The Yamaha WR426F, produced from 2000 to 2008, is a robust off-road motorcycle built for demanding enduro and trail riding. Renowned for its heritage in high-performance, competition-ready machines, the WR426F features a powerful 4-stroke, liquid-cooled engine with a 426cc displacement and a 5-valve DOHC configuration. Its design prioritizes rider control and mechanical prowess, incorporating a constant-mesh 5-speed transmission, wet multiple-disc clutch, and chain drive. The chassis is equipped with advanced suspension systems, including an upside-down telescopic front fork and a linkage-type rear suspension, complemented by hydraulic disc brakes for reliable stopping power.
This comprehensive service repair workshop manual is designed to guide owners, independent service professionals, and technicians through the maintenance and repair of the Yamaha WR426F. It covers all major topics, including detailed engine specifications, removal and installation procedures, fuel system, powertrain components, chassis systems, and the electrical system with wiring diagrams. The manual provides step-by-step repair instructions, routine maintenance schedules, troubleshooting guidance, and diagnostic procedures. With clear, concise text, diagrams, and illustrations, this manual empowers users to perform upkeep, address common issues, and ensure the optimal performance and longevity of their WR426F.
Production Years Covered:
2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008
Target Audience:
Yamaha WR426F owners with basic mechanical skills, independent service professionals, and informed owners
Differentiation:
Vehicle-specific, not generic; same information used by authorized dealer technicians; clear, concise text with illustrations
Value Proposition:
Saves money on repairs and maintenance, empowers owners with knowledge, ensures proper vehicle upkeep
Content Quality:
Accurate, clear, concise text; step-by-step instructions; diagrams; illustrations; wiring schematics; specifications
Primary Coverage:
Service, Repair, Workshop
Secondary Coverage:
Maintenance, Troubleshooting, Diagnostics
Estimated Page Count:
Comprehensive (Exact number not specified, but described as 'full service and repair instruction' and 'all major topics are covered complete')
Type:
Service Repair Workshop Manual
Digital Format:
PDF Download
Engine:
Engine Specifications, Engine Removal and Installation, Fuel System, Intake & Exhaust
Powertrain:
Transmission, Drive Chain, Sprockets
Chassis:
Steering System, Shocks, Body Work
Electrical:
Electrical System, Wiring Diagram
Maintenance:
Routine Maintenance, Periodic Checks and Adjustments
Repair:
Step-by-step repair instructions for all major systems
Troubleshooting:
Advanced Troubleshooting, Diagnostic procedures
Depth:
Comprehensive (covers full service and repair, equivalent to dealer service department resources)
Visuals:
Diagrams, Illustrations
Compatibility:
All Versions of Windows AND Mac
Reader Requirements:
Adobe PDF Reader
Printability:
Yes, all pages are printable
Binding:
Not Applicable (Digital PDF Download)
Paper Type:
Not Applicable (Digital PDF Download)
Engine Type:
4-Stroke, Liquid-cooled, DOHC, 5-valve
Engine Displacement:
426cc
Bore X Stroke:
95.0 mm x 60.1 mm (Typical for WR426F, refer to manual for exact spec)
Compression Ratio:
12.0:1 (Typical for WR426F, refer to manual for exact spec)
Fuel Delivery:
Carburetor (Mikuni, typically 37mm or similar, refer to manual for exact spec)
Fuel Type:
Unleaded gasoline (Refer to manual for octane rating)
Transmission Type:
Constant-mesh 5-speed sequential
Clutch:
Wet, multiple-disc
Overall Length:
Approx. 2,255 mm (Refer to manual for exact spec)
Overall Width:
Approx. 825 mm (Refer to manual for exact spec)
Overall Height:
Approx. 1,235 mm (Refer to manual for exact spec)
Curb Weight:
Approx. 119 kg (Refer to manual for exact spec)
Crash Test Ratings:
Not Applicable (Off-road motorcycle)
Braking System:
Hydraulic disc brakes (Front and Rear)
Suspension:
Upside-down telescopic fork (Front), Link-type suspension (Rear)
Infotainment System:
Not Applicable (Basic off-road motorcycle design)
Electronic Aids:
None (Focus on rider control and mechanical performance)
Connectivity Features:
None
Oil Change Interval:
Refer to manual for specific mileage/hour intervals; typically after break-in and then periodically based on usage (e.g., every 1000-2000 km or specific hours of operation)
Air Filter Cleaning:
Frequent cleaning recommended based on riding conditions (e.g., dusty environments require more frequent attention)
Engine Oil Type:
Yamalube (or equivalent premium motorcycle-specific 4-stroke engine oil), viscosity typically 10W-40 or 20W-50 (Refer to manual for exact specification and API service classification)
Coolant Type:
High-quality antifreeze coolant (Mixture of ethylene glycol and distilled water, typically 50/50) (Refer to manual for exact specifications)
Brake Fluid Type:
DOT 4 (Refer to manual for exact specification)
Typical Wear Items:
Clutch plates, brake pads, drive chain and sprockets, wheel bearings, fork seals
Common Maintenance Tasks:
Carburetor cleaning and adjustment, valve clearance checks, spark plug replacement, chain lubrication and adjustment
Brand Focus:
Yamaha is renowned for its long history of producing high-performance motorcycles, particularly in off-road and racing applications.
Model Lineage:
The WR426F succeeded the WR400F and was a precursor to the WR450F, representing Yamaha's continuous development in the open-class enduro segment.
Manufacturing Origin:
Japan (Typical for Yamaha motorcycles)
Performance Accolades:
Yamaha WR series motorcycles are known for their competitive performance in enduro and off-road racing, often receiving positive reviews from enthusiasts and professional riders.
