosion).
Carburetor Performance:
Can be prone to fuel gumming if left to sit; requires regular cleaning and synchronization for optimal performance.
Electrical Reliability:
Older bikes can experience issues with rectifier/regulator failure or wiring harness degradation; manual is crucial for diagnosis.
Heritage:
Yamaha has a long-standing reputation for building reliable and performance-oriented motorcycles across various segments.
Lineage:
The BR250 likely fits into Yamaha's cruiser line that evolved from earlier custom-styled models, paving the way for more specialized cruiser designs.
Production Years:
The BR250 was produced for a specific period in the mid-to-late 1980s, with 1986 being a key model year.
