I second richening the main jet.
I always set the main jet by opening the throttle wide open with the mower engaged and then adjust the carb by best sound. Rich/lean/rich. Find where it runs best then richen about a quarter turn.
May not be the right way but it's worked for me for years and I've never melted a piston.
This may not fix your problem but if you're really short on time, it just might get you by. Or you can run with the choke partially on. Not a good idea but that works too.
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