I replaced the four cylinders on my engine with new Millenium units in September. During the first ten hours the vibration personality of the engine seemed to change several times. There was never a vibration that worried me but there seemed to be differences on each flight. If you ballance the prop now you may be confused in the results until the engine settles down. After fifteen hours the engine seems pretty much the same each flight and not much different than what I remember from before changing the cylinders. Good luck with your new engine. Bob Condon
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