Hi, I have a old rat bike build that i built awhile back and got it back on the road. The bike is a old Murray i recycled from a trash pile. The engine is a Dax F80 (66cc.). It has a Manic Machanic clutch activator. It also has a Manic Machanic 40 tooth sprocket and adapter. I did some light port work on the engine and will be putting a new carb. from Dax on it. I have had the engine for about 8 years with no problems.