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Did you replace the o-rings on the mix screws?
If you verified the pilot jets match, it seems a dirt/varnish problem if they are synced, the timing is the same left and right, the floats are the same left and right, the manifolds don't leak, etc. etc.Stock filters, stock exhaust, went up to 145 pilot.
Carbs were completely rebuilt in spring (when bike was bought after sitting for 10 years).
I am also a new guy trying to learn these things. This forum has been super helpful.If you verified the pilot jets match, it seems a dirt/varnish problem if they are synced, the timing is the same left and right, the floats are the same left and right, the manifolds don't leak, etc. etc.
I only recently synced my carbs. Guess what an idiot I am. After rides this past 8 or 9 months I often checked 1 plug, alternating left and right assuming both cylinders were working the same but the sync was way off. Foolish me to assume. I am an armature but learning.
SeaFoam will be a tank full or 2 before you get useful data. SeaFoam is a solvent(naptha, Stoddard solvent or some other short chain hydrocarbon), kerosene/diesel for lubrication and an alcohol to absorb moisture. If there is a jet blockage in the pilot circuit it will take a few miles to dissolve.i have checked valves all seem good.
I’ll give mixture screw o-rings a try, along with some sea foam.
I think I’ll go back to the 45 with 2-2.5 turns out for now.The BS34's are on the lean side with 42.5, but should not be too lean for stock bike with 3ish turns out on the fuel screws. You mentioned stock pilot screw: do you have aftermarket screws? It also should be close with 45 pilots and 2ish turns on fuel screws.
I think, given your symptoms and carb adjustments to date, I'd be curious to verify compression (leaking valve face) and ignition timing (on right side particularly) with timing light to verify your gonzo set-up is good.