[j_cst_10]

Look down the carb when it is running. Make sure you don't have fuel dribbling out of the primary boosters. This can cause a rich condition and when it's hot and you shut it off it essentially acts like an engine that has been flooded, hence having to open the butterflies open with your foot tp start.

This can happen because of various circumstances, not all that are obvious. Float level and non functioning needle and seat are an example but can also happen if the primary butterflies are open too much with the idle screw (improper tuning) which leads to too much carb signal.

I've worked on a handful of engines that have had this issue. Let me know what you find! If it is this I can tell you things to check and ways to fix it