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Hello,
Here is a picture of the second stage of the Zenith carb (upside down). The red arrow indicates the "hidden horizontal passage" It is directly below the vent hole. It is a low spot in the idle circuit. Crud can build up in here. If it is plugged, the idle in this carb will not function. You will see a plug peened in place, where the manufacuturer drilled the passage. In severe instances I have had to drill out the plug, clear the passage and re-plg the hole. Just make sure the passage is clear by blowing air through it. If not clear it.
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Joe Alexander
Blacklick, Ohio
1964 220SE Rally (La Carrera Panamericana someday)
1966 Unimog 404s (Swedish Army)
1969 300SEL 6.3 (sold)
1969 280SL Pagoda
1973 280SEL 4.5
1974 450SLC FIA Rally car (standard trans)
1982 300D turbo (winter driver)
1986 560SEC
1989 Unimog FLU419 (US Army)
1991 300TE (wife)
2002 SLK 32 AMG (350 hp)
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