Synching Carbs - Mercedes-Benz Forum

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post #1 of 3 (permalink) Old 07-20-2009, 05:39 PM Thread Starter
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Synching Carbs

I'd like to learn how to synch and adjust my Zenith Carbs. Had them rebuilt and synch'd a year and a half ago and have since put less than 200 miles on. But it's been suggested that they get adjusted.

I know I need a unisync and this link seems to present a clear guide for calibration.

I can usually crack a manual and figure it out, but knowing how complicated the carbs are I'm wondering if this is reccomended from senior members. It looks like I can do it, but assuming this is typically my first mistake.
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post #2 of 3 (permalink) Old 07-20-2009, 06:39 PM
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Why do you think they need to be re-synch'ed? Did the rebuilder not do it right? Once done "correctly" they should never have to be done again, unless someone messes with something. Example: My Dad bought a new 250S in 1967. It was given to me when he passed, and I have now given it to my son. It has never had to have the Zenith's re-synch'ed and, so far, all carb. work needed has been done without having to remove them. Good, dependable units, IMO.
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post #3 of 3 (permalink) Old 07-21-2009, 06:06 AM
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Good advice

If your carbs were properly sync'd when you had them rebuilt, and they are now out of sync, something else is wrong. Likely culprits are a vacuum leak or a plugged idle circuit on one carb.

Chuck Taylor
Falls Church VA
1998 SL500
1959 220S
1970 280SL
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