Thankfully it's not mine Ron..From a friends bike...The valves got tangled, one snapped and went stem first through the top of the piston getting itself thoroughly embedded...The remains of the stem are visible on the underside of the piston crown...The result of tuning, excessive thrashing and 'red mist' syndrome....Apparently it was pretty noisy and caused some mayhem in other areas....Quite impressive I thought so I grabbed the unwanted piston as a workshop 'ornament' to go with my broken conrod collection...:fearful: Ian