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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 YZ450F Dirt Bike (2003-2026)
The Yamaha YZ450F, a dominant force in motocross, has been continuously refined from 2003 to 2026. This high-performance dirt bike is renowned for its powerful 449cc engine and advanced chassis, designed to deliver a competitive edge and an exhilarating riding experience. Over two decades, Yamaha has consistently pushed boundaries, integrating cutting-edge technology and rider-focused improvements. The YZ450F has undergone several significant generational shifts. The 2003 model saw an engine displacement increase to 449cc and a lighter frame. A major overhaul in 2006 introduced an all-new aluminum single-backbone frame and KYB SSS forks. The revolutionary reversed cylinder engine design debuted in 2010, followed by the adoption of fuel injection in 2012. The 2014 model brought a new bilateral aluminum beam chassis. The 2023 iteration marked a complete redesign, featuring a lighter, more compact engine, a new frame, dry-sump lubrication, and advanced electronic rider aids like Traction Control, all controllable via the Yamaha Power Tuner App. While 2024 carried over these updates, 2025-2026 are expected to bring further refinements. Q: Will this part fit my Yamaha YZ450F?
A: To ensure perfect compatibility, please use the year and edition selector at the top of this page.
Maintenance
| Component | Interval | Details |
| Engine Oil and Oil Filter | Every 5 to 10 hours | Change both together. 5 hours for aggressive/race-level riding; 10 hours for recreational riding. |
| Air Filter | Every 2 to 15 hours | Intervals vary significantly by model year and riding conditions. For some years (e.g., 2003, 2006, 2018), 2 hours for aggressive/race, 5 hours for recreational. For others (e.g., 2010, 2022, 2025, 2026), 5 hours for aggressive/race, 15 hours for recreational. Clean and re-oil regularly. |
| Spark Plug | As needed | No fixed replacement interval. Inspect regularly for wear, fouling, or incorrect gapping. Clean, re-gap, or replace as necessary. |
| Coolant | Every two years or 60 hours or 24,000 km | General recommendation is every two years. Some models specify 60 hours (e.g., 2022) or 24,000 km (e.g., 2026). Replace sooner in harsh conditions. Use coolant recommended for aluminum engines. |