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Zenith Stromberg Running Lean - Up-date

RandMeyer

Freshman Member
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Zenith Stromberg Running Lean - Update

Since my inital post, I've done quite a bit of work, but still have the lean mixture problem based on the lift the piston test and driving. I rebuilt the carbon cannisters to address the charcoal in the anti run-on valve and put the old mixture needle back in as suggested, but it's still running lean based on lifting the piston (almost stalls with minimal lift). In the meantime I put in new points, distributor cap and condensor and set the timing at 15 degrees BTDC to no effect. After all this, it does idle smoother & consistently, but you can still feel the hesitation at speed while driving. I can't find any vacuum leaks using carb cleaner and pulling the vent line to the carbon cannisters doesn't change the idle as it did before. I also adjusted the mixture needle all the way clockwise to no effect.

I've run out of options to try next. Thanks for your advice.
 
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