... Displacement: 45cc Length of guide bar: 18" or 20" Certificate: GS,CE,EMC,EPA,EU1,EU2 Specifications: Model No.81451Engine typeGasoline engine,2 ... start design for faster and easier starting to save power.* With gas pump design for faster starting, to guarantee starting in ... gas, more longer time for use. 45cc gasoline chain saw, GS,CE,EMC approved