Fits GY6 125cc&150cc 4 Stroke Engine 19 Splines Inside The Clutch Drum/Bell OD of Drum: 136mm??ID of Drum: 125mm ID of spline area: 14.4mm??Pulley Diameter: 140mm New High Quality Aftermarket Replacement Clutch Assembly AH is specialized in providing parts and accessories for Off-Road Motorcycles, Karting, ATV and Scooters/E-ScootersWe are your one-stop-shopping choice from replacement parts to Plastic Body Fender Kit accessories. Always ready to meet the end of Motorcycle Powersports Lovers. We supply parts to support ranges of models and constantly update the catalogue to fit the latest product. We offer unconditional services for our product and are ready to provide you with the best pre-sale/after-sale service. A big part of the story between us would begin with a small part.