Until recently, most outboard motors were two strokes.  These engines were fitted with a carburettor and the design was fairly straight forward and simple. Nowadays, with all the emphasis on reducing pollution, two strokes are considered too heavy on unburnt hydrocarbons for todays’ world.

During the mid 1990s European directives and US exhaust emission laws made manufacturers change from two to four stroke engines. All the main marine outboard engine companies have now developed new four-stroke motors.  Most of these new engines are fuel injected apart from the smaller outboards, which still use carburettors.   Some models benefit from variable camshaft timing, and multiple valves per cylinder. Mercury Verado four-strokes are unique in that they are supercharged.

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