Vehicle Class:
Lightweight dual-sport or street motorcycle, typical for its era
Competitors:
Competed against similar displacement models from Honda (e.g., XL250), Kawasaki (e.g., KL250), and Suzuki (e.g., DR250) in the mid-1980s
Features:
Simplicity, reliability, off-road capability, fuel efficiency, user-friendly design for its time
Benefit To Owner:
Enables owners to perform routine maintenance, complex repairs, and diagnostics themselves, saving on labor costs and prolonging the life of the motorcycle
Systems Covered:
Engine, Chassis, Electrical System, Fuel System, Lubrication System, Cooling System, Transmission, Suspension, Brakes, Frame, Bodywork, Troubleshooting, Maintenance Procedures, Specifications
Pages:
Estimated 200-300 pages (typical for a comprehensive service manual of this era)
Type:
Full Service Repair Manual
Engine:
Detailed overhaul procedures, cylinder head, piston, crankshaft, valve timing, carburetor tuning, ignition system, exhaust system
Transmission:
Gearbox disassembly, assembly, clutch operation, shift mechanism, lubrication
Electrical System:
Wiring diagrams, lighting, ignition coil, stator, battery, starter motor, charging system, troubleshooting electrical faults
Suspension And Brakes:
Front fork service, rear shock absorber maintenance, brake caliper overhaul, brake pad replacement, hydraulic system bleeding
Maintenance:
Oil changes, filter replacement, spark plug service, chain adjustment, lubrication points, periodic checks
Repair:
Component-level repair, replacement of worn or damaged parts, engine rebuild, carburetor overhaul
Troubleshooting:
Diagnostic procedures for common problems, identification of symptoms, systematic fault finding
Depth:
Comprehensive from basic maintenance to full engine and transmission rebuilds, including detailed torque specifications and clearances
Displacement:
250cc (approximate)
Configuration:
Single-cylinder, 4-stroke
Cooling:
Likely Air-Cooled
Horsepower:
Estimated 20-25 HP (typical for a 250cc air-cooled single of the era)
Torque:
Specific figures not provided, but designed for usable low to mid-range torque
Carburetion:
Single carburetor (likely Mikuni or Keihin, specific model covered in manual)
Fuel Type:
Unleaded gasoline
Type:
CDI (Capacitor Discharge Ignition)
Safety Standards:
Adheres to general motorcycle safety standards of the era; no specific crash test ratings available for motorcycles of this vintage.
Brakes:
Front disc brake, Rear drum brake (typical for 1983 models)
Lighting:
Headlight, taillight, turn signals, brake light
Oil Change:
Every 3,000 km or 6 months (typical recommendation, refer to manual for exact interval)
Spark Plug Check:
Every 6,000 km or 12 months
Valve Clearance Check:
Every 12,000 km or 24 months
Engine Oil:
Yamalube 10W-40 or equivalent motorcycle-specific oil (API SG or higher, Jaso MA)
Brake Fluid:
DOT 3 or DOT 4 hydraulic brake fluid
Transmission Oil:
Refer to engine oil specification (often shared for simplicity on smaller bikes)
Common Wear Items:
Carburetor gumming due to fuel degradation, fork seal leaks, worn chain and sprockets, aging electrical connectors, potential CDI unit failure
Carburetor Issues:
Requires regular cleaning and adjustment, especially if the bike sits for extended periods
Electrical Issues:
Corroded connections, failing regulator/rectifier, weak charging system due to stator wear
Yamaha Legacy:
Yamaha has a long-standing reputation for building reliable and performance-oriented motorcycles across various categories, from street bikes to off-road and racing machines.
Br250 Context:
The BR250 likely represented Yamaha's offering in the competitive 250cc dual-sport segment during the early 1980s, known for its versatility in both on-road and light off-road use.
Manufacturing Era:
Produced in the early to mid-1980s. This manual specifically covers the 1983 model year.
