Abstract: A dual purpose outer primary housing, or cover, for a motorcycle drive train is provided. The cover has a lip, an ornamental design and a recess. The lip is shaped to form a seal with the inner primary housing. The recess is shaped to extend away from the lip and the inner primary housing when the two housings are operationally coupled. The recess is sized to accommodate a belt of up to a certain maximum width, for example a 3-inch wide toothed belt, and will therefor also accommodate a narrower metallic chain. The recess and the inner primary housing substantially form a pocket required to support the maintenance of the drive chain in an oil bath. When the motorcycle is modified to include a belt, the cover is modified by relieving material from the outer primary housing to form air path apertures that extend wholly through the cover.