I'm adjusting the valve lash on my engine as I have restarting running the engine in warm to hot weather needing to let the engine cool off. I heard heat expansion of the valves can have them stay open too long. Only reason why I mention is that my arm trying to restart the engine had in the past been exercised beyond belief.
Oh of course I will be measuring the gap again, but I let it be even when I first got the used engine as it ran, and you know, if it ain't broke don't fix it rule.
Also not likely for my engine is a weaker spark when the magneto gets hot. I have heard of that too. The engine I guess gets hotter than when it is being run. The latent heat from within the cylinder and no electric fan like on new autos, that causes problems in this case.
A so so spark eh. I have heard that if you can crank the engine fast enough and you have the spark plug still in the cylinder with that spark tester connected in parallel, and you see a spark in the tester, you for sure have enough juice.
I have seen ads in many auto parts stores online showing those tester for cheap less than 10 to maybe 15 at most. An adjustable calibrated dohicky to use while the plug is out, an easier pull, or in your case foot crank.
You had it better, I was in the woods with 95 degree heat and trying to see if it would restart after cooling an hour. Some times I was a bit far from camp. Nice though that there are some if not just infrequent passing by of the ranger or those living in the National Forest Lands. A guy was going on a diesel fuel run for his generator, as they have no electric lines, and offered me a ride back to my camp. I offered some compensation brew, but he was happy to help and not but 2 miles out of his way.