5.7 Engine with Carb

[seanpatsdad]

If the power is down,check the choke.I would not look at re-jetting.Probably something easier.Good luck.
John

[toelke4286]

Choke is working properly.

[seanpatsdad]

Have you owned the boat since new.If not are the mixture screws exposed or are they still covered with the factory plugs.It probably just needs some tuning of these.Here is a link to a very good guide to doing this.Hope it helps.Please keep us updated.
John
http://www.feather.us/2006/09/01/blo...-bleed-screws/

[barefooterh2o]

If the choke is open and you have black smoke, then you have an internal problem. Minimum you have either a power valve or accel. pump diaphram that is torn and causing gas to leak past, or internal gasket that is bad. The boat carb. is a little harder to rebuild than a normal 4 bbl.
If you feel comfortable, remove it and replace the power valve and accel. pump. Otherwise, let someone rebuild it that is trustworthy.
Buying a rebuilt unit can also be tricky since we see them come out of the box bad. A lot of times they are rebuilt on an assy. line and the internal settings, like the float, linkages, are wrong. Or try and buy new.

I'm a ASE Certified Master Technician, SAE Mechanical Engineer.

[toelke4286]

Power valve was replaced at the beginning of last season, it helped, but did not fix it. I guess I will move to the accel pump diaphram. I could not see the link for mixture screw adjustment, but have done that last season as well. I was doing some reading last night on the Holley site. I guess I will dig into this carb and figure it out.