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Old 10-08-2010, 11:07 AM
mak mak is offline
Join Date: Jul 2006
Location: Westfeld .
Posts: 687
zenith carb fuel dribble

230S. 111 fintail with zenith 35/40 INAT carbs.

The front carb has a small dribble of fuel drops from the atomizer area ,quite similar to a leaking needle valve . What could cause it ?
To verify the operation of the needle valve i swapped it with rear one still the occasional dribble. The rear carb works fine with no dribble .

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Old 10-21-2010, 11:02 AM
mak mak is offline
Join Date: Jul 2006
Location: Westfeld .
Posts: 687
As mentioned by the Forum adviser ,the fault lies in a clogged air channel to the idle system ,causing the pre atomizer to dribble fuel as fuel is pulled in from the main jet .
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Old 10-26-2010, 01:33 PM
Ritchie's Avatar
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Join Date: Jun 2010
Location: Richmond, Texas
Posts: 223
My front carb had a blockage here.
67' 250S Vent hole on Carb Question

These are great little carburetors when they are right. Hang in there.
1972 250C (Sold)
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Old 11-01-2010, 06:34 PM
mak mak is offline
Join Date: Jul 2006
Location: Westfeld .
Posts: 687
Ritchie .
Thanks for the information. Yes it seems a buildup of deposits here does cause the infamous zenith stalls and rough idling.Best cleaned by removing the plug,Any suggestions for re-plugging it.
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