A motorcycle includes a frame and an engine, with the engine including components forming a crankshaft assembly, such as a flywheel, a pinion shaft supporting the flywheel for rotation, a piston assembly including a connecting rod with a base end portion having a bearing support structure, a bearing, and a crank pin. An uninterrupted oil passageway is formed by an axial hole in the pinion shaft, a radial hole in the pinion shaft, an aligned hole in the flywheel, an angled hole in the crank pin, at least one radial hole in the crank pin. The angled hole in the crank pin extends between the inner and outer surfaces, with the angled hole starting on the outer surface at a location along a distance L1 and extends to the inner surface exiting at a location inboard of the distance L1, the angled hole being linear along its length.