Model number: 81451 Chain saw Displacement: 45cc Length of guide bar: 18" or 20" Certificate: GS, ... one cylinder,air-cooledDisplacement 45cc Engine power 1.8KW Carburetor type DiaphragmaticStarting systemRecoiled, iuauelFuel mixed ratio 25:1Lubrication type, saw-chainAutomaticEngine oil tank capacity0 ... power output, save more gas, more longer time for use. 45cc gasoline chain saw, GS,CE,EMC approved