The Stihl MS 170 is a gas-powered chainsaw, using an 8.5 oz. gas tank to power a 1.7 bhp, 30.1 cc engine. With the power of that engine, combined with its 16 in. guide bar and 8.6 lbs. power head ...

Two-cycle engine and the gas-to-oil ratio. For a two-cycle engine, you must mix gas and oil together in a specific ratio. Old chainsaws, manufactured prior to 2003, require a 32:1 ratio.