Carburetor issues

My 82 nautique runs rich at low speeds and idle. I had the holley 4160 rebuilt some time ago. Having realized it was most likely set up in a level position on a bench. It seems likely that the floats are not set up to match the 15 degrees the engine sits at at idle or low speeds. Is it likely the float setting could be the culprit. Other ideas are welcome. If it is the float level how is it to be set up since it is an internal float set up.?And how much need it be adjusted? Thanks in advance for helpful ideas and input .Brian

If the float adjustment was too high you'd have lots of fuel dripping down the primary venturis and more drivability issues than just a rich mixture.

At speed the carburetor is still at about the same angle as when it's idling.

There's really no "special" adjustment needed for the mounting angle Any PCM manual has the float level set up just like an automotive application.although some people like to adjust the primary bowl float a little lower

In 82 they had the internally adjustable floats which means you have to take the float bowl off to do it.

The older ones that BB12 refers to could be externally adjusted

Before doing anything with floats, I'd make sure the idle mixture screws are set right and that you're actually idling on the idle circuit..

A good starting point for the mixture screws is 1 1/2 turns out from seated.

You can do a CCF search on how to adjust them or read a Holley manual

Lots of info here on the website

Somebody might mention a blown power valve causing issues like this also but that's not too common at all unless you've had a big backfire through the carburetor, then it's a "maybe"

And like BB12 said make sure your ignition system is working as it should.

restored82 wrote: The jets are set at 2 1/2 turns by mechanic

Brian,
Do you mean the idle mix adjustment like Ken mentioned?

KENO wrote: Before doing anything with floats, I'd make sure the idle mixture screws are set right and that you're actually idling on the idle circuit.. A good starting point for the mixture screws is 1 1/2 turns out from seated. .

Did your mechanic use a vacuum gauge per the Holley instructions?
Take a look at the video and note what problems can be caused by a bad idle mix adjustment.