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Description
Technical Specifications
- MFG. Part Number T-19049
Vehicle Information
Yamaha WR426F Dirt Bike (2001-2002)
The Yamaha WR426F is an iconic off-road motorcycle produced for the 2001 and 2002 model years. Specifically designed for enduro riding, it stands out with its robust engine and a platform focused on all-terrain performance. It features a four-stroke, single-cylinder, DOHC, five-valve engine with a displacement of 426 cc. There were no significant generation changes or major engine overhauls between the 2001 and 2002 models. The core engine specifications remained consistent. The primary distinction lies in the factory restrictions imposed on the 2001 model (airbox lid, muffler insert, throttle stop) to comply with noise regulations. These restrictions could be removed for closed-course competition, unleashing the engine's full potential. The 2002 model is generally cited with a maximum power of approximately 58 horsepower, representing the engine's unrestricted output, whereas the 2001 model was officially listed at 47 horsepower with restrictions. The WR426F was offered as a single model, with no distinct trim levels. FAQ:
Q: How can I ensure this part fits my Yamaha WR426F?
R: To confirm exact compatibility with your motorcycle, please use our year and edition selector located at the top of this page.
Maintenance
| Component | Interval | Details |
| Engine Oil Change | Every 5 or 10 hours (depending on use) | Recreational use: every 10 hours. Aggressive/Race-level use: every 5 hours. It is recommended to change oil and filter with each oil change. |
| Oil Filter | With each engine oil change | |
| Air Filter Service | Every 5, 10 or 15 hours (depending on year and use) | 2001 Model: recreational every 10 hours, aggressive every 5 hours. 2002 Model: recreational every 15 hours, aggressive every 5 hours. Regular cleaning and oiling enhance efficiency. |
| Spark Plug | Every 10,000 km | |
| Coolant | Every 10,000 km | Check and adjust radiator and sub-tank levels. |
| Valve Inspection | Every 10, 15, 20 or 30 hours (depending on year and use) | 2001 Model: recreational every 20 hours, aggressive every 10 hours. 2002 Model: recreational every 30 hours, aggressive every 15 hours. |
| Top-End Inspection | Every 20, 30, 40 or 60 hours (depending on year and use) | 2001 Model: recreational every 40 hours, aggressive every 20 hours. 2002 Model: recreational every 60 hours, aggressive every 30 hours. |
| Bottom-End Inspection | Every 40, 50, 80 or 100 hours (depending on year and use) | 2001 Model: recreational every 80 hours, aggressive every 40 hours. 2002 Model: recreational every 100 hours, aggressive every 50 hours. |
| Chain Maintenance | Regularly | Regular cleaning, lubrication, and tension adjustment to prevent premature wear. |