The saw is a base #137 model with a 16 inch chain ,bought for cheap with no muffler,it has plenty of power for the small odd jobs Ill be using it for around the house. A good bit of info to keep those small and big chainsaws running well is to stay away from mixing your own fuel ,this is due to the alcohol allowed in todays gas station fuels which small carbs will not tolerate over time.Truefuel is cheap enough and is already mixed with oil and a non-alcohol 93 octane fuel base.To keep your mower fuel system up to snuff a good source recommended dumping the fuel out during the winter time.A small engine repair shop who likes to keep their doors open supplied the reasoning behind the peak months , right as spring comes on ,the mowers come in by the dozens.