3G Speed Clutch for 50cc 107mm clutch as seen on Kymco, Piaggio, Peugeot scooters and 139QMA/QMB engines. This clutch features a great design with lightweight clutch blocks and reinforced friction plates. Varying the speed at which the clutch engages means the engine can rev to higher RPMs before the power comes in. This means more traction, better performance on hills, everyday use and traffic light acceleration. The clutch cannot be further adjusted, you can achieve this change in engagement speed with different clutch springs. A great tuning clutch for maxi scooters! Diameter: 107mm Weight: 632g