when you did th carb did you…inspect and confirm that the side channel feeding the upper low speed chamber was clear… not certain but I think there is a small jet in the upper half of the carb look closely
if so run a VERY fine wire to clean any varnish crud blow it out with carb cleaner and air pressure with the needle out so no junk will enter the drip chamber
also did you inspect the HS nozzle tube and clear any crud from the side hole allowing fuel to better vaporize
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