Max Cutting Diameter:500mm Power Type:Single Cylinder, Two-stroke, Air-cooling gasoline engine. Cylinder Diameter x Stroke:48*31mm Displacement:51.2cc Compress Ratio: 6.1:1 Rated Output Power & Relevant Speed: 2.2Kw/7500rpm Fuel Mixture Ratio: 25/1(Gasoline 25:Two-cycle Oil 1) Fuel Tank Capacity:550ml Engine Oil Tank Capacity:260ml Chain Oil:Special oil for two-cycle engine Ignition System:C.D.I Starting System:Automatic recoil hand starter Guide Bar Size: 18"/20"/22" China: Oregon / Carlton Chain Pitch:0.325" Chain Gauge:0.058" G.W/N.W:7.7/6.5kg