... High power 3: Stable performance 1:Main parameter: Engine type:139F, 4-stroke,air cooled,single cylinderMixing ratio ... performance4:Be careful:1: Always perform a preoperation inspection before each operation,and correct any problem.2: ... 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: ...