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The flywheel key keeps the engine flywheel and the crankshaft connected. In the event that the engine is forced to a sudden stop, the flywheel key could be sheared off, making it impossible for the engine to start back up again. Replacing the flywheel key is a part of routine maintenance for many modern engines, so it should be inspected and replaced as needed. This sturdy metal flywheel key is easy to install, but remember to choose the right torque setting when doing the replacement. Always disengage the spark plug and wear gloves when replacing engine parts. This genuine flywheel key is designed to be used in a number of lawn and garden equipment products from MTD, Troy-Bilt, Yard Machines, Cub Cadet, Yard-Man, Husky, and Bolens. It can be used as a replacement for many models of snowblowers, lawnmowers, and log splitters. Sold individually.