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-2 Stroke air cooled single cylinder -Walbro membrane pump carburetor with dual needles and manual choke -Automatic advancing electronic ignition Product Details -Engine type ： 2—Stroke gasoline engine -Displacement：30cc -Bore × Stroke: 36mm × 30mm -park plug: NGK CM6 or JC CM6 -Carburetor: Walbro special-designing vacuum pump diaphragm type duplex needle carburetor -Max power ： 4.0hp/9000rpm -Practical running speed ： 1100 － 9000rpm -Net Weight ： 1100g (inclouding CDI and muffler) -Ignition system ： CDI battery ignition (battery voltage: 4.8v—6v) -Grease oil ratio ： 25-30:1 used during the break-in (the initial 2 working hours); 35-40:1 used after the break-in. -Screw propeller dimension ： 18*8, 18*10, 19*8, 19*10