gasoline engine used for bicycle.with small volume .and weight is light.smooth line, start with hands and then automatic. bicycle gasoline engineuse oil + gasolinecan be start with handsand feet,and also between themscale of f50,f70,f80gross weight:f50:10kgf70:10.6kgf80:11.6kgsmall volumesmooth linenature beatifulwith EPA exhaust gasoline engine