Well, the NSR has direct links with the RS, or should I say the RS has direct links with the NSR so is pretty much based on a GP motor..

The RGV, well thats based on... er... well.. Im sure its based on something but whatever it was it wasnt up to much lol

RGV or NSR to win, depends how well each has been maintained, but a dog of an NSR will out last a dog of an RGV.
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If I have to take the carbs off once more...