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In the Motorcycle World video on motorcycle engines, Kevin Cameron mentions the short combustion time in the Commando engine which is due to the flat-top piston, squish and the shape of the combustion chamber.  The ignition advance in the Commando engine is much less  than in many other similar engines, so less heat is lost from the combustion chamber.  Heat build-up is a problem in many racing engines. It is the main reason I always use methanol fuel when racing.