- Holds valve spring bucket down so adjusting shims can be removed or installed
- Will not work on the following models XZ550, XVZ1200/1300, FJ1100/1200, XT250L, XT/TT350
- Manufactured of hardened alloy steel
| Compatible Vehicles | |||
| Years | Make | Make | Notes |
| 1978-1981 | Yamaha | XS1100 | |
| 1980-1981 | Yamaha | XS1100L Midnight Special | |
| 1979-1981 | Yamaha | XS1100S Special | |
| 1977-1979 | Yamaha | XS750 | |
| 1978-1979 | Yamaha | XS750S | |
| 1980 | Yamaha | XS850 | |
| 1981 | Yamaha | XS850 Venturer | |
| 1980-1981 | Yamaha | XS850L Midnight Special | |
| 1980-1981 | Yamaha | XS850S Special | |