... performance. Engine type:139F, 4-stroke,air cooled,single cylinderMixing ratio:1:25Displacement:31ccPower:0.7kW/6,500rpmldling speed:2800r/minCarburetor:diaphragm ... cutter,140Fbrush cutter and GX35 brush cutter.This kind of gasoline suitable for any complex environment to cut grass and it ... is low noise,less fuel consumption,large displacement . 139F 4-Stroke 31cc professional lawn mower machine