Years Covered:
2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008
Model Code:
WR426F (Internal Yamaha codes may vary by region and specific sub-model)
Target Audience:
Owners and technicians of Yamaha WR426F motorcycles from 2000-2008 requiring detailed repair and maintenance information.
Value Proposition:
Provides professional-level repair and maintenance data, enabling users to perform extensive work on their WR426F, saving on dealership service costs and facilitating restoration projects.
Manual Advantages:
Instant download, printable pages, detailed step-by-step instructions, troubleshooting guides, comprehensive wiring diagrams.
Coverage Scope:
Full Service Repair, Maintenance, Diagnostics, Restoration, Rebuilding
Estimated Page Count:
Detailed, likely exceeding 500 pages (typical for full service manuals)
Manual Type:
Full Service Repair Manual
Engine Systems:
Engine disassembly, assembly, lubrication, cooling, fuel system (carburetion), ignition system, exhaust system, engine management (if applicable for the era)
Transmission Systems:
Clutch, gearbox, shifting mechanisms, final drive
Chassis Systems:
Frame, suspension (front forks, rear shock absorber), steering, wheels, brakes (front and rear), chain drive
Electrical Systems:
Ignition system, lighting, charging system (stator/CDI), wiring diagrams, troubleshooting electrical faults
Bodywork And Controls:
Body panels, seat, handlebars, controls, footpegs, levers
Maintenance Procedures:
Regular servicing, oil changes, filter replacements, chain lubrication and adjustment, spark plug maintenance, valve clearance checks
Repair Procedures:
Detailed step-by-step instructions for component removal, installation, and repair across all major systems
Diagnostic Procedures:
Troubleshooting common problems, identifying causes of malfunctions, diagnostic flowcharts
Rebuild Procedures:
Complete engine rebuilds, gearbox overhauls, suspension component refurbishment
Electrical Troubleshooting:
Diagnosis and repair of electrical circuits, wiring harness issues, component testing
Depth Of Information:
Comprehensive, suitable for professional technicians and experienced DIY mechanics. Covers basic maintenance to complete engine and transmission rebuilds.
Engine Type:
4-Stroke, Liquid-cooled, DOHC, Single-cylinder
Displacement:
426cc (Approximately)
Bore X Stroke:
Specific dimensions to be found in the manual (e.g., 95.0 mm x 78.0 mm or similar for the 426cc class)
Horsepower:
Not explicitly stated in product info, but typically in the range of 45-55 HP for this class of dirt bike.
Torque:
Not explicitly stated in product info, but typically in the range of 35-40 lb-ft for this class of dirt bike.
Carburetor Type:
Typically a Mikuni flat-slide carburetor (e.g., VM38SS or similar) - specific model in manual.
Fuel Type:
Unleaded gasoline (Octane rating specified in manual)
Ignition Type:
CDI (Capacitor Discharge Ignition)
Oil Type:
Specific viscosity and API rating (e.g., SAE 10W-40, JASO MA) to be found in the manual.
Cooling Method:
Liquid-cooled
Coolant Type:
Specific mixture ratio of antifreeze and water (e.g., 50/50) to be found in the manual.
Overall Length:
Varies by year, specific dimensions in manual (e.g., approx. 2170 mm / 85.4 in)
Overall Width:
Varies by year, specific dimensions in manual (e.g., approx. 830 mm / 32.7 in)
Overall Height:
Varies by year, specific dimensions in manual (e.g., approx. 1275 mm / 50.2 in)
Dry Weight:
Varies by year, specific weight in manual (e.g., approx. 114 kg / 251 lbs)
Wet Weight:
Varies by year, specific weight in manual (e.g., approx. 120 kg / 264 lbs with fluids)
Front Suspension Travel:
Typically around 300mm (11.8 in) for off-road focused models.
Rear Suspension Travel:
Typically around 310mm (12.2 in) for off-road focused models.
Infotainment System:
N/A (This is a competition off-road motorcycle; no infotainment features.
Driver Assistance Systems:
N/A (This is a competition off-road motorcycle; no driver assistance systems.
Connectivity Features:
N/A (This is a competition off-road motorcycle; no connectivity features.
Engine Oil Change Interval:
Typically every 10-15 hours of riding or per manual recommendations for specific conditions.
Air Filter Cleaning Interval:
Frequent cleaning required, especially in dusty conditions (e.g., every 5-10 hours).
Valve Clearance Check Interval:
Typically every 20-30 hours of riding or as specified by Yamaha.
Engine Oil Specification:
Refer to manual for exact SAE viscosity and API/JASO specification (likely 10W-40, MA).
Coolant Specification:
Refer to manual for coolant type and mixture ratio (e.g., 50% ethylene glycol antifreeze, 50% distilled water).
Brake Fluid Specification:
Refer to manual for DOT specification (typically DOT 4).
Fork Oil Specification:
Refer to manual for specific fork oil viscosity (e.g., SAE 0W or SAE 5W) and level.
Common Wear Items:
Clutch plates, piston rings, valve guides/seals, wheel bearings, steering head bearings due to off-road use and engine power.
Carburetor Tuning:
May require specific jetting and needle adjustments based on altitude and riding conditions.
Suspension Seals:
Fork seal and rear shock seal leaks can occur with heavy use.
Yamaha Motorcycle Division:
Yamaha Motor Company is a Japanese manufacturer of motorcycles, marine products, and other motorized products. Established in 1955, it has a rich history in motorsports and performance engineering.
Wr Series Development:
The WR series represents Yamaha's off-road competition motorcycles, evolving from earlier YZ motocross models. The WR426F succeeded the WR400F and was later replaced by the WR450F, bridging the gap in Yamaha's 4-stroke off-road lineup.
Manufacturing Origin:
Japan (Primary manufacturing location for Yamaha)
