Market Segment:
Off-road/Enduro competition and recreational riding.
Competitors 2005:
KTM 250 EXC, Yamaha YZ250 (WR variant), Honda CR250R (off-road variant), Suzuki RM250 (off-road variant), Kawasaki KX250 (off-road variant).
Model Focus:
Performance-oriented 2-stroke enduro motorcycle known for its power delivery and handling.
Engine:
Complete engine disassembly, inspection, repair, and reassembly for the 2-stroke 250cc engine.
Fuel System:
Carburetor tuning, cleaning, and overhaul; fuel tank and petcock maintenance.
Cooling System:
Radiator, hoses, thermostat, and coolant replacement procedures.
Ignition System:
Spark plug specifications, ignition coil testing, CDI unit diagnostics.
Exhaust System:
Pipe and silencer maintenance, inspection for damage and leaks.
Transmission:
Gearbox disassembly, inspection, clutch operation, and lubrication.
Drivetrain:
Chain and sprocket inspection, adjustment, and replacement; rear hub maintenance.
Suspension Front:
Fork seal replacement, oil changes, spring preload adjustment, damper settings.
Suspension Rear:
Monoshock absorber servicing, linkage maintenance, spring replacement, adjustments.
Brakes Front:
Caliper overhaul, pad replacement, fluid bleeding, disc inspection.
Brakes Rear:
Caliper overhaul, pad replacement, fluid bleeding, disc inspection.
Wheels Tires:
Spoke tensioning, rim inspection, tire mounting and balancing, wheel bearing service.
Electrical System:
Wiring diagrams, lighting system diagnostics, battery maintenance, switchgear.
Frame Chassis:
Frame inspection, swingarm pivot service, steering head bearing replacement.
Bodywork:
Plastic panel removal and installation, seat maintenance, fender replacement.
Preventative Maintenance:
Regular service intervals, lubrication points, filter changes.
Troubleshooting:
Diagnostic flowcharts for common starting, running, and electrical issues.
Repair Procedures:
Step-by-step instructions for all major component repairs and overhauls.
Disassembly Reassembly:
Detailed guides for stripping down and rebuilding all vehicle systems.
Special Tools:
Identification and usage of specialized tools required for specific repairs.
Depth:
Comprehensive (OEM level) covering basic maintenance to complete engine and chassis rebuilds.
Type:
2-stroke, liquid-cooled, reed-valve inducted
Bore X Stroke:
66.4 mm x 72 mm
Compression Ratio:
8.7:1 (Nominal)
Power Output Estimated:
Approx. 35-40 HP (at crank, depending on tuning)
Torque Output Estimated:
Approx. 25-30 lb-ft (at crank)
Carburetor Model:
Keihin PWK 38 (typically)
Fuel Type:
Unleaded gasoline (91+ octane recommended) mixed with 2-stroke oil
Oil Mixture Ratio:
50:1 (Standard, refer to manual for specific oil type)
Fuel Tank Capacity:
Approx. 2.5 gallons (9.5 liters)
Type:
6-speed, constant mesh
Clutch Type:
Wet, multi-plate, cable-actuated
Gear Ratios:
Specific gear ratios are detailed within the manual, crucial for performance tuning.
Transmission Oil Type:
Refer to manual; typically a high-quality 10W/40 or 80W/90 gear oil or specific transmission fluid.
Transmission Oil Capacity:
Approx. 0.8 - 1.0 liters (refer to manual for precise capacity).
Oil Change Transmission:
Every 20-30 hours of riding, or as specified in the manual.
Air Filter Cleaning:
After every few rides or in dusty conditions; detailed cleaning procedure in manual.
Spark Plug Replacement:
Every 50-100 hours of riding, depending on usage and plug type.
Top End Rebuild:
Intervals vary greatly based on usage and maintenance, typically 100-200 hours for piston/rings. Manual provides wear limits.
Coolant Type:
Ethylene glycol-based coolant with corrosion inhibitors (e.g., 50/50 mix with distilled water).
Brake Fluid:
DOT 4 hydraulic brake fluid.
Fork Oil:
Specific viscosity (e.g., 5W or 7.5W) and level, detailed in manual.
Common Wear Items:
Clutch plates, piston rings, fork seals, wheel bearings, chain, and sprockets are typical wear items.
Carburetor Tuning:
Can be sensitive to altitude and temperature changes; requires diligent tuning.
Cooling System Maintenance:
Regular flushing and proper coolant levels are critical for the 2-stroke engine's longevity.
2 Stroke Specifics:
Requires meticulous attention to fuel/oil mixture and regular decarbonization of the exhaust port.
Brand Origin:
Husqvarna Motorcycles is one of the oldest motorcycle manufacturers in the world, originating from Sweden in 1903.
Wr Series:
The WR series has a long lineage in enduro and cross-country racing, evolving over decades to incorporate technological advancements.
Manufacturing Location:
Primarily Italy during this period, under ownership by MV Agusta and later BMW.
Model Run:
The WR 250 has been a staple in Husqvarna's lineup for many years, with continuous updates.
