j911brick wrote:I'm not totally sure on the NSR, but on other bikes we have just added washers under the needles. The HRC recommended needles are suppose to be the same profile as the stock needles, except with grooves.

The 'B' HRC needle for the MC21 has a similar profile to stock but not the same and the A and C needles are quite different.
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NSR300R - Why did i ever have a 250...