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Description
Take your performance to new heights with a Jet Kit for your vehicles. Increase power and improve performance throughout the entire RPM range, while improving throttle response and smoothness. These Jet Kits take the guesswork out of tuning your vehicles.
Whether you’re rolling with a stock vehicles or you’ve made some modifications, our Jet Kit will optimize your air/fuel ratio to eliminate rough spots and help you take control of your vehicles’s power. You can go with a Stage 1 Jet Kit to give your stock engine a 5% boost of horsepower or send it all the way up to Stage 3 if you’ve already made major modifications to your vehicles.
STAGE 1 DETAILS
Perfect for vehicles with a stock engine using the stock airbox, air filter, and pipes. Stage 1 Jet Kits are engineered to improve throttle response and deliver approximately 5% more horsepower than stock. These kits are fully adjustable to allow the use of well-designed aftermarket pipes and stock replacement air filters, like K&N.
STAGE 2 DETAILS
If you’ve made slight modifications to your vehicles, but still crave more performance, a Stage 2 Jet Kit is the solution. With a Stage 2 Jet Kit, you could see power gains of approximately 8%. This kit is intended for vehicles with stock or mildly tuned engines using a well - designed aftermarket pipe with a modified airbox and a stock replacement air filter.
FEATURES
- 5-8% power range.
- Fully adjustable.
- Increases power and drivability.
- For carbureted vehicles only.
Technical Specifications
- MFG. Part Number 3243
Vehicle Information
Yamaha WR450F Dirt Bike (2003-2026)
The Yamaha WR450F, an iconic off-road and enduro motorcycle, was introduced in 2003 and has continued to evolve through 2026. Powered by a 449cc (often rounded to 450cc) liquid-cooled, four-stroke engine, it is renowned for its versatility and off-road performance. While generally offered as a single model without distinct trim levels, the WR450F has undergone several major redesigns over the years. Early versions, from 2003 to 2011, were carbureted. A significant change occurred in 2012 with the adoption of electronic fuel injection and a new aluminum frame based on the YZ450F, enhancing handling and power delivery. Other notable evolutions include the introduction of the "reversed" engine design in 2015 and substantial engine and chassis updates in 2019 and 2021, aimed at optimizing enduro performance and efficiency. FAQ:
Q: Is this part compatible with my Yamaha WR450F?
A: To ensure perfect compatibility, please use the year and edition selector on this page.
Maintenance
| Component | Interval | Details |
| Engine Oil and Oil Filter | Every 1,000 km or 5 rides (2003); Every 10 h (recreational) or 5 h (aggressive/race) for other years | Replace filter with each oil change. Approximately 1.1 L of oil with filter change. |
| Air Filter | After break-in and every race (2003); Every 15 h (recreational) or 5 h (aggressive/race) for most years | Clean and re-oil regularly. Inspect and replace if damaged. Interval may be 10 h for recreational riding on some years (e.g., 2015). |
| Spark Plug | Inspection every 500 km or every 3 races (2003); Inspection after break-in and every race (2006) | Periodic inspection is recommended for all model years. |
| Coolant | Check level before each ride | Inspect hoses for leaks or wear. |
| Drive Chain | Every 5-10 h | Clean and lubricate. The WR450F uses a chain, not a belt. |