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Dirty Sanchez
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 Post subject: location of A/F screw, with pic
PostPosted: Wed Jul 20, 2011 6:39 pm 
I don't know how many times I've seen people ask about the location of the air/fuel mixture screw. I just happened to have a carb torn down on my workbench, so I slipped it back together and took a pic. The screw is normally D-shaped, I'd already cut a slot in this one so I could use a screwdriver on it.

Clockwise gives you less fuel (leaner), counterclockwise=more fuel (richer). Factory setting is 2 1/4 - 2 1/2 turns counterclockwise from fully closed.

Hope this is helpful..... :highfive:

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 Post subject: Re: location of A/F screw, with pic
PostPosted: Thu Jul 21, 2011 9:51 am 
I like the cut. I have been using bic pen caps with the tapured cap not the fat black one. The i break the little circle out of the end. heat the end you just modified with a lighter untill its soft. Then jam it into the D screw hole and be super still so the plastic can set good. The you can use this as your air screw tool for free.

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 Post subject: Re: location of A/F screw, with pic
PostPosted: Thu Jul 21, 2011 1:25 pm 
:shock:

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 Post subject: Re: location of A/F screw, with pic
PostPosted: Thu Jul 21, 2011 1:28 pm 
Was there any gain in performance? I've heard its pointless to mess with. Jetting is the key.

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Dirty Sanchez
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 Post subject: Re: location of A/F screw, with pic
PostPosted: Thu Jul 21, 2011 3:14 pm 
Robomod wrote:
Was there any gain in performance? I've heard its pointless to mess with. Jetting is the key.


I just adjust it to get the idle as smooth as possible. The way I understand it, it only affects performance noticeably from idle up to maybe 5mph. It's the LAST thing I adjust after rejetting.

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Junior Mint
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 Post subject: Re: location of A/F screw, with pic
PostPosted: Mon Jul 08, 2013 11:29 am 
so it's fuel screw or air screw? are you adjusting the quantity of fuel or the quantity of air?

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Dirty Sanchez
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 Post subject: Re: location of A/F screw, with pic
PostPosted: Mon Jul 08, 2013 11:52 am 
srinaldi wrote:
so it's fuel screw or air screw? are you adjusting the quantity of fuel or the quantity of air?


Both, which is why its called Air/fuel Mixture screw
by going in all the way your allowing less fuel more air, by opening it up more it allows more fuel less air. So you have to find the middle balance.

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Dirty Sanchez
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 Post subject: Re: location of A/F screw, with pic
PostPosted: Mon Jul 08, 2013 12:09 pm 
oldfart55 wrote:
Robomod wrote:
Was there any gain in performance? I've heard its pointless to mess with. Jetting is the key.


I just adjust it to get the idle as smooth as possible. The way I understand it, it only affects performance noticeably from idle up to maybe 5mph. It's the LAST thing I adjust after rejetting.


Actually it affects your jetting by a little bit too... I've messing with mine and if you go too lean/rich your midrange gets affected. And if I am not mistaken slim had said its sort if like your SJ adjustment. If you have a 38sj and if you had to lean it more than a turn then your better off running a 35 with a slight richness.
So in other words it can make your 35 run like a 36sj, maybe even as far as 37......
Also on a side note if you mess with your idle it will throw off your A/F mixture, if you had it right on.

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Dirty Sanchez
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 Post subject: Re: location of A/F screw, with pic
PostPosted: Mon Jul 08, 2013 7:35 pm 
I agree, it does affect midrange more than I used to realize. I wrote that 2 years ago, I've learned a little since then. :wink:

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Cleveland Steamer Hander Outer
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 Post subject: Re: location of A/F screw, with pic
PostPosted: Tue Jul 09, 2013 6:10 am 
Alex06Ruck wrote:
srinaldi wrote:
so it's fuel screw or air screw? are you adjusting the quantity of fuel or the quantity of air?


Both, which is why its called Air/fuel Mixture screw
by going in all the way your allowing less fuel more air, by opening it up more it allows more fuel less air. So you have to find the middle balance.

Im not sure how it can restrict air, and allow more fuel.

All it does is allow more or less fuel. It controls the fuel leak that consistantly flowing.

Dont see how it can restrict how much air flows.

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Dirty Sanchez
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 Post subject: Re: location of A/F screw, with pic
PostPosted: Tue Jul 09, 2013 9:43 am 
ConElite wrote:
Alex06Ruck wrote:
srinaldi wrote:
so it's fuel screw or air screw? are you adjusting the quantity of fuel or the quantity of air?


Both, which is why its called Air/fuel Mixture screw
by going in all the way your allowing less fuel more air, by opening it up more it allows more fuel less air. So you have to find the middle balance.

Im not sure how it can restrict air, and allow more fuel.

All it does is allow more or less fuel. It controls the fuel leak that consistantly flowing.

Dont see how it can restrict how much air flows.


The little hole on the left side of the intake runs to the SJ and runs through the A/F then comes out after the throttle plate.

So by opening the screw your allowing more fuel to go through the needle with less air in that passage. Now if you screw it in more, then your restricting fuel to go through the A/F and allowing more air to go down the manifold. Its pretty simple really, its a chain of effects.

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Cleveland Steamer Hander Outer
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 Post subject: Re: location of A/F screw, with pic
PostPosted: Tue Jul 09, 2013 9:57 am 
Fuel leaks thru those pin holes by vaccum. No air flows thru that port if im not mistaken. But if it does its so small its not noticeable. Its to decreasing or increasing the amount of fuel leaking into the air flow thus making the mix lean or rich.

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Dirty Sanchez
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 Post subject: Re: location of A/F screw, with pic
PostPosted: Tue Jul 09, 2013 10:21 am 
ConElite wrote:
Fuel leaks thru those pin holes by vaccum. No air flows thru that port if im not mistaken. But if it does its so small its not noticeable. Its to decreasing or increasing the amount of fuel leaking into the air flow thus making the mix lean or rich.


Its not a massive amount of air but some air does go through from the vacuum and then the fuel is leaked down the manifold, etc....

your making it seem like I'm saying fuel or air, gets cut out of the equation....

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Junior Mint
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 Post subject: Re: location of A/F screw, with pic
PostPosted: Wed Jul 10, 2013 2:39 pm 
That's a good clean cut in the screw head.

I butchered mine -- made the slot so wide the screwdriver would barely bite. I eventually ordered a replacement screw, and when ordering some jets from JetRUs, I added on the 6mm socket D-driver for $3 <--- linky.

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