With the way it pushed that fire ring out the top of the cylinder it might be a good idea to put a straight edge along the top of the deck and check how far down that piston is compared to the other cylinders. You may have bent a rod.
GC340 your right, I checked the pistons, the other three are .050 in the hole and this one is .090 in the hole. I guess there's a bent connecting rod here. Thanks for having me check that.
