The only reason 2s has the advantage in dirtbikes is because of the weight savings, both in physical size/weight of the jug, and it's moving mass- I think the 2storkes are easier to fling around corners. Plus the 4-strokes make torque off longer stroke, making for a taller jug, higher COG, etc. On ATV's I think some of that stuff is less of an issue. I could be wrong, but I don't care.
Digi: My first experience taking sportbikes offroad was when you were 7 years old. Don't get too ahead of yourself mate.
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