You don"t say whether the needles are the solid type or the ones with the rubber tips. It seems to me like the sticking occurs more with the rubber tipped ones than the solid ones. I guess because the rubber will deform and stick in the hole to give a tighter seal they have a greater tendency to hold on even when the bowl is dry. That said if they have rubber tips why not look around and see if there are any solid ones available and give that a shot.
Too, while I"m a fan of Marvel Mystery Oil for many uses, I know Sea Foam seems to do alot better job for me on engines that set than anything else I"ve ever run across.
Barring anything else have you tried something simple like, after draining the gas, just give each carb a light tap to, hopefully, cause the float to drop and unseat the needle?
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Today's Featured Article - Good As New - by Bill Goodwin. In the summer of 1995, my father, Russ Goodwin, and I acquired the 1945 Farmall B that my grandfather used as an overseer on a farm in Waynesboro, Georgia. After my grandfather�s death in 1955, J.P. Rollins, son of the landowner, used the tractor. In the winter 1985, while in his possession the engine block cracked and was unrepairable. He had told my father
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