- Specifically designed for the pro, semi-pro and amateur rider who freshens up their engine prior to a race or during midseason
- Gives the rider a choice of using standard gas with stock compression, or race gas with a higher compression
- Specifically designed for the pro, semi-pro and amateur rider
- Freshens up their engine prior to a race or during mid-season
- Kits do not include valve stem seals, rubber part, shims or other fiber gaskets
| Compatible Vehicles | |||
| Years | Make | Make | Notes |
| 1987-1999 | Yamaha | Big Bear 350 YFM350FW 4x4 | |
| 2004 | Yamaha | Big Bear 400 YFM400 | |
| 2004-2006 | Yamaha | Big Bear 400 YFM400F 4x4 | |
| 2007-2012 | Yamaha | Big Bear 400 YFM400FB 4x4 IRS | |
| 1993-1999 | Yamaha | Kodiak 400 YFM400FW 4x4 | |
| 1987-1995 | Yamaha | Moto 4 YFM350ER | |
| 1987-2004 | Yamaha | Warrior 350 YFM350X | |
| 2000-2005 | Yamaha | Wolverine 350 YFM350FX 4x4 | |