... power 2.less fuel consumption 3.novel design 4. stable performance. Engine type:139F, 4-stroke,air cooled,single cylinderMixing ratio:1 ... :26mmEngine weight:3.5kgMachine weight:9.5kg/7.5kgCarrying type:backpack or side-attachedThis is our latest products and it is ... it is low noise,less fuel consumption,large displacement . 139F 4-Stroke 31cc professional lawn mower machine