Harley Davidson Motorcycle Crankshafts & Components

A crankshaft is one of the key components of your Harley Davidson’s engine that transforms the energy of moving pistons into rotary motion. Pistons move up and down in the cylinders pushed by the energy of the exploding air-and-fuel mixture. They are connected to the pushrods that rotate the crankshaft. A flywheel is added to the shaft to partially store the rotational energy, smooth out the rotation and balance vibrations created by the combustion process. A crankshaft rotates relatively fast, which cannot be used efficiently on the low-speed range and under heavy loads, which is why the transmission is added to the system.

Your crankshaft is connected to the input shaft of the gearbox that multiplies torque and transmits engine power to the rear wheel through the drive chain or belt for starting a bike and making it move at slower speeds and uphill. You can upgrade your engine by installing an aftermarket flywheel assembly made from strong, heat treated alloys that are able to withstand much heavier loads than their stock analogs. Browse our catalog of Harley Davidson motorcycle crankshafts and related components by some of the most trustworthy brands in the industry, such as S&S Cycle, JIMS, East Performance, Andrews Products, and many others.