SSP-G Complete Clutch Kit for 50cc 4-Stroke 139QMB ScootersSPECIFICATIONS: Clutch Bell Inner Diameter: 107mmClutch Bell Outer Diameter: 115mmClutch Inner Diameter: 12mmUses 6901 RS bearingNumber of Splines (clutch bell): 22Splined Inner Diameter (peak to peak): 11mmSplined Inner Diameter (valley to valley): 12mm1500 RPM Torque Spring1000 RPM Clutch SpringsCOMPATIBILITY: Amigo – 50cc 4-Stroke ScootersApollo – 50cc 4-Stroke ScootersBaotian – 50cc 4-Stroke ScootersBaron – 50cc 4-Stroke ScootersBintelli – 50cc 4-Stroke ScootersBMS – 50cc 4-Stroke ScootersCoolster – 50cc 4-Stroke ScootersCSC – 50cc 4-Stroke ScootersDiamo – 50cc 4-Stroke ScootersFlyscooter – 50cc 4-Stroke ScootersIce Bear – 50cc 4-Stroke ScootersItalica – 50cc 4-Stroke ScootersJCL – 50cc 4-Stroke ScootersJonway – 50cc 4-Stroke ScootersKandi – 50cc 4-Stroke ScootersKinroad – 50cc 4-Stroke ScootersKMD – 50cc 4-Stroke ScootersKymco – 50cc 4-Stroke ScootersLance – 50cc 4-Stroke ScootersLeike – 50cc 4-Stroke ScootersLinhai – 50cc