In a two-stroke engine, two strokes is one cycle. In a four
stroke engine, four strokes is one complete cycle. A stroke is a
part of a cycle. Remember that the "up" motion and the "down"
motion each count as one stroke.
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The Ottoman Cycle
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Yes, "four cycle" and "four stroke" are the same. The two terms may be used to describe an engine. As a rule, the term "four stroke" is more commonly used.
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Four-stroke lawn mowers have a tube where you add oil to the
engine. On two-stroke engines, oil has to be added to the fuel.
(Four-stroke and two-stroke are also called four-cycle and
two-cycle, respectively).