A single cylinder, internal combustion engine with a dry sump lubrication system. The engine includes an engine housing in which the overhead camshaft and crankshaft are rotatably supported, and the housing includes an integrally formed cylinder and head. A timing belt disposed externally of the engine...http://www.google.de/patents/US5979392?utm_source=gb-gplus-sharePatent US5979392 - Overhead cam engine with integral head
