What could have caused this? I just bought this banshee ( didnt pay very much for it thank god) and took it out for a spin after getting it running and it ran pretty good except it had a bog when out of the power band. So I decided to tear it down and this is what I found. One piston has a dent in the dome and is actually cracked on the inside of the piston, and it has extensive scratches in the jug. Haven't got the case apart yet to see what all is in it. Rod bearings seem to be in good shape, It has Vito's pistons, cool head with 22cc domes, the rest I have no clue. Here is some pics.
http://www.flickr.com/photos/15592546@N08/show/