Genuine Baja Motorsports Replacement Part Product Specs: Clutch assembly (#17) is replacement clutch for 49cc 2-stroke Chinese manufactured brands and models. Popular in Taiwan manufactured mopeds & scooters. Clutch details:16 splines inside the clutch drum/bell 12mm ID on bell at splines 6901 bearing in clutch shoe plate OD of bell housing: 119mm [4.7″] ID of bell housing: 112mm [4.4″] Three shoes Pulley OD: 115mm [4.5″] Pulley ID: 17mm [.669″] Width of pulley: 25mm [.97″] on outside BKM172514U-1 bearing in pulley Fits Taiwan 49cc 2-stroke engines Compatible with SC50 50cc Baja Scooter Baja Part Number & Description: SC50-328; ClutchAssembly Known to fit scooters with the 50cc 2-stroke 1PE40QMB or 90cc 2-stroke 1PE50QMF Minarelli based engine used by Adly, Aeon, Aprilia, Atala, Benelli, Beta, BKM, BSV, CPI, Dinli, Eton, Fly, Geely, Genuine, Italjet, Kasea, Keeway, Kreidler, KTM, Kymco, Linhai, Malaguti, MBK, Minarelli, Motron, MZ, PGO, Polaris, Strada, TNG, Vento, Xtrem and Yamaha.