i had the exact same issue after i rebuilt my 56 235
engine started REALLY easy without choke when cold and ran fine but once warmed up it would stall on idle (but ran fine otherwise)
i fixed it. the solution was either the fitting of a new coil (old one caught fire) or tuning of the carb idle valve. my money is on the carb tuning but cant say for sure as i changed both simultaneously
i tuned the carb by buying a cheap tachometer and using that to monitor the rpm wile adjusting the idle screw together with the idle fuel adjuster, engine warm. i managed to set the idle at the correct value circa 500rpm with the idle fuel valve adjusted so that any tigher drops the rpm and any losser has no effect. in other words i minimised the idle fuel metering to match idle fuel needs (at 500 rpm)
it solved the problem so my best guess is i had too much fuel at idle which was good when cold with no choke but bad when warm.
i think the idle fuel valve and idle speed needs to be set on a warm engine - when cold you use the choke to adjust. in my case the engine was set so it could run fine cold without choke...which was fine until it was hot then stall on idle
ymmv
Last edited by Drmike; 05/11/2015 9:45 AM.
