Description
If you’re running a TRX450R at the track or trail, your stock piston limits how much power your engine can safely produce. The Wiseco 99mm piston kit with 12.5:1 compression ratio unlocks measurable horsepower gains while maintaining the reliability your machine demands. This is a direct bolt-in upgrade for 2004-2005 models—no fabrication required.
Wiseco’s forged aluminum construction handles the higher combustion pressures from the optimized compression ratio, giving you stronger power delivery across the RPM band without sacrificing longevity. The lightweight design also sharpens throttle response, which matters whether you’re competing or pushing hard on tight terrain.
- Bore diameter: 99mm
- Compression ratio: 12.5:1
- Material: Forged aluminum
- Fitment: 2004-2005 TRX450R
- MPN: 4889M09900
- Installation: Bolt-on
- Special tools: None required
- Gasket kit: Sold separately
- Throttle response: Improved
- Durability: Extensively tested
