- 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 |
| 1980-1981 | Yamaha | Champ 50 LC50 | |
| 2016-2026 | Yamaha | PW50 | |
| 1981-2009 | Yamaha | PW50 Y-Zinger | |
| 2012-2015 | Yamaha | PW50 Y-Zinger | |
| 1979-1987 | Yamaha | QT50 Yamahopper | |
| 1981-1982 | Yamaha | Towny 50 MJ50 | |