1.4-Stroke brush cutter are popular with its high power 2.less fuel consumption 3.novel design 4. stable performance. Engine type ... :139F, 4-stroke,air cooled,single cylinderMixing ratio:1:25Displacement:31ccPower:0.7kW/6,500rpmldling ... is low noise,less fuel consumption,large displacement . 139F 4-Stroke 31cc professional lawn mower machine