Motorcycle Questions? Ask a Mechanic.
I'd suggest to remove the top of the carb and inspect the level of fuel in the float bowl
as it should be about 2/3rds full
if its too full it will flood the carb and stall the engine, if its too low then the engine will be starved of fuel
you can adjust the level by bending the tab on the back of the float where it rests on the needle valve that controls the fuel coming into the carb
If this is OK then I'd next remove the carb entirely and use compressed air or an aerosol of carb cleaner to blast through each of the jets and the air circuit as if they are even slightly blocked it will alter the air / fuel mixture
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