I thought that indent was for the sparkplug? Or is there a littlequote:
was running great was as Pete T. said "Knock, knock... who's there? Detonation. The compression ration was a bit high for long Daytona straights. The piston looks good minus a chunk missing.
Ah, I see. All these four-stroke pistons look the same to me...quote:
Look at the photo again.
At the top of the image, on the thrust face side of the piston, next to the bottom of the intake valve relief is a chunk missing. If you look close you can see the compression ring through the hole.