- Slows down the rev while auto-clutch engages, eliminating any lurch that may intimidate beginning riders
- Limit maximum opening to 1/4, 1/2 or 3/4 throttle; helps rider learn control faster
- Learning aid for beginners who ride smaller-cc motorcycles
- Easily installed through the carburetor top cap
| Compatible Vehicles | |||
| Years | Make | Make | Notes |
| 1992 | Gas Gas | EC50 | |
| 2001 | Gas Gas | EC50 Boy | |
| 2004-2006 | Gas Gas | EC50 Boy | |
| 2001-2005 | Gas Gas | EC50 Rookie | |
| 2006 | Gas Gas | MC Boy 50 | |
| 2005 | Gas Gas | MC50 Boy | |
| 2001-2006 | KTM | 50 SX Pro Sr LC | |
| 2002-2005 | LEM | R3 | |
| 2003-2005 | LEM | R3 XC | |