Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Unit construction is a term used to describe the design of larger motorcycles where the engine and gearbox components share a single casing. The term is sometimes applied to the design of motor car engines and was often loosely applied to motorcycles with rather different internal layouts such as the boxer twin BMWs.Prior to unit construction, the engine and gearbox had their own separate casings and were connected by a primary chain drive running in an oil bath chaincase. The new system used a similar chain drive and both had 3 separate oil reservoirs for engine, gearbox and primary drive.

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