The Ford Barn - View Single Post - Zenith

nkaminar · 06-06-2021, 05:06 PM

John, Below from http://model-a.org/symptoms.html which is a good site for the Zenith carburetor. You are running too lean. If you cannot fix it they have a rebuilding service.

Mixture lean and over heating

Common Causes

Float is set too low.
Lower Casting Bowl Passage is restricted to Main Jet & Drain Plug.
Compensator Jet Orifice contains dirt or rust, or is too small.
Gasket at Main Jet is too thick or multiples are used, resulting in tip being too low.
Main Jet Orifice contains dirt or rust, or is too small.
Upper Casting Fuel Line Passage is restricted to Float Valve via Filter Strainer.
Lower Casting Comp. Jet Passage is restricted to Cap Jet via Secondary Well.

06-06-2021, 05:06 PM	#19
nkaminar Senior Member Join Date: Jan 2012 Location: Western North Carolina Posts: 3,897	Re: Zenith - 1 Carburetor John, Below from http://model-a.org/symptoms.html which is a good site for the Zenith carburetor. You are running too lean. If you cannot fix it they have a rebuilding service. Mixture lean and over heating Common Causes Float is set too low. Lower Casting Bowl Passage is restricted to Main Jet & Drain Plug. Compensator Jet Orifice contains dirt or rust, or is too small. Gasket at Main Jet is too thick or multiples are used, resulting in tip being too low. Main Jet Orifice contains dirt or rust, or is too small. Upper Casting Fuel Line Passage is restricted to Float Valve via Filter Strainer. Lower Casting Comp. Jet Passage is restricted to Cap Jet via Secondary Well. __________________ A is for apple, green as the sky. Step on the gas, for tomorrow I die. Forget the brakes, they really don't work. The clutch always sticks, and starts with a jerk. My car grows red hair, and flies through the air. Driving's a blast, a blast from the past.