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Jim <br><br>Many Thanks for your knowledge. If I understand what you are saying I could alter the rotating mass (pistons, rods, etc) and not remove the issue but it would possibly move to a different RPM range.<br><br>The vibrations is very minor and goes just as quick as it comes. Only a very very ...

Hi There (Great Site)<br><br>Was wondering if anyone has sonme information about the vibration in the yzf100r thunderace ('97) at approx 5000rpm. I have seen a few people talk about it in other areas but no-one seems to know why it happens.. Just really curious as I have only just bought the bike a ...