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  #1  
Old 2 Weeks Ago
Doc308 Doc308 is offline
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Default Zenith carb question

A Zenith carb came installed on the '69 XLH which i just purchased. The idle is i8ncredibly rich to the point of loading up and fouling the plugs. I've looked up how to adjust the carb and have run into conflicting advice regarding the idle adjustment screw. One source says that turning it in leans it out. Another source said that turning it in richens it. Which is it???

Also there are 2 adjusting scews on the top of the carb. I assume that the smaller one, closer to the manifold is the idle mixture screw. The larger one toward the front of the carb is what- an idel tube or main jet?

The bike revs and runs great but the idle is super rich.
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Some carb brands are backwards from other brands on the mixture screw.

We have a lot of Zenith/Bendix carb information in the XLF Sportsterpedia
Here's the main page:
http://sportsterpedia.com/doku.php/t...972-early_1976

See this page for tuning and adjustments.
http://sportsterpedia.com/doku.php/techtalk:ih:carb01m

Turned in (clockwise) will lean the mixture.
Turned out (counter-clockwise) will richen the mixture.
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Take a look at needle and orifice condition if you dont get any response from adjustments
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Quote:
Originally Posted by Hippysmack View Post
Some carb brands are backwards from other brands on the mixture screw...
To expound on this, it all depends on what the mixture screw is controlling. On the zenith carb that screw controls gas flow. Screwing it in, as said, reduces fuel making the mix leaner where on a mikuni vm 38 it controls air flow, so that it reduces the air flow through the pilot jet and makes it richer.
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Quote:
Originally Posted by Doc308 View Post
Also there are 2 adjusting scews on the top of the carb. I assume that the smaller one, closer to the manifold is the idle mixture screw. The larger one toward the front of the carb is what- an idel tube or main jet?
Please post a pic. We really need to see a picture of what you have.

The alleged "screw", closest to the air cleaner, may just be the fixed idle tube. Or it might be the version with the adjustable main jet. Which one you have, without a pic, is a crap shoot for us
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The large one should be the main jet, see Adjustable Main Jet Zenith/Bendix.
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I have difficulty posting photos on this site. Anyway, to clarify, this is the smaller screw close to the intake manifold. The larger screw , closer to the air cleaner, has a spring under it as well so I assume from what I hear, that this is an adjustable main jet screw.

Thank you for the input, guys--very helpful as usual.
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I have 5 bikes with adjustable mains, 2 are ironheads, on both the adjustable main is out 2 1/2 turns from spring bind, the pilot jets are adjusted at idle for best idle, if a overly rich condition still exists the "O" ring on the main jet is toasted, the 9/16 head center bottom of the bowl is the main jet. the adjustments will work if the float height is set correctly and float spring is correct.
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Thanks, Randy.
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