4.3 OMC Cobra running rich

4Winns2

4Winns2

Petty Officer 1st Class
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Nov 2, 2006
Messages
327
I've been through the crap Seloc manual (I've got the OMC manual on my PC but haven't consulted it yet) trying to find an adjustment on my 2bbl Holley carb. When I put her in gear she coughs for a moment or two before I am able to get underway. Might be an ESA related issue but I can smell that she is running rich and want to adjust the carb for this. Any ideas on where this adjustment is a on the carb fellow boaters?
 
Idlespeedonly

Idlespeedonly

Senior Chief Petty Officer
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Jun 30, 2011
Messages
779
Re: 4.3 OMC Cobra running rich

Should be one on port and one on starboard. They are on the metering block right behind the bowl. A straight blade screwdriver is used.
 
4Winns2

4Winns2

Petty Officer 1st Class
Joined
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Messages
327
Re: 4.3 OMC Cobra running rich

Thanks. I believe I've seen them- -very thin flat head screws. Are they like a high speed and low speed jet screws? I would assume the low speed jet needs to be adjusted for a leaner mix.


Idlespeedonly said:
Should be one on port and one on starboard. They are on the metering block right behind the bowl. A straight blade screwdriver is used.
Click to expand...
 
Idlespeedonly

Idlespeedonly

Senior Chief Petty Officer
Joined
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Messages
779
Re: 4.3 OMC Cobra running rich

lowspeed only. The high speed are a fixed orifice. Keep in mind you could have a leaking power valve. Its a 10 dollar part. So its not a big deal either.
 
4Winns2

4Winns2

Petty Officer 1st Class
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Messages
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Re: 4.3 OMC Cobra running rich

Really appreciate your help on all this. I have never heard of a power valve. Is that part of the carb?




Idlespeedonly said:
lowspeed only. The high speed are a fixed orifice. Keep in mind you could have a leaking power valve. Its a 10 dollar part. So its not a big deal either.
Click to expand...
 
Idlespeedonly

Idlespeedonly

Senior Chief Petty Officer
Joined
Jun 30, 2011
Messages
779
Re: 4.3 OMC Cobra running rich

Yes.it threads into the metering block.
 
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