Fitment:for 66cc 80cc 2-Stroke Motorized Bike Package include:1 x Arch Idler Pulley Chain Tensioner Kit+1 x Chain Wheel Give you a very consistent tension on the chain. Very easy to adjust. Arch design for performance and easy of use. Can be used with all motors including 2-stroke 48cc and 66cc/80cc plus 4-stroke 49cc engines. Replacement for original part.Please check part comparibility to see if it fits your model.