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Unread 01-18-2014, 04:05 PM   #1
ChrisCarlock
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1982 CJ7 
 
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Fine tuning Carter Carb

I have my stock carter carb. I'm doing fine tuning on it. This might just be a common sense thing but my carb isn't being logical.

I turned screw all the way in, and let idle on warm engine. I then turned one out until it sputter and then turned back towards lean a whole turn.

Then I did the same on the left screw. It wouldn't sputter when turned all the way out. Is this normal?

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Unread 01-18-2014, 04:19 PM   #2
seabass1858
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This is what I found work for me after I rebuilt mine. I turned them both all the way in then both 4 turns out from a cold start. Once warmed up and I felt my timing was set to my specs, I would play with both of them until I had the engine bogging down and I would back it off until it idled fine +1/2 turn. I then tested the throttle response and did the same. Also keep in mind I had a vaccum gauge while doing all of this and maintaining a 20hg at idle. This is what worked for me and ive tuned a good bit of carburetors. I also nuttered mine too.
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Unread 01-18-2014, 04:23 PM   #3
ChrisCarlock
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Thank you!
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Unread 01-18-2014, 07:49 PM   #4
86cj74.2L
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Quote:
Originally Posted by ChrisCarlock
I have my stock carter carb. I'm doing fine tuning on it. This might just be a common sense thing but my carb isn't being logical. I turned screw all the way in, and let idle on warm engine. I then turned one out until it sputter and then turned back towards lean a whole turn. Then I did the same on the left screw. It wouldn't sputter when turned all the way out. Is this normal?
If it runs with one screw all the way in then either the other one is backed out way too far, there is still dirt in a passage.

A carter with zero vacuum leaks on engine will have the screws at or around 2 1/2 turns. Any settings beyond 3 1/2 its going to effect carburation and off idle response.

Or the there is still dirt in there.

Have you tried shooting carb cleaner through your emulsion tubes?

Johns fingers not mine.
image-1603021774.jpg

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Unread 01-18-2014, 08:52 PM   #5
seabass1858
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Quote:
Originally Posted by 86cj74.2L View Post
If it runs with one screw all the way in then either the other one is backed out way too far, there is still dirt in a passage.

A carter with zero vacuum leaks on engine will have the screws at or around 2 1/2 turns. Any settings beyond 3 1/2 its going to effect carburation and off idle response.

Or the there is still dirt in there.

Have you tried shooting carb cleaner through your emulsion tubes?

Johns fingers not mine.
i drilled these out as will as a precaution. #67 hobby drill bit and dremel
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Unread 01-18-2014, 08:57 PM   #6
LumpyGrits
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There are [B]2[B]idle mix screws on the Carter. BOTH must be turned the exact same amount.
If it's a BBD, with all the OEM stuff hooked up then the exact mix is controlled via the 'puter.
IF, it is still run'n rough-My bet is a micron of crud is block'n the idle air-mix tubes.
This site will help you......
http://home.sprynet.com/~dale02/list.htm

LG
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Unread 01-18-2014, 09:14 PM   #7
86cj74.2L
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Quote:
Originally Posted by seabass1858
i drilled these out as will as a precaution. #67 hobby drill bit and dremel
I actually think it preformed better after drilling out those emulsion tubes. (Comparing to other carbs I had in it) But its hard to say because that carb on Grammys CJ came off a gremlin. And I totally gone over it and drilled out the tubes before first fire, and after the rebush of the throttle shafts it was back to brand new specs.

IF you find out your tubes are clogged, as your CJ sits more than its driven its something to do. When the gas evaporates from the fuel bowl it leaves orangish-brown granular debris behind.

Verifying your fuel screws are evenly set and idling. If you see fuel dripping out of the Venturi cluster they are clogged.
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Unread 01-18-2014, 09:17 PM   #8
seabass1858
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Originally Posted by 86cj74.2L View Post
If you see fuel dripping out of the Venturi cluster they are clogged.
This is the exact reason for me drilling them out
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