Motorcycle Questions? Ask a Mechanic.
Hi and welcome to JustAnswer, I’m Louie. Sorry you had to wait awhile but I’ll do my best to help.Initially, have you checked the burn colors of all the spark plug tips? ...cleaned them or better yet replaced recently?
Yes please and an update when able.
Drain each of the carb bowl separately top a suitable container through the drain hoses by loosening the bottom drain screws.
This would allow checking and comparing fuel quantity and quality of each carb.
Of course the prescribed approach is carb pulldown for soaking, cleaning, float check/adjustment and possibly balancing.
Good luck and thank you for the opportunity to share the information.