Motorcycle Questions? Ask a Mechanic.
Hi and welcome to JustAnswer,Thank you for the question and your patience. Should you still need assistance for information purposes only...Initially, proposed preliminary try would be to clean the air filter/element and ensure no air leak. Then full attention to the fuel tank and the internals of the carb assembly to remove dried fuel deposits, gunk and varnish like buildup. Of particular effort into soaking of metal parts using carb cleaner. In some instances, it may be necessary to use a repair kit of sorts for the carbs. The jets / holes would need special cleaning tools.
Perhaps the videos HERE and HERE would shed additional insight.