Note this caution regarding the washer INSIDE the Main Jet...
"CAUTION: Both the fixed jet and the 1/2" hex-headed plug of the needle assembly have hard washers to seal them after installation. Use care in removing the original fixed jet so as to not lose the original washer. If the original washer remains in the carburetor instead of coming out with the jet, it's usually preferable to leave it in place and save the new washer for a spare. Do not end up using both small washers behind the fixed jet."
(From the instructions for installation of adjustable main jet)
Worth checking if that washer is in place.
I think the washer you are referring to is this one? (see pic).
The MAIN PASSAGE PLUG.
"CAUTION: Both the fixed jet and the 1/2" hex-headed plug of the needle assembly have hard washers to seal them after installation. Use care in removing the original fixed jet so as to not lose the original washer. If the original washer remains in the carburetor instead of coming out with the jet, it's usually preferable to leave it in place and save the new washer for a spare. Do not end up using both small washers behind the fixed jet."
(From the instructions for installation of adjustable main jet)
Worth checking if that washer is in place.
I know there was a small washer on the main jet, but the plug does not have one.
The MAIN PASSAGE PLUG.
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