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dlamont
08-13-2013, 03:58 PM
Was out the other day skiing and boat was running great, then all of a sudden I lost all power and the boat died. Got it started but ran extremely rough and would only go about 5-10mph and I didn't want to push it. It was also running extremely rich and smelled like gas.
Got it out of the water to run on a fake-a-lake and noticed the butterflies were not opening.

I'm not a carb guy but does this need a rebuild? It's a 4160 Holley. The boat has ran great all summer till now. At least 60 hours since June.

Any help would be appreciated.

thatsmrmastercraft
08-13-2013, 04:43 PM
Sounds like the choke cap came loose or the spring inside the choke cap came disconnected. Loosen the three screws on the choke cap a little and try to turn the cap and see if that will open the choke. If it does, set the choke so it is lightly closed on a cold engine, and check to see if its fully opened after 90 seconds.

If the choke doesn't turn, remove the cap and look for broken parts.

You don't need to rebuild, just to get the choke working again.

dlamont
08-14-2013, 06:20 PM
great! I'll check that. Thanks for the help.

dlamont
08-15-2013, 12:10 PM
wasn't the choke cap. everything looked good there. Any other ideas?

tex599
08-15-2013, 01:32 PM
When mine was doing this the high speed jets were dumping fuel in the engine at idle. Float was stuck.

tph
08-15-2013, 02:13 PM
When mine was doing this the high speed jets were dumping fuel in the engine at idle. Float was stuck.

I had a similar problem a few years back. The front bowl floats weren't working properly because the circular cap on top of the bowl came loose.

thatsmrmastercraft
08-15-2013, 02:42 PM
Sounds like you are getting too much fuel. I would get it started and take a look down the carb and see if the fuel is spraying nicely or pouring in. Then shut is off and take a look in the carb to see if fuel is still coming through.

If the fuel is still coming in after you shut it off, you have a problem with the float, float adjustment, or needle & seat.

If it runs way to rich but isn't leaking after you shut it down, you likely have a blown power valve. Did it backfire shortly before it started running poorly?

dlamont
08-15-2013, 02:50 PM
no backfire that I can remember. Fuel is definitely pouring in not spraying.
I'll check on the float.

thatsmrmastercraft
08-15-2013, 02:55 PM
You may just have a chunk of crud keeping the needle and seat from closing.

When you have the bowl off, check the power valve. If you are holding it by the hex end, you shouldn't be able to turn the small end.

tex599
08-15-2013, 04:36 PM
Depending on how long it is has been since that carb has been rebuilt, you may have to upgrade to the new screws with the rebuild kit. The old screws have springs on them and are difficult to reuse more than a couple of times. Also make sure you get a marine rebuild kit, the automotive ones have the wrong power valve and a couple of mismatched gaskets.