thanks for all the helpful advice, everyone.
just to clarify, it gets too hot to touch in one minute when at full throttle, in neutral, mower not engaged.
in trying to figure out where to start on the "stall under load" problem, i removed the air cleaner and filter and ran it, stalled about one minute after mower engaged.
i believe i ruled out air intake problem.
next, i sprayed carb cleaner into the carb throat when it started to stall, still stalled. carb cleaner had no effect.
i believe i ruled out fuel delivery problem.
now, before i get into carb adjustments,timing, points etc. i am thinking a degreasing is my next step, to see if that cools it off.
since i do not see the crankcase breather you are talking about, i will guess it is buried and plugged.
the engine is greasy.
im just trying to figure out where to start.
i think degreasing/ cleaning the cooling fins will be first.