okay so Update, I was looking through the manual trying to find if the part number for the ring was listed and the manual had a strange fix that ended up working. The manual said to put a drop of smoke fluid on the o ring and its brass fitting, this worked fine and it is now not leaking. The smoke unit is pretty loud on this engine so I was planning on opening it up and oiling that I will check it there is anything in the tube connecting the smoke unit and whistle to see if anything is stopping the flow of smoke.
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