Once when my buddy owned a KR with a type IV, it developed a slight vibration (not nearly as harsh as yours) which was more noticeable at certain RPMs. After tearing it down it turned out to be slightly worn wrist pin bushes. After replacing them, it was good as new again. Just a thought. Regards Dene Collett South Africa KR2SRT builder mailto: [email protected] www.whisperaircraft.co.za
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