Category:
Performance Off-Road Motorcycle
Intended Use:
Cross-country, enduro, and trail riding
Key Competitors:
KTM 250 EXC, Honda CRF250X, Suzuki RMX250, Kawasaki KX250F
Engine Configuration:
Liquid-cooled, DOHC, four-stroke, single-cylinder
Performance Orientation:
Designed for off-road performance with strong low-to-mid range torque
Suspension Type:
Advanced adjustable suspension for varied terrain
Manual Utility:
Essential for owners and mechanics requiring genuine replacement parts and correct identification
Engine Components:
Cylinder head, cylinder, piston, crankshaft, camshaft, valves, carburetor, ignition system components
Transmission Components:
Gearbox, clutch assembly, shift drum, shift forks, drive sprockets
Chassis Components:
Frame, sub-frame, swingarm, suspension (forks and rear shock), steering head assembly
Fuel System Components:
Fuel tank, fuel pump, fuel lines, carburetor jets and internal components
Cooling System Components:
Radiator, water pump, hoses, thermostat
Electrical Components:
Wiring harness, lighting, battery, starter motor, CDI unit, stator
Braking System Components:
Front and rear brake calipers, master cylinders, brake lines, brake discs, brake pads
Wheel And Tire Components:
Rims, spokes, hubs, axles, wheel bearings
Exhaust System Components:
Exhaust header pipe, muffler, mounting hardware
Control Components:
Handlebars, levers, cables, footpegs, shifter assembly
Part Identification:
Comprehensive identification of all genuine Yamaha parts with part numbers
Disassembly Reference:
Exploded diagrams illustrating part relationships for disassembly
Assembly Reference:
Exploded diagrams guiding re-assembly procedures
Quantity Indication:
Specifies the quantity of each part required for assembly
Remark Notation:
Includes remarks or notes for specific parts or procedures
Depth:
Component-level identification and sourcing
Focus:
Parts cataloguing for repair and maintenance, not diagnostic procedures
Engine Type:
Liquid-cooled, 4-stroke, DOHC, 5-valve, Single Cylinder
Displacement:
249 cc (Cubic Centimeters)
Bore X Stroke:
74.0 mm x 58.0 mm (approximate)
Compression Ratio:
12.5:1 (typical for this generation)
Horsepower:
Approximately 30-35 HP (at crankshaft, estimated)
Torque:
Approximately 18-20 lb-ft (at crankshaft, estimated)
Fuel Delivery:
Keihin FCR carburetor (specific model may vary, e.g., FCR33)
Ignition System:
Digital CDI
Oil Type:
Yamalube 4-stroke motorcycle oil or equivalent SAE 10W-40 or 20W-50 API SG
Oil Capacity:
Approx. 1.2 L (with oil filter change)
Length:
Approx. 2170 mm (85.4 in)
Width:
Approx. 815 mm (32.1 in)
Height:
Approx. 1260 mm (49.6 in)
Wheelbase:
Approx. 1475 mm (58.1 in)
Ground Clearance:
Approx. 325 mm (12.8 in)
Dry Weight:
Approx. 107 kg (236 lbs)
Wet Weight:
Approx. 115 kg (254 lbs) (with fluids, estimated)
Fuel Tank Capacity:
Approx. 8.0 Liters (2.1 Gallons)
Oil Change Interval:
Every 10-15 hours of riding or annually, whichever comes first.
Air Filter Cleaning:
Every 5-10 hours of riding, depending on conditions.
Spark Plug Inspection:
Every 10-15 hours of riding.
Valve Clearance Check:
Every 20-30 hours of riding (critical for performance).
Engine Oil:
Yamalube 4-stroke motorcycle oil or equivalent SAE 10W-40 API SG
Coolant:
Permanent type antifreeze coolant, mixed with distilled water at a 50/50 ratio
Brake Fluid:
DOT 4 hydraulic brake fluid
Clutch Fluid:
DOT 4 hydraulic clutch fluid (if hydraulic clutch, typical for WR models)
Carburetor Tuning:
May require jetting adjustments for different altitudes or temperatures. FCR carburetors can be sensitive.
Valve Tightening:
Valve clearances can tighten over time, requiring periodic adjustment to maintain optimal performance and prevent damage.
Cooling System Maintenance:
Regular coolant flushes and checking for leaks in hoses and radiator are important.
Yamaha Offroad Legacy:
Yamaha has a long-standing reputation for producing high-performance off-road motorcycles, particularly in motocross and enduro categories.
Wr250F Development:
The WR series is Yamaha's enduro-focused line, derived from their successful YZ motocross models, adapted for off-road legal use and extended-range capabilities.
Model Generation:
The 2003 model represents an important iteration in the early development of the WR250F, building on the success of its predecessors and incorporating Yamaha's innovative technologies.
