Troy-Bilt 41AY4218766 Chainsaw, Gas, 42 cc Engine Displacement, 2-Stroke, Air-Cooled, Full Crank Engine, 18 in L BarThe TB4218 gas chainsaw features a 42 cc, full crank, two cycle engine. It comes with SpringAssist Technology for easier pull starts and a 18 in low kickback bar and chain cuts through limbs fast. The adjustable, automatic bar and chain oiler ensures proper lubrication, while the automatic, inertia activated chain brake adds operator safety. The three point anti vibration handles and lightweight design allows for easier handling and greater comfort.