Your right its in a 3d plane, but I'm not doing any 3d mostly because the engine doesn't seem to be powerfull enough. WHen it started overheating, it was about 104 outside here in TX, but I had the better part of a gallon through it for break in before flying it, and I know thats not enough to really break it in but for the first 5 or so flights there were no verticle maneuvers, but still it obviosly overheated and puked as you say. So.... warp the piston? I would've thought it would warp the cyclinder instead of the piston. Either way, the cost of either/both will have me just buying a new (and bigger) engine.

I don't suppose there is a sure fire way to tell if the pison or cyclinder is warped?