After the shop called me and said that the motor was blown i brought it home and decided to look at it myself to see if it would be worth rebuilding. The Top right piston is melted but none of the others are. They actually look good along with the cylinder walls and the heads. No groves or build up. there is a broken wire going to the motor temp switch on the right side u can see in the pics. I do not know if it has been broke the whole time or if it was broke when they took the head off at the shop. Since it is the only piston that is messed up i dont know what it is. In my little brain since it is a cross flow motor then if it was fuel/air problem then it should show on more than one piston. And the VRO pump is off and I mix 50-1. wut could be the problem? I dont know so any help would be awesome. Thanks in advance.