I soaked the carb for 2 days, pulled it out today and did pretty much everything that was suggested here.
I used some stiff wire to poke out all the passages, followed that with spray carb cleaner in each passage followed by compressed air.
I set the float per service manual, I was very, careful and got it as close to perfect as I could. Installed everything and no dripping from the carb so the needle and seat are working correctly. Idle screw is set 1 1/2 turns from being seated.
Same old story. The idle screw can be seated or 6 turns out and it runs just the same. I even took the whole screw out and it ran, a little worse but not terribly so. It did hiss quite bit, if I put my finger over the it would change a bit.
I did a leak test, even went so far as to spray the whole thing down with either, no change what so ever.
I guess the last draw is to pull the Marvel off my BN and install it on the A, see what that does.
Just because I could I reset all the valves to make sure nothing was funky there. All the cylinders read 85 pound plus or minus a pound. I went thought the mag, new cap, point and timed it back. I also replaced all the spark plugs.
I keep coming back to the carb due to it's lack of adjustment, I guess trying another know good carb will tell me something.
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