Sorry I don't have an answer but I am having the same type of problem. I have a 95 xcr 600 and when I rev it to engage it it hits kind of hard. I replaced my belt and that made a big difference but it didn't fix it, I also cleaned my rollers and replaced the weights next I am going to try to shim my belt side clearence. Have you checked your belt clearence or is your belt worn out.
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