Category:
Off-Road Competition/Dual-Sport (Supermoto Variant)
Target Audience:
Enthusiast riders, mechanics, and owners requiring in-depth knowledge for maintenance and repair.
Competitors 2008:
KTM 250 EXC, Honda CRF250X, Kawasaki KLX250S, Suzuki DR-Z250.
Engine Type:
Liquid-cooled, DOHC, four-stroke, five-valve, single-cylinder.
Frame Type:
Aluminum, bilateral beam.
Suspension Front Type:
46mm Kayaba Speed-Sensitive System (SSS) upside-down telescopic fork.
Suspension Rear Type:
Fully adjustable Kayaba Monocross single shock.
Brake System:
Hydraulic disc brakes front and rear (WR250X features street-biased tires and wheels).
Value Proposition:
Empowers owners with comprehensive, factory-level repair and maintenance knowledge for optimal performance and longevity.
Content Reliability:
Based on official Yamaha service documentation, ensuring accuracy and adherence to factory specifications.
Engine:
Complete internal and external engine service, including disassembly, inspection, repair, and reassembly of all components.
Fuel System:
Carburetor tuning, cleaning, and overhaul; fuel tank inspection and repair; fuel line maintenance.
Ignition System:
Spark plug specifications, ignition coil testing, CDI unit diagnostics, and timing adjustments.
Cooling System:
Radiator service, coolant specifications and capacity, water pump inspection and repair, thermostat operation.
Exhaust System:
Muffler and pipe inspection, gasket replacement, and exhaust mounting hardware.
Transmission:
Clutch inspection, adjustment, and replacement; gearbox disassembly and reassembly; gear ratio information.
Chassis And Frame:
Frame inspection for damage, steering head bearing maintenance, and sub-frame component service.
Suspension Front:
Fork disassembly, seal replacement, oil type and level specifications, spring rate information, and adjustability.
Suspension Rear:
Monoshock inspection, linkage service, shock absorber overhaul and adjustment, spring replacement.
Brakes Front:
Brake caliper service, pad replacement, rotor inspection and specifications, hydraulic system bleeding.
Brakes Rear:
Brake caliper service, pad replacement, rotor inspection and specifications, hydraulic system bleeding.
Wheels And Tires:
Spoke tension adjustment, rim inspection, tire pressure recommendations, and wheel bearing maintenance.
Electrical System:
Wiring diagrams, battery specifications, charging system testing, lighting system service, starter motor operation.
Bodywork And Plastics:
Panel removal and installation, decal application, and fairing repair.
Routine Maintenance:
Oil changes, filter replacements, chain lubrication and adjustment, air filter cleaning/replacement, spark plug checks, brake fluid checks.
Troubleshooting:
Diagnostic procedures for common starting issues, performance problems, electrical faults, and unusual noises.
Engine Rebuild:
Detailed instructions for piston, ring, cylinder, valve train, and crankshaft service and replacement.
Suspension Overhaul:
Step-by-step guide for replacing fork seals, shock absorber components, and linkage bearings.
Brake System Service:
Complete brake pad and rotor replacement, caliper piston service, and hydraulic system flushing and bleeding.
Carburetor Adjustment:
Detailed instructions for idle speed, main jet, pilot jet, and needle adjustments for optimal performance.
Electrical Diagnostics:
Guidance on using multimeters for testing components and tracing electrical faults using provided diagrams.
Clutch Replacement:
Service procedures for clutch plates, springs, and basket.
Depth:
Comprehensive (covering from basic maintenance to full engine and component rebuilds).
Diagnostic Capabilities:
Advanced diagnostic procedures and troubleshooting flowcharts.
Torque Specifications:
Detailed torque values for all critical fasteners and bolts.
Measurements:
Precise measurements for engine clearances, component wear limits, and tolerances.
Engine Type:
250cc Liquid-cooled, four-stroke, DOHC, 5-valve, single-cylinder.
Bore X Stroke:
77.0 mm x 53.6 mm
Compression Ratio:
12.5:1
Carburetion:
Keihin FCR39 Flatslide Carburetor with TPS (Throttle Position Sensor).
Horsepower Estimated:
Approx. 30-33 HP (at crankshaft, depending on tuning and exhaust)
Torque Estimated:
Approx. 17-19 lb-ft (at crankshaft)
Fuel Type:
Unleaded gasoline
Fuel Tank Capacity:
2.1 gallons (7.9 Liters)
Engine Oil Type:
Yamalube 4 (or equivalent) SAE 10W-40 API SG or higher.
Engine Oil Capacity:
1.10 liters (when filter is changed)
Coolant Type:
Permanent type antifreeze coolant (50% solution with distilled water).
Engine Oil Change:
Every 10 hours of operation or monthly, whichever comes first (under severe use).
Air Filter Cleaning:
Every 5 hours of operation or as needed depending on conditions.
Spark Plug Check:
Every 10 hours of operation.
Valve Clearance Check:
Every 20 hours of operation.
Chain Lubrication Adjustment:
Every 5-10 hours of operation, or as needed.
Common Wear Items:
Clutch plates, brake pads, fork seals, wheel bearings, and valve seats due to off-road use.
Carburetor Tuning Sensitivity:
Can be sensitive to altitude and temperature changes, requiring periodic fine-tuning.
Post Ride Cleaning:
Thorough cleaning after off-road use to prevent dirt ingress into bearings and mechanical parts.
