Vehicle Segment:
Competition Enduro Motorcycle
Target Audience:
Off-road enthusiasts, racers, recreational riders seeking performance and durability.
Key Competitors:
KTM EXC series, Honda CR250R (enduro conversion), Suzuki RM-E, Kawasaki KX-E (enduro conversion).
Engine Type:
Two-stroke, single-cylinder, liquid-cooled engine, known for its strong power delivery.
Suspension Performance:
Advanced suspension for off-road capability, featuring adjustable components.
Off Road Durability:
Built with robust components for the rigors of off-road riding.
Engine Service:
Complete engine overhaul, top-end rebuild, bottom-end assembly, valve clearance, timing, carburetor tuning, ignition system, cooling system (if applicable).
Transmission Service:
Gearbox disassembly and assembly, clutch service, shift mechanism, lubrication.
Chassis Service:
Frame inspection, suspension (forks, rear shock), steering, wheel bearings, swingarm.
Electrical System:
Wiring diagrams, lighting, ignition, charging system, switches, battery maintenance.
Braking System:
Front and rear brake caliper service, master cylinder overhaul, brake fluid replacement, pad replacement, cable adjustment (if drum brakes).
Fuel System:
Fuel tank inspection, fuel lines, fuel pump (if applicable), carburetor cleaning and adjustment, jetting information.
Exhaust System:
Exhaust pipe inspection and replacement, silencer packing (if applicable).
Cooling System:
Radiator, hoses, coolant, fan (if applicable).
Routine Maintenance:
Oil changes, filter replacement, chain adjustment, spark plug replacement, air filter cleaning/replacement, general inspection points.
Troubleshooting Guides:
Diagnostic procedures for common performance issues, starting problems, electrical faults.
Rebuild Procedures:
Detailed step-by-step instructions for engine, transmission, and suspension component overhauls.
Technical Specifications:
Torque values, clearances, fluid capacities, engine timing, ignition timing.
Wiring Diagrams:
Comprehensive electrical schematics for easy diagnosis and repair.
Special Tool Requirements:
Identification of proprietary Yamaha tools needed for specific tasks.
Diagnostic Capability:
Advanced diagnostics for mechanical and electrical systems.
Repair Complexity:
Covers from basic adjustments to complete engine and component rebuilds.
Information Detail:
Highly detailed, factory-level information suitable for professional technicians and experienced DIYers.
Engine Type:
2-stroke, single-cylinder, liquid-cooled, Reed Valve Induction
Displacement:
239cc (approximate, specific bore/stroke for 1993 model)
Bore X Stroke:
72.0 x 58.0 mm (typical for this engine family)
Compression Ratio:
Approximately 7.0-7.5:1 (typical for 2-stroke enduro)
Carburetor:
Mikuni VM36 (or similar 36mm flat-slide carburetor)
Horsepower:
Estimated 40-45 HP (at crankshaft)
Torque:
Estimated 25-28 lb-ft
Fuel Type:
Unleaded gasoline, 87-92 octane rating (specified in manual)
Oil Mixture:
Pre-mix at 50:1 ratio (Yamalube 2-stroke oil recommended, or equivalent).
Transmission Type:
6-speed constant mesh manual transmission
Optional Transmissions:
N/A (Standard on all WR250 models of this generation)
Clutch Type:
Wet, multi-plate, manual clutch
Gear Ratios:
Specific ratios for each gear are detailed in the manual.
Final Drive:
Chain drive (O-ring seal type recommended)
Overall Length:
Refer to manual for precise measurements, typically around 80-85 inches.
Overall Width:
Refer to manual for precise measurements, typically around 30-33 inches.
Overall Height:
Refer to manual for precise measurements, typically around 50-52 inches (seat height).
Dry Weight:
Approximately 230-245 lbs (dry weight, unladen).
Fuel Capacity:
Approximately 2.5 - 3.0 gallons (refer to manual for exact).
Oil Capacity:
Transmission oil capacity: Approx. 0.8-1.0 liters (refer to manual for exact).
Safety Ratings:
N/A (Motorcycles are not subject to automotive crash safety ratings in the same way.)
Braking System Type:
Hydraulic disc brakes front and rear.
Suspension Type:
Upside-down (USD) front forks, Monocross rear suspension with adjustable shock absorber for enhanced control and stability.
Lighting System:
Headlight, taillight, brake light for visibility.
Chassis Design:
Sturdy frame designed for off-road handling and rider safety.
Engine Oil Change:
Every 1,000-1,500 miles or annually. Detailed schedule in manual.
Air Filter Cleaning:
After every few rides or as needed based on conditions (refer to manual).
Chain Lubrication Adjustment:
Every 500 miles or after washing/wet riding. Detailed adjustment procedure in manual.
Spark Plug Replacement:
Every 2,000-3,000 miles or as per manual recommendation.
Top End Rebuild:
Typically every 6,000-10,000 miles for performance-oriented 2-strokes, but highly dependent on riding style and conditions (manual will provide guidelines).
Engine Oil:
Yamalube 2-stroke oil or API TC/JASO FD certified synthetic 2-stroke oil (for pre-mix). Transmission oil: SAE 10W-30 API GL-4 (specific viscosity and standard in manual).
Coolant:
Permanent type antifreeze coolant, 50% solution in distilled water.
Brake Fluid:
DOT 3 or DOT 4 hydraulic brake fluid (refer to manual for exact).
Common Wear Items:
Clutch plates, piston rings, carburetor jets, fork seals, wheel bearings, chain and sprockets.
Carburetor Tuning:
Can be sensitive to altitude and temperature changes; proper jetting is crucial for optimal performance and longevity.
Power Valve Maintenance:
The exhaust power valve system requires periodic cleaning to prevent sticking and maintain performance.
Yamaha Motorcycle Legacy:
Yamaha has a long-standing reputation for performance-oriented motorcycles, particularly in off-road racing and competition.
Wr250 Development:
The WR series was developed from Yamaha's highly successful YZ motocross lineage, adapting them for wider off-road use and competition (enduro, trail riding).
Comparison To Yz:
The WR250 was typically equipped with features for street legality (lights, larger fuel tank, sometimes electric start in later models) and wider gear ratios compared to the YZ models.
Production Years:
The WR250 nameplate has been used across various engine displacements (250cc, 450cc, etc.) and engine types (2-stroke, 4-stroke) over the years. The 1993 model represents a specific 2-stroke iteration.
Manufacturing Location:
Japan (primarily)
Off Road Performance Awards:
While specific awards for the 1993 WR250 might not be widely documented in consumer reviews, Yamaha's WR series consistently received praise in motorcycle magazines for its performance and handling in its class.
Magazine Reviews:
Generally reviewed positively for its potent two-stroke engine, capable suspension, and competitive off-road prowess.
Certification Standards:
N/A (Not applicable in the typical sense).
