I do know the differance between an RS and a NSR, and im willin to put work into a 300 kit. Its what i do for a job.

Im sure with alittle work a 300 NSR will beat, hands down, nearly any 250 NSR. If it will ever beat an RS250 is another thing, but they should end up being close.
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If I have to take the carbs off once more...