... Displacement: 45cc Length of guide bar: 18" or 20" Certificate: GS,CE,EMC,EPA,EU1,EU2 Specifications: Model No.81451Engine typeGasoline ... engine,2-stroke,one cylinder,air-cooledDisplacement 45cc Engine power 1.8KW Carburetor type DiaphragmaticStarting systemRecoiled, iuauelFuel mixed ratio 25:1Lubrication ... gas, more longer time for use. 45cc gasoline chain saw, GS,CE,EMC approved