Our high quality Clutch Assemblies are the exact OEM replacement part for many Chinese manufactured brands and models of Chinese ATVs, Dirt Bikes, Go Karts and Scooters. This Chinese part fits many models and makes of Chinese ATVs, Scooters, Mopeds and Go Karts. Uses 17 Teeth Drive Gear Popular in 50-110cc semi-auto engines Some full-autos may use this Will NOT fit 18T drive gears CLUTCH ASSEMBLY IS MACHINED FOR THE 17 TEETH SMALL DRIVE GEAR located behind the clutch assy and this little 17T gear just slides on the crankshaft. ? Clutch assembly meshes with this drive gear. 90% of 50-125 engines use this clutch configuration. Very popular disc style clutch assembly used in 50cc thru 110cc engines. For positive ID of your clutch, we recommend that you remove the right engine cover and inspect before ordering. This clutch is NOT used for manual style clutch or handlebar mounted clutch levers. Most popular in ATVs or semi-auto engines, 50cc thru 110cc. Some full automatic engines use this