SSP-G Transmission Power Pack for 50cc 4-Stroke 139QMB Chinese Honda Cloned Scooters, Kymco, SYMINCLUDES: 1500 RPM SpringSpring Inner Diameter: 49mmSpring Height: 107mmRoller Weight Size: 16x13mm (8g)Variator Outer Diameter: 87mmClutch Drum Number of Splines: 22Clutch Drum Spline Inner Diameter (peak to peak): 11.10mmSliding Clutch Plate Outer Diameter: 119mmDrive Plate Number of Splines: 26Drive Plate Spline Inner Diameter (peak to peak): 13mmDrive Plate Outer Diameter: 113mmCOMPATIBILITY: 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 – 50