Thanks for the reply, that makes sense. I put a scope in the cylinder last night and from what I could see it's full of carbon deposits. I'll pull the header off like you said to see how much I can clean it and recheck the clearances. The bike also sat last year so you're likely right on point...
Hi all, I have an issue with cylinder #3 plug getting fouled at idle with black soot, not wet with gas, dry soot.
- plugs 1,2,4 look good with a tan brown color, not lean or rich.
- carbs were sync. and the mixture screws are at 2 turns for all 4. The bike actually likes 3 turns for all four...