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 ... using,in general,disassembling is not recommended.7.Before using,carburetor must be cleaned after 100hours working.8.Air filter must ... be packed by plastic bags,avoiding from dust and moisture. gasoline chain saw