zenith carb fuel dribble

[mak]

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 .

mak

[mak]

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 .

[Ritchie]

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.

[mak]

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.
mak