stewmills
Serious Thumper
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Imagination is more important than knowledge
Posts: 2641
Auburn, AL
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Yeah, you definitely got a unique one there. Not that it makes a difference, but if you weren't the first owner maybe the PO did something to booger it up. If not and you opened up the plug and have always been careful with it, maybe you got a carb that was cast with a flaw and they didn't care because they were plugging it and thought it would never matter.
I would suggest only putting the first bit of RTV on the screw where you think it will contact the threads in the carb body. If you try to goop any RTV in the carb body first you risk pushing some of the RTV into the air/mix hole down in the carb and you don't want that. I think even without any RTV on the threads it would hold with a glob packed in behind the screw, but I like your idea of trying to put a little on the threads.
One other thought would be to source a small rubber o-ring that is a hair larger than the one that is currently on the air/mix screw that would hold a bit more pressure on the screw IF you can wedge it in there, but there is already not much room and the stock o-ring fits in there kinda snug so you may end up making matters worse. Probably good to stick with the RTV.
FWIW, yours should look like this, with the o-ring, washer, spring, screw.
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