Abstract: A crankshaft apparatus is disclosed which includes a crankshaft having a crank pin, an inner portion, a middle portion, and an end portion, a bearing mounted about the crankshaft inner portion, a sleeve mounted about the crankshaft middle portion, a flywheel mounted about the sleeve, and a clutch mounted about the crankshaft end portion. The clutch has a driven side fixed to the flywheel, and a driving side. The driving side is operably connected to the crankshaft end portion by a key mechanism, which includes alignable slots formed in the crankshaft and the clutch, and keys mountable in the slots.