Black smoke is from too much fuel. I think it's going lean. May not cut out, but would limit RPM. Plugged main will do it.
I don't think your issue has anything to do with heat.... I think it's time ran.
The starter kicking out is also a common problem of a Mag/ KT. Usually you need some lube on the starter. A lot of time it's caused from the engine trying to start then doesn't. Again, you can replace if you want.....
I agree with Roland about cleaning it all up. Never a bad idea to do that.
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