GOOFIT Complete Clutch Assy for GY6 125cc 150cc Engine Parts Scooter Moped ATV Go Kart Inner Diameter (bell): 125mm Number of Splines: 19 Outer Diameter (bell): 137mm; Splines Inner Diameter (peak to peak): 13.6mm Arrival within 1-2 days (Sold by GOOFIT and Fulfilled by Amazon) Arrival within 7-15 days (Ships from and sold by GOOFIT)