I have pics of two pistons in my photo gallery, the third piston is still in the engine. Both pistons have broke in the same manner. I have been filing the rings for each hole and made sure that is the hole they go in. I went with Silv-O-Lite pistons this last time because my machenist said he would stand behind them. I haven't tore the engine down after this third time but I know this is what has happened to them ( spark plug smashed flat). I'm going to try it one more time later this month, and if it don't work this time, I may have a crank for sale.

Kodiak