Segment:
Dual-sport motorcycle, often categorized within the off-road or supermoto segment.
Target Audience:
Enthusiasts seeking a capable off-road machine with street-legal capabilities (WR250R) or a more aggressive street-focused supermoto (WR250X).
Competitors:
Kawasaki KLX250, Honda CRF250L/RL, Suzuki DR-Z250, and potentially some 300-400cc class dual-sports.
Versatility:
The WR250R is renowned for its dual-purpose capability, transitioning between trails and street use.
Performance Engine:
The liquid-cooled, DOHC, 4-valve, single-cylinder engine offers a good balance of power and reliability.
Suspension Quality:
Premium suspension components (e.g., KYB) contribute to excellent handling on various terrains.
Build Quality:
Yamaha's reputation for robust build quality and reliability.
Engine:
Detailed engine disassembly, assembly, component overhaul, tuning, and diagnostics.
Fuel System:
Fuel injection system (EFI), fuel pump, injectors, fuel pressure regulator, throttle body, fuel tank, and lines.
Ignition System:
Ignition coil, spark plug, ECU control, timing, and troubleshooting.
Cooling System:
Radiator, fan, thermostat, water pump, coolant flow, and flushing procedures.
Exhaust System:
Muffler, catalytic converter (if applicable), exhaust headers, gaskets, and O2 sensor replacement.
Transmission:
Clutch operation, gear selection, internal transmission components, lubrication, and adjustment.
Suspension Front:
Front fork disassembly, assembly, oil change, seal replacement, spring rates, and adjustments (compression, rebound).
Suspension Rear:
Rear shock absorber overhaul, linkage system lubrication and inspection, swingarm maintenance.
Brakes Front:
Brake caliper service, pad replacement, rotor inspection, brake line bleeding, master cylinder overhaul.
Brakes Rear:
Rear brake caliper, pad, rotor service, and bleeding procedures.
Electrical System:
Battery, charging system (stator, rectifier/regulator), starter motor, lighting (headlight, taillight, indicators), wiring diagrams, fuses, relays.
Cooling Fans:
Electric cooling fan operation, troubleshooting, and replacement.
Bodywork:
Fairing removal and installation, seat, fuel tank cover, fenders, and other body panels.
Wheels Tires:
Wheel bearing replacement, spoke tensioning (if applicable), tire mounting and balancing, recommended tire pressures.
Controls:
Handlebar, levers (clutch, brake), throttle control, footpegs, and shifter adjustment.
Routine Maintenance:
Oil changes, filter replacements, chain adjustments, air filter cleaning/replacement.
Troubleshooting Diagnostics:
Step-by-step diagnostic charts for common and uncommon problems, error code interpretation.
Component Overhaul:
Complete engine rebuild procedures, including piston, rings, valves, camshaft, crankshaft, and cylinder head.
Calibration Adjustment:
Throttle position sensor (TPS) calibration, idle speed adjustment, clutch lever free play adjustment.
Wiring Diagrams:
Detailed electrical schematics for all systems.
Torque Specifications:
Precise torque values for all critical fasteners and bolts.
Special Tools:
Identification and usage of specialized tools required for specific procedures.
Depth:
Complete factory service manual, covering everything from basic maintenance to full engine and transmission rebuilds.
Diagnostic Level:
Advanced diagnostic procedures for electronic and mechanical systems.
Rebuild Scope:
Comprehensive component rebuilding, including engine internals, gearbox, and suspension units.
Engine Type:
Liquid-cooled, 4-stroke, DOHC, 4-valve, single-cylinder
Displacement:
250cc (250cc class)
Bore X Stroke:
Specific dimensions detailed in the manual (e.g., approximately 77.0 mm x 53.6 mm).
Compression Ratio:
Typically around 11.8:1 or higher.
Horsepower:
Approx. 26-30 HP (Varies slightly by model year and specific tuning).
Torque:
Approx. 17-19 lb-ft (Varies slightly).
Fuel Delivery:
Electronic Fuel Injection (EFI) with dual injectors.
Throttle Body Size:
Typically 42mm throttle body.
Fuel Type:
Unleaded gasoline, minimum 87 octane.
Oil Type:
Yamalube 4 (or equivalent) 10W-40 semi-synthetic or full synthetic motorcycle oil.
Oil Capacity:
Specific capacity with/without filter change detailed in manual (e.g., approx. 1.5L).
Length:
Specific dimensions provided in the manual (e.g., WR250R approx. 85.6 in).
Width:
Specific dimensions provided in the manual (e.g., WR250R approx. 32.3 in).
Height:
Specific dimensions provided in the manual (e.g., WR250R approx. 47.4 in).
Wheelbase:
Specific wheelbase provided in the manual (e.g., WR250R approx. 56.7 in).
Ground Clearance:
Significant ground clearance for off-road use, specific values in manual (e.g., WR250R approx. 13.1 in).
Seat Height:
High seat height typical of dual-sport/dirt bikes, specific value in manual (e.g., WR250R approx. 36.7 in).
Dry Weight:
Specific dry weight in manual (e.g., WR250R approx. 276 lbs / 125 kg).
Wet Weight:
Specific wet weight (with all fluids) in manual.
Fuel Capacity:
Specific fuel tank capacity in manual (e.g., WR250R approx. 2.0 gal / 7.6 L).
Engine Oil Change:
Recommended every 3,000-4,000 miles or annually, or more frequently for aggressive off-road use. Manual provides precise intervals.
Oil Filter Replacement:
Typically recommended with every oil change.
Air Filter Cleaning:
Frequent cleaning/replacement recommended, especially after dusty off-road riding. Manual specifies intervals.
Chain Adjustment Lubrication:
Regularly inspect and adjust chain slack, lubricate frequently. Manual details checks and intervals.
Spark Plug Inspection:
Check/replace at specific mileage intervals outlined in the manual.
Coolant Flush:
Recommended every 2 years or specific mileage, detailed in manual.
Engine Oil:
Yamalube 4 (or equivalent) 10W-40 (semi-synthetic or full synthetic).
Coolant:
Yamaha's recommended liquid-cooled coolant (e.g., Yamaha's Super Coolant) or a high-quality ethylene glycol-based coolant with a 50/50 mix.
Brake Fluid:
DOT 4 brake fluid.
Fork Oil:
Specific viscosity and quantity required, detailed in the manual (e.g., Showa SS-04 or similar).
Fuel Pump Reliability:
Some owners have reported occasional fuel pump issues, though generally reliable. Manual will cover diagnostics.
Clutch Lever Adjustment:
Regular checks for proper clutch free play are important for longevity.
Throttle Cable Wear:
Standard wear item, manual will detail adjustment and replacement.
Suspension Seals:
Fork seal leaks can occur with hard use; manual provides detailed replacement procedures.
Chain And Sprockets:
Wear items that require regular inspection and replacement based on mileage and riding conditions.
Heritage:
Yamaha has a long and successful history in off-road and competition motorcycling, known for performance and durability.
Development:
The WR250R/X replaced earlier WR250 models and introduced modern technology like fuel injection and improved chassis design.
Wr250R:
The 'R' designation signifies the dual-sport variant, designed for both off-road and street use.
Wr250X:
The 'X' designation signifies the supermoto variant, featuring smaller wheels, street tires, and a more street-focused suspension setup.
Production Years:
The WR250R/X were produced for a significant period, roughly from 2008 until around 2020, with minor updates.
Manufacturing Location:
Primarily manufactured in Japan.
