Positioning:
Designed for the off-road enthusiast and competitor, the WR250F is a high-performance dirt bike known for its agility and power.
Competitors:
Directly competes with other 250cc off-road motorcycles from manufacturers like Honda (CRF250X), Kawasaki (KLX250S), and KTM (250 EXC-F).
Features:
Lightweight chassis, potent 4-stroke engine, adjustable suspension, and off-road specific components.
Vehicle Models Covered:
Yamaha WR250F, Yamaha WR250FR
Model Years Covered:
2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009
Type:
Workshop Service Manual / Repair Manual
Engine Service:
Complete engine disassembly, assembly, overhaul, diagnostics, and tuning.
Transmission Service:
Removal, installation, disassembly, assembly, and troubleshooting of the transmission system.
Fuel System:
Carburetor systems, fuel delivery, fuel tank, and related components.
Ignition System:
Ignition timing, spark plug specifications, CDI unit, and related electrical components.
Lubrication System:
Oil pump operation, oil filter replacement, oil change procedures, and lubrication points.
Exhaust System:
Exhaust pipe, muffler, and related components.
Electrical System:
Wiring diagrams, battery, charging system, lighting, and electronic components.
Bodywork And Chassis:
Frame, body panels, seating, handlebars, and suspension components.
Braking System:
Front and rear brake system maintenance, repair, and bleeding procedures.
Cooling System:
Radiator, coolant, fan operation, and related components.
Suspension And Steering:
Front fork, rear shock absorber, linkage, and steering assembly.
Routine Maintenance:
Oil changes, filter replacements, chain adjustment, and general upkeep.
Troubleshooting:
Diagnostic procedures for identifying and resolving common and uncommon issues.
Repair And Overhaul:
Step-by-step instructions for repairing and completely rebuilding all major components.
Component Removal Installation:
Detailed instructions for removing and reinstalling various parts and assemblies.
Tune Ups:
Procedures for engine tuning, carburetor adjustments, and performance optimization.
Depth:
Comprehensive, covering everything from basic maintenance to complete engine and transmission rebuilds.
Target Audience:
Professional mechanical technicians and experienced DIY enthusiasts.
Proprietary Components:
Includes instructions for proprietary components and references manufacturer guidelines where applicable.
Type:
4-stroke, liquid-cooled, DOHC, single-cylinder
Displacement:
250cc (Specific bore and stroke may vary slightly across model years within this range, typical is around 74mm bore x 57.5mm stroke)
Compression Ratio:
Typically in the range of 10.5:1 to 12.5:1 (refer to manual for exact year-specific data)
Horsepower:
Estimated 30-35 HP at the crank (actual figures vary by year and tuning)
Torque:
Not explicitly stated, but optimized for off-road torque delivery.
Carburetor:
Mikuni (e.g., VM34SS or similar constant-velocity carburetor typical for this era)
Fuel Type:
Unleaded gasoline (typically 91 octane or higher)
Oil Type:
Yamalube 4 (or equivalent JASO MA certified 10W-40 or 20W-50 motorcycle oil)
Oil Capacity:
Approximately 1.5-1.8 liters (refer to manual for precise capacity with filter change)
Length:
Varies slightly by year, typically around 2170 mm
Width:
Varies slightly by year, typically around 820 mm
Height:
Varies slightly by year, typically around 1295 mm
Dry Weight:
Approximately 112-115 kg (dry)
Wet Weight:
Approximately 118-122 kg (wet, with all fluids)
Fuel Capacity:
Approximately 8.0 - 9.0 liters
Safety Ratings:
N/A (Motorcycle safety is primarily based on rider skill and adherence to safe operating practices, not formal crash ratings like cars).
Active Safety:
Responsive braking system, agile handling for evasive maneuvers.
Passive Safety:
No specific passive safety features like airbags or crumple zones inherent to motorcycle design.
Manual Warnings:
Manual prominently features WARNING, CAUTION, and NOTE notations for critical procedures and safety.
Infotainment System:
N/A (This is a competition off-road motorcycle, not equipped with infotainment features.)
Driver Assistance Features:
N/A (No electronic rider aids like ABS or traction control typical for this model's intended use).
Connectivity Options:
N/A
Lighting System:
Basic headlight and taillight for trail riding legality and visibility, typically using incandescent bulbs.
Oil Change Interval:
Typically every 10-20 hours of operation or seasonally, depending on riding conditions (refer to manual for exact recommendations).
Air Filter Cleaning:
Frequent cleaning recommended, especially in dusty conditions (e.g., every 5-10 hours).
Spark Plug Replacement:
Recommended at approximately 20-30 hours or as per manual inspection.
Valve Clearance Check:
Typically every 20-40 hours of operation.
Engine Oil:
Yamalube 4 (or JASO MA certified 10W-40/20W-50)
Coolant:
High-quality ethylene glycol-based coolant mixed with distilled water (50/50 ratio).
Brake Fluid:
DOT 4 or DOT 5.1 (refer to manual for specific recommendation).
Common Wear Items:
Clutch plates, piston rings, valve guides, and swingarm/linkage bearings are common wear items on high-performance off-road motorcycles.
Carburetor Tuning:
Carburetor may require re-jetting or adjustments due to altitude or modifications.
Special Tools:
Manual references specific Yamaha special tool numbers for certain adjustments and repairs, emphasizing precision.
Recommended Tool:
Torque wrench is essential for ensuring fasteners are tightened to factory specifications.
Heritage:
Yamaha has a long and successful history in motorsport, particularly in off-road racing, with a reputation for engineering excellence and reliability.
Evolution:
The WR250F series evolved from earlier Yamaha 2-stroke enduro bikes, transitioning to the 4-stroke platform to meet performance and emissions demands, with incremental updates in suspension, engine tuning, and chassis components throughout the 2000-2009 period.
Manufacturing Origin:
Primarily manufactured in Japan.
Motorsport Success:
Yamaha WR models have a history of success in various off-road racing disciplines, including enduro and motocross.
Consumer Ratings:
Generally well-regarded by riders for performance, reliability, and build quality.
Certifications:
N/A (Motorcycle certifications are typically emissions or road-legal related, not applicable to pure off-road models unless specified for dual-sport variants).
