+1 to what the dog wrote. Myself? I had a tiny itty bitty piece of paper towel sucked up on the right carb's main jet that would not let me rev above 4000 rpms.
I don't use lint devices anymore in that area...
Pulling the choke out when your sickle stumbles will help tell you if the issue is lectric or fuel.
Drain your carb bowls then remove the bowls and using a mirror look at the jets. Drop the jets too if you want. From what you describe though, it seems the culprit is on the main jet circuit. These are the tools needed to drop the bowls and jets.
