audiomick Posted February 6 Report Share Posted February 6 Dunno about a "sweet spot", but Ernst (who really does know what he is talking about, far more than me....) mentioned a crucial point. He suspected con rods heavier than spec. You wrote about having changed the pistons. Both of those (can) mess up the balance of the motor, and make it vibrate (and in the worst case, self destruct.). As far as the conrods go, if one were to suspect that as an issue, one would have to find out the correct weight and weigh the ones in the motor. As far as swapping the pistons goes, I would weigh the old ones and the new ones. If there is any difference, the crank should be re-balanced (as far as I know). Same goes for swapping the conrods... 2 Link to comment Share on other sites More sharing options...
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