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Unread 09-08-2009, 07:30 PM   #1
camjeeper
Registered User
1991 YJ Wrangler 
 
Join Date: May 2009
Location: Medford
Posts: 23
304 Holley Carb Tuning

I have been fooling with my carb for awhile and have not really gained much so I figure I would post some specs and see if anyone has any suggestions.

This is a mild built 304 with a mild cam (not sure any spec's info from PO) Eldabrock intake, factory exhaust manifolds and custom 2" dual exhaust.

I have a Holley 600CFM 1850-3 Carb which now has 64 Main Jets, #65 PV and a black vac secondary spring. Checked vacuum at 13". I have set the bowls so a trickle comes out of the sight plug when rocked. I have not touched the secondary as it is my understanding on this carb it is a plate?

My problem is I am running rich at idle and at speed. I can smell gas all the time. Checked plugs and thy are a little black around the outside and dark brown in the center. I went down from 66's to 64's on the mains based on what the Holley instructions recommend.

Any suggestions would be greatly appreciated

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1991 YJ 4.0,Auto, 2" Rocky Road BB, 31X10.50 Hercules Trail Diggers on Factory 15X7 Steel
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Unread 09-08-2009, 08:56 PM   #2
texasimport
Registered User
1978 CJ5 
 
Join Date: Aug 2009
Location: Loveland, Colorado
Posts: 338
Just been getting a holley 470 truck avenger dialed in on the CJ I just bought for my son. Also edelbrock manifold as well. Start with your idle mixtures adjust screws on each side of your primaries. Turn each in a 1/4 turn and run it see how you feel/smell. Mine was at least a full turn to far out, made my eyes water. I also have ordered smaller mains. I was .057 moving down to .056, not much but lets see. I am at 5500ft so I for sure will run smaller than your .064s. Also if you have a vacuum gage some of the more skilled will chime in and tell you to use it and I think go for max vacuum when adjusting the idle mixture screws. Still others may tell you turn them in until it starts to falter then back out 1/4. If you can't get it with mains and the idle mixture screws then time to play with your power valve. The smarter guys will have to take it from here.
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78 304-CJ5
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