I know this doesn’t strictly apply but i have a 914 that will not start hot without a lot of hassle,
what i do now is before shutting down i allow the engine to idle for a minute then shut of both fuel pumps
down and allow engine to run until it falters then switch of the mags,
on a restart don’t touch the fuel pump switches, just start her, she will run a bit lumpily then flick the pump on then off then repeat as necessary until she runs smooth, this has worked with 40 C temps in spain, leaving fuel in the carb bowls above a hot exhaust is a recipe for localised vapour lock, but with empty bowls she will start fine,
obviously you cannot shut down the mechanical pump on the 912 so shut off at the fuel cock until she stops, my two cents worth,