Silver Bicycle Engine Kit, Gas Bike Engine Kit, Motorized Bike Engine Kit, low price with good quality, four types for choice Why are you ... from us.Silver Bicycle Engine Kit, Gas Bike Engine Kit, Motorized Bike Engine Kit Specification: Model50cc(48cc) 60cc80cc(66cc)Engine typesingle cylinder, air-cooling ... -stroke machine oil (or 10W/40, 10W/30 machine oil)Mixing ratio of fuel and engine oil16:1 for ...