Re: Jubilee Timing; Stalls at Idle RPMs

Posted by Royse on September 17, 2013 at 20:40:19 from (69.36.58.178):

In Reply to: Jubilee Timing; Stalls at Idle RPMs posted by mrlewp87 on September 15, 2013 at 12:34:53:

MS = Marvel Schebler, the brand of the original carb.

If you have a replacement Zenith carb or something else,

adjustments will be different.

The circuits are fuel circuits as you say, not electrical.

This is simplified and off the top of my head, so consult a manual!

There are three adjustments. The idle speed screw which

should be fairly evident, it holds the throttle open.

The main fuel adjustment is the large thumb screw adjustment.

That one is used to adjust fuel flow under load and at higher RPM.

Then there's the idle air screw, which is angled in from the side.

This one adjusts the fuel at idle. It is backwards from most cars

and most other carbs for that matter.

Turning it out gives you a lean mixture/less gas/more air.

Normally it is in the neighbor hood of one to on and a half turns

out with just 1/16 of a turn making a difference in how it idles.

If it doesn't change anything, the carb needs to be cleaned.

Adjust this for the fastest idle, then turn the idle speed screw

down to get to a lower idle. Then do it again.

You may have to do it several times.

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