DUH!!!!! Thank you. I knew it was the trainer system thing and even got the flywheel and three bladed prop with it. It just didn't occur to me that is what "TPS" meant. I also got the regular thrust washer in a sealed bag. I will be removing the flywheel and using a two blade prop in the future. I also have a couple Tower mufflers. One of them might fit. This might turn out to be a good find. The engine was gummed up from non-use, but the piston was still bright and shiny. It has not been run much.