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[QUOTE="David Trustrum, post: 139179, member: 21529"]
Hmm, any blueing at the rod end would indicate overheating but that would not appear the case.

Something has travelled from the bottom end up the transfers & strangely it jumped out as the piston was at the top of its stroke & was dragged down the bore between the piston.  (Usually is pushed out on top of the piston).

If it is not still in the bottom end then presumably the second attempt it made it through complete & found an open exhaust port.  Usually they like to bounce around in the head to damage that for a while before disappearing.  This may all happen in a matter of seconds.

Damage to that part of the bore will cause minor powerloss due to pumping inefficiency but more likely as it should damage/ stick the ring in place.

The noticeable vibration & where the debris came from is a mystery & one I would not like to gamble another top end on.  I would pull the bottom end & check the alignment of the crank & replace the mains as a matter of course.

Let me know if you find anything else.
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