Re: 1956 Oliver 5.5 hp won’t start

[frankr]

If you do pull the carb back off again, try putting the reed plate back on without the o-ring, just to see how far it has to go in to hit bottom. I’m telling you it has to go all the way in, still assuming it is the same as a Chris-Craft. Once you determine how far that is, you can judge how thick an o-ring it needs.

I suspect you are barking up the wrong tree, worrying about the idle circuit. even if the idle circuit is totally obstructed, it should start and run at high speed, just not idle.

And you are sure the ignition is ok, right?