 brain cramp help, carb confusion! |
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| iankarr |
 May 8 2016, 08:26 AM
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#1
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The wrencher formerly known as Cuddy_K  Group: Members Posts: 2,482 Joined: 22-May 15 From: Heber City, UT Member No.: 18,749 Region Association: Intermountain Region 
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Hi Guys,
This is going to be the stupidest question I've ever posted, but I'm sure it will get the quickest answer... When adjusting the idle mixture screws on a Weber, does screwing in = leaner, or out? I don't know why I can't wrap my head around this...or find a simple answer online. The short bus is stopped outside my house. |
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| rhodyguy |
May 8 2016, 08:38 AM
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#2
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Chimp Sanctuary NW. Check it out. Group: Members Posts: 22,098 Joined: 2-March 03 From: Orion's Bell. The BELL! Member No.: 378 Region Association: Galt's Gulch |
Turning the screw in shuts off the fuel for that idle circuit. As the cyl goes lean you'll hear it and prob note a stumble.
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| iankarr |
May 8 2016, 08:58 AM
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#3
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The wrencher formerly known as Cuddy_K Group: Members Posts: 2,482 Joined: 22-May 15 From: Heber City, UT Member No.: 18,749 Region Association: Intermountain Region
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Thanks!
So....in=lean, out=rich? |
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| rhodyguy |
May 8 2016, 09:07 AM
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#4
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Chimp Sanctuary NW. Check it out. Group: Members Posts: 22,098 Joined: 2-March 03 From: Orion's Bell. The BELL! Member No.: 378 Region Association: Galt's Gulch |
Yes. Only gently seated when turning in. DON'T reef on it. Examine the needle tip. A grove can form from excessive pressure. Refer to the CB weber book. It's a great asset for understanding how the webers work and setting them up.
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| porschetub |
May 8 2016, 03:08 PM
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#5
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Advanced Member Group: Members Posts: 4,708 Joined: 25-July 15 From: New Zealand Member No.: 18,995 Region Association: None |
From memory its around 2 and one half turns out,if your idle jets are in the ballpark that is.
I have found in the past if the idle jets are wrong the mixture screws don't respond to adjustment as well or you could have a vacuum leak. |
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| Darren C |
May 8 2016, 03:26 PM
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#6
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Member Group: Members Posts: 392 Joined: 26-December 14 From: Chichester UK Member No.: 18,255 Region Association: England |
2 1/2 out will get you up and running but it'll be too rich, so dont leave them there too long.
As Rhody guy says, wind them in maybe 1/4 turn each (all at the same time initially from the 2 1/2 starting point and see if it still runs ok (should do) Then turn in each slowly (individually) until you hear the cylinder "drop out", then back out maybe 1/8 turn from drop out or until that cylinder fires smoothly. You can get it pretty good using this method, but to be most accurate you'll need a gas analyser to get the CO at between 2.5 & 3%. Another easy check is go for a ride and see what color the tail pipe is. Black= Too Rich. White= Too lean. Mid Gray is good |
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| iankarr |
May 8 2016, 07:37 PM
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#7
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The wrencher formerly known as Cuddy_K Group: Members Posts: 2,482 Joined: 22-May 15 From: Heber City, UT Member No.: 18,749 Region Association: Intermountain Region
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Thanks Guys. I got it running pretty well. Carbs balanced and the new Tangerine Racing linkage is huge. Almost done and ready for the summer.
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| stugray |
May 8 2016, 08:18 PM
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#8
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Advanced Member Group: Members Posts: 3,825 Joined: 17-September 09 From: Longmont, CO Member No.: 10,819 Region Association: None |
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