1. High efficiency clutch spring: Increase speed and reduce clutch failure, stable performance, reliable in use. 2. Sprężyna momentu obrotowego 1000 obr./min: zapewnia maksymalną przyczepność i wyższe obroty podczas startu. Spend some speed for more power when you are driving uphill. 3. Sturdy and durable: made of high quality material, high strength and long durability. The surface coating is hard and not easy to fall off. 4. Fitment:Replacement for 50cc-100cc GY6,Fit for 139QMB and 1P39QMB motorbike ATV motor. 5. Easy installation: the installation is simple and fast, no complicated operation required, convenient to use. Specification: Item Type:Torque Spring + Clutch Spring Torque Sprężyna obrotowego: 1000 obr./min Function: Increase the speed and reduce clutch failures, spend some speed when driving uphill to provide more power. Including: 1 x Torque Spring 1000 RPM , 3 x Clutch Spring Fitment:Replacement for GY6 50cc-100cc, Fit for 139QMB and 1P39QMB Motorbike ATV Engines Package List: 1 x Reaction Spring 3 x Clutch Springs