Description:
The Yamaha BR250F was part of Yamaha's lineup of street motorcycles, often positioned as a reliable and accessible machine for commuting and general riding. This manual serves essential support for owners and mechanics maintaining these bikes.
Competitors:
Competed with similar displacement motorcycles from manufacturers like Honda (e.g., CB250 series), Kawasaki (e.g., GPz250), and Suzuki (e.g., GS250).
Manual Focus:
Emphasis on practical repair procedures, detailed diagrams, and troubleshooting guides crucial for keeping older motorcycles in optimal running condition.
Engine And Powertrain:
Engine disassembly, assembly, tuning, lubrication, cooling system, fuel system (carburetor diagnosis and adjustment), exhaust system, ignition system, starting system, charging system.
Chassis And Suspension:
Front fork (dismantling, reassembly, oil changes), rear shock absorber (replacement, adjustment), swingarm, steering system, wheel bearings, frame inspection.
Brakes:
Front and rear brake systems (hydraulic components, caliper maintenance, brake fluid replacement, bleeding procedures, pad and shoe replacement).
Electrical System:
Wiring diagrams, lighting system, instrumentation, horn, battery maintenance, troubleshooting electrical faults, component testing.
Body And Cosmetics:
Panel removal and installation, seat, fuel tank, fenders, fairings (if applicable).
Maintenance:
Scheduled maintenance, oil changes, filter replacements, spark plug checks, chain adjustment, brake adjustments, lubrication points.
Troubleshooting:
Diagnostic charts for common problems, fault finding procedures based on symptoms.
Repair And Overhaul:
Step-by-step instructions for component removal, disassembly, cleaning, inspection, repair, and reassembly.
Depth:
Designed for professional technicians, offering in-depth mechanical and electrical repair information. Covers complete engine rebuilds, transmission servicing, and advanced electrical diagnostics.
Engine Type:
Air-cooled, 4-stroke, parallel-twin (typical for this model, exact configuration to be confirmed by manual content).
Displacement:
Approximately 249cc (250 class).
Horsepower:
Estimated 25-30 HP (typical for the era and displacement).
Torque:
Estimated 18-22 lb-ft (typical).
Fuel Delivery:
Dual Carburetors (likely Mikuni VM series or similar, specific model number will be in the manual).
Carburetor Details:
Manual will detail jetting, float height, needle settings, and synchronization procedures.
Oil Type:
API SE, SF, or SG classification motorcycle oil, SAE 10W-40 or 20W-50 (refer to manual for exact specification).
Oil Capacity:
Approx. 1.4-1.8 Liters without filter change, 1.6-2.0 Liters with filter change (refer to manual for exact capacity and filter part number).
Ignition System:
CDI (Capacitor Discharge Ignition).
Spark Plugs:
NGK DPR8EA-9 or similar (verify with manual for exact part number and gap).
Crash Test Results:
N/A (Motorcycle specific safety ratings are not standardized like automobiles).
Braking System:
Front disc brake, rear drum brake (typical for the era and model).
Lighting:
Headlight, taillight, brake light, turn signals.
Oil Change:
Every 3,000-5,000 km or 6 months (typical for motorcycles of this era; refer to manual for precise interval).
Chain Lubrication And Adjustment:
Every 500-1,000 km or after riding in wet conditions.
Valve Clearance Check:
Every 10,000-15,000 km (crucial for engine longevity and performance).
Brake Fluid:
DOT 3 or DOT 4 (refer to manual for exact specification and replacement interval).
Fork Oil:
Yamaha Genuine Fork Oil (e.g., 10W) or equivalent, specific quantity and level detailed in manual.
Carburetor Clogging:
Common in older motorcycles due to fuel degradation; requires periodic cleaning and synchronization. Manual provides detailed procedures.
Electrical Connections:
Corrosion or loosening of electrical connectors can lead to intermittent faults. Manual's wiring diagrams are vital for diagnosis.
Suspension Wear:
Seals in front forks and rear shock absorbers can degrade over time, leading to leaks and reduced damping. Manual details seal replacement.
Yamaha Motorcycles:
Yamaha Motor Company has a long-standing reputation for producing high-quality motorcycles across various categories, known for performance, reliability, and innovation since its inception in the 1950s.
Br Series:
The BR series was part of Yamaha's efforts to capture the growing market for stylish and functional sportbikes or naked bikes of smaller displacement, offering a balance of performance and economy.
Production Period:
The BR250F was likely produced for a limited period in the late 1980s. Specific production start/end dates would require further research or confirmation from official Yamaha archives.
