Performance Jet Ski Crankshaft, Sea Doo Crankshaft, Yamaha Waverunner crankshaft including crankshaft seals and bearings for the bottom end rebuild.

A crankshaft is a mechanical component found in most internal combustion engines that converts linear motion from the pistons into rotational motion. It consists of a series of rods, or crankpins, that are attached to the ends of the pistons and connect to a central shaft. As the pistons move up and down in the cylinders, the crankpins rotate the crankshaft, which in turn drives the engine's output shaft and powers the vehicle.

The crankshaft is typically made from high-strength steel or cast iron and is supported by a series of bearings that allow it to rotate smoothly. It is an integral part of the engine's powertrain and plays a key role in the performance and efficiency of the vehicle. Crankshafts are typically designed to handle high levels of stress and wear, and are subjected to rigorous testing during the manufacturing process to ensure their strength and durability.