Duster Ignition problems when hot

What happens if you just wait 20 to 30 minutes?
If it fires right up now, then your fuel system is probably just fine.

If you cannot trace it to ignition, I would normally recommend an engine LeakDown test, but in this case, with the lights dimming thing going on, I would suspect the starting system. But since this is an ongoing problem, I would suspect the pistons are swelling up in the bores. This happened to me, with KB 107s. The spec is .0015 to .0020. I was already baggy at .0020/.0025. I gave her another .001 and that was the end of it; But I run a minimum water temp of 205*F. Your results may vary.