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 checks (if have not been done) is to carefully remove the sparkplug and check the burn color of the ceramic at the tip end. If very light brown to whitish, then lean and/or an air leak concern.
Additionally, ensure that the original air box + air filter/element is correctly installed with air entry only through the air box cover opening.