Motorcycle Questions? Ask a Mechanic.
I'd say you're on the right track. I'd drain the fuel from everything first and see if it clears up before removing the carb. It could just be water or debris in the fuel.
If that doesn't fix it then pull the carb and tear into it.
I hope this helps. Please let me know if I can be of further assistance. Thanks, P.J.
Sounds good, best of luck!
If fuel all is well in the carburetor then you could have a leak in the intake manifold or anther vacuum port open.
It could also be an ignition issue, bad plug or wire, coil, etc.
It could also be something mechanical such as a sticky lifter or a valve seating problem. There are many possibilities that would cause sputtering and/or misfiring while running.
It can be tough to find. Please let me know if I can be of further assistance.