Compatible with a 25 tooth motor sprocket only (like the OEM 40308-94 motor sprocket which is the OEM equipment on all 94-06 models). This chain drive kit is identical to the complete BDL primary chain drive kit (MCS 518709), but this kit includes the clutch assembly only. The clutch shell includes a starter ring gear for electric start options and contains the BDL competitor clutch for positive shifts and no clutch drag. This chain drive kit will fit inside the stock primary housing. You can re-use you existing primary chain, chain adjuster and motor sprocket. The starter gear is included. Will fit the stock primary housing.