1:Double import bearings 2: High power 3: Stable performance 1:Main parameter: Engine type:139F, 4-stroke,air cooled,single ... this owner's manual.4: Do not operate the engine when the top cover is removed .5:Do not ... rotating parts or burned by the muffler.7: Stop engine and keep heat,sparks,and flame away.8:Refuel only ... and precautions in this owner's manual. brush cutter gasoline engine 139F