The Kohler 1601417-S Engine Crankshaft Assembly converts the piston's up-and-down movement into rotational motion that drives the engine. It works with the connecting rod and other internal components to support the engine's operating cycle. Replacing a worn or damaged crankshaft assembly can help restore proper engine movement and maintain reliable performance. Check your engine mode... https://www.wholetoolbox.com/kohler-1601417-s-engine-crankshaft-assembly/1601417-S.html