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seeing as most modern 1000cc 4 cyl bike engines are quite caperable of producing 150bhp then i would say 300 should be fairly easy to achive with a turbo, it seems to me that whatever power can be got out of an engine in naturally asparated form its possable to double it with a turbo assuming you can keep it in one piece, that said most bike enines are supremely tough in the first place.
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