gasoline chain saw 38cc,45cc,52cc hedge trimmer:22.5cc brush cutter:24.5cc,32.6cc,42.6cc gasoline chain sawEngine type: Gasoline engine,2-stroke,one cylinder ... .3.Mixture of gasoline and oil rate is 25:1.4.For the first time,it must start the machine for 5minutes ... before working.5.After operating,must wait for the chain guide under the oil ...