Clutch - Centrifugal with Clutch Bell, 5.5HP, 6.5HP, 10 Tooth. This clutch is used on many motorized products based on the 5.5HP and 6.5HP (GX160 and GX200) style engines and most commonly (though not exclusively) with the 3/4 inch (19mm) shaft variation. This clutch is commonly used on the Baja series bikes, Baja Doodle Bug, Baja mini bike etc. Also used on such machine types as the Drift II Go Kart Buggies etc.. This clutch has a 19mm bore so it will suit engines with a 19mm shaft on the standard 5.5hp or 6.5hp engines. The drive sprocket has 10 teeth. This clutch is to suit 420 chain and sprockets. This is considered a performance clutch for the 11 tooth Doodlebug and mini bike (97cc 16mm) from Baja Motorsports because as a 10T replacement for the original 11T the rider will increase the stock acceleration of their bike.