... High power 3: Stable performance 1:Main parameter: Engine type:139F, 4-stroke,air cooled,single cylinderMixing ratio ... seal, can solve the problem of burning oil2: Install the hard wearing copper sheath, regulating valve3: Double ... owner's manual.4: Do not operate the engine when the top cover is removed .5:Do ... parts or burned by the muffler.7: Stop engine and keep heat,sparks,and flame away.8:Refuel ...