Re: 1962 18hp Johnson Only Runs With Choke.

[Don]

OK Mark, well let’s not go nuts changing seals just yet….
I would have a much closer look at that carb first…Was the carb gummed up when you rebuilt it? I’m assuming this carb has an adjustable high speed needle, not a fixed high speed jet, am I correct?
Where do you have the needles set at?
The low speed needle (top) is initially set at 1.5 turns out from gently seated
The high speed needle (bottom) is initially set at 3/4 turns out from gently seated
Are you sure the low speed needle tip is not damaged, perhaps broke off and stuck in the mixing pocket hole