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The company revised production in 2007 and now selling two-stroke and four-stroke models.
en.wikipedia.org Motocross engines are usually single-cylinder two-stroke or four-stroke units, which vary in size from 50cc up to about 650cc.
en.wikipedia.org For example, the 360 twin is the natural configuration for a two cylinder four-stroke engine, since four piston strokes add up to 720.
en.wikipedia.org Various models feature four-stroke engines ranging in displacement from 80 to 125 cc, a kick starter, and telescopic shock absorbers.
en.wikipedia.org Motorcycle engines may be two-stroke or four-stroke internal combustion engines, but other types have been used in small numbers.
en.wikipedia.org