Well, just got back from measuring everything, all checks out. Carb checked in multiple areas, no problems. Electrical is working good, and compression is good. Still though, the idle, and the mixture screw are screwed in almost all the way in to keep it running. And, after running it for over half an hour(series of idle-medium RPM's), it for not apparent reason just starts to die, making yet again strange low-tone pinging noises while dying(like someone very lightly taping on the cylinder head with a small screwdriver). I believe it is overheating, but I don't think it should be. Can someone tell me how to break-in this engine properly, before I screw something up on it?