So I finally had time today to pull the motor and check the squish and cylinder bore size. Found a big surprise when I took the head off. Somthing went threw the motor. I can't believe it still would fire up and run. I knew the compression was low just by the feel when kicking it over but I did not expect this. When I removed the cylinder I was surprised to find that there was no noticeable damage on the bottom end. It was like whatever went threw the motor did not go in threw the bottom end. The bottom of the piston had no marks from impact. The crank and rod didn't show any sighns of impact either. The top ring was broken where the ring end gap is on the exhaust side. I think the piston ring end gap pin fell out of the piston. I have herd of this before on snowmobiles. But yea the cylinder is the standard 86mm bore. I also noticed that there wasn't any piston thrust washers. There is no way they broke of because there would be damage under the piston. It's like someone replaced the piston and didn't put them back on. Here are some pics I took along the way. I'm not to upset because I am only into it $200