Chainsaw - a portable, mechanical saw powered by an electric motor, compressed air, hydraulic booster or gasoline engine, the working part of which is a chain saw, consisting of a chain closed in a ring moving along a guide rail. The tire and chain are removable, so they are called the "headset." Chainsaws are actively used by woodcutters when cutting wood, cutting branches, clearing forest debris, including for the purpose of extinguishing forest fires or preventing them, for cutting concrete, as well as ice when creating ice sculptures or ice holes. A chainsaw or chainsaw is a hand-held chain saw equipped with an internal combustion engine. The chainsaw is driven by a two-stroke gasoline internal combustion engine connected via a transmission system (clutch and sometimes gear) to the saw chain. Starting the engine - with a manual cord starter. Ignition - electronic, magneto rotor, as a rule combined with the flywheel and the impeller of the cooling fan. The carburetor is of the membrane type, which, in combination with the corresponding fuel intake system from the tank, allows the engine to work normally in any position.