I agree with striderjg. If you were running rich then the motor should not heat up enough to die no matter the damage. It is probably a coincidence that after tuneup the engine dies 10 minutes into a flight. see if there is fuel in the tank after 10 minutes. let it cool for awhile then try to restart it and fly a few minutes. my guess is that you have a small airleak in the fuel line or tubingeither inside the tank or outside. see if airbubbles are traveling in the fuel line. If they are they can lean an engine out in flight and overheat it and kill it too. If the leak is on the inside then it might not leak air until you burn enough fuel to get the fuel level so it is not covering the leaking hole. glow fuel causes brass tubing to go bad very slowly and also fuel tubing goes bad with age fuel and vibration. It is a good thing to check the fuel system on older aircraft. I have had to redo a few after about 2 years time. It doesn't cost anything to check it. If the leak is inside the tank, you can't check for a leak by seeing if the tank holds pressure because the leak is inside of the two ways for air or fuel to get in or out of the tank