Super a zenith carbuertor

gidtex

Member
Idle mixture screw has no affect on
engine,carbuertor has been cleaned, also
check for vacuum leak recheck float setting
carbuertor has adustable main jet.could
manifold have a crack between intake and
exhaust.this ia a zenith. Motor has been
rebuilt.
 
"Cleaned" or not, it still could have a clogged passage or two.

Also, suspect a damaged venturi that's not sealing to the carburetor body in the gasket area.

Dunno about this one, but in some carbs it's even possible to install the venturi upside down.
 
Idle mixture not working is not necessarily an idle circuit issue, if the engine is running so poorly that the throttle is opened enough, it may be running of the power circuit and ignoring the idle circuit.
 
(quoted from post at 16:25:39 05/25/18) Idle mixture not working is not necessarily an idle circuit issue, if the engine is running so poorly that the throttle is opened enough, it may be running of the power circuit and ignoring the idle circuit.

That is true!
 
I use a vacuum gage to diagnose most engine issues. Brass plug must be vertical mine is not.
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One issue ?
The very small hole in the idle circuit is plugged possibilities. Use a pin vise and a number 60 drill .040 to clean it.
Rebush the throtle shaft .
I think any Caburetor can be fixed up
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