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hey i just got my new 4 wheel atv action (september issue). they say they've seen and hear pre prodction models. they say its a 4 stroke in the 500cc range.
If all you want is to keep up or beat the 400ex, then why did you by a 4x4? Trade it in on a 2x4, its lighter, less power loss through trans, and has no trouble with the ex.