An early motorcycle engine architecture where the engine and gearbox are built as independent casings, with their own oil reservoirs. (Compare unit construction).


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  1. Unit Construction : Motorcycle-Glossary.com on May 21, 2007 2:50 pm

    [...] both the engine and gearbox are integrated within the same casing.  Earlier engine design was a pre-unit construction where engine and gearbox were in separate [...]

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