Using this Unique Cutaway (Cut in half) Chainsaw, I Explain how A 2stroke chainsaw engine is an amazing combination of power and simplicity that is ideal for heavyduty cutting jobs and tree felling. 2stroke engines are small and light, completing a power cycle in just two piston strokes, in contrast to their 4stroke counterparts. Once you blend fuel and oil in a precise ratio—usually 50:1—and pour it into the fuel tank, the magic begins. The engine roars to life the moment you pull the starter cord.

The compression and ignition strokes start the process inside the engine. The fuelair mixture in the cylinder is compressed as the piston rises. This mixture is subsequently ignited by a spark plug, producing a flaming explosion that exerts tremendous force on the piston. The chainsaw gets its power from this downward action. Precision cutting of wood is made possible by the crankshaft being turned by the piston's descent.

The 2stroke engine doesn't spend a stroke on venting burnt gases, though, which is the twist. Rather, the exhaust stroke is the upward motion of the piston, which forces the exhausted gases out of the cylinder through ports near the top. The entering fuelair mixture is drawn into the crankcase concurrently. The cycle is repeated when the piston rises again and compresses this new mixture. Chainsaws are an essential tool for both outdoor lovers and lumberjacks because of their clever design, which produces raw power despite being less fuelefficient and more polluting than 4stroke engines.