Because this is the UK, NSR's here are mega rare, RGV's, RS's (Aprilia ones) and KR1's (and the KR1S) were all available here officially as were early TZR's. Add to that the RGV boys are claiming 70+bhp with ease and you begin to understand the problem.
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Please do not PM me technical questions, if you can't find it on the Forum start a thread