I think it comes back to this crappy stuff they sell as "Gasoline". This stuff is NOT formulated to run in Carbs. It boils and causes hot start problems. :burnout:MT
I have the same (irritating) problem with my 273 Commando, 1406 eddy. Cold it starts up immediately. Hot, just the slightest opening of the throttle, then open more when it starts firing. I've been through it all...rebuilt carb, plugs are great, wires are new, running a Pertronics, about 15* initial, 34* total mechanical.
Speaking of starters, my original was starting to go so about 3 weeks ago I went to the junk yard and pulled a mini starter from a Ram 1500, 1996 I think, and bolted it on. Works great, but I sure miss the sound of the ole gear reduction. It had the plastic wire connector so I had to splice it. A different starter will not help the hot starting issue though.
