Rebuilding the Zenith 04 Carburetor for your Model T Ford

The great thing about having a speedster; you pick the parts that you want on it. An aftermarket carburetor and intake are just the ticket – even the dog approves.

The Zenith carburetor company was large even in the earliest days. It was a very popular carburetor in both France and England for aircraft use in the earliest years. French inventor and tinkerer Francois Bavery “perfected” the Zenith design from his experiments in 1906 – 1908. His contribution was a dual jet design, with one main jet supplying the primary mixture to the throttle bore, and the other “compensator” jet being open to the atmosphere as a “compensator”, thereby offsetting the mixture as throttle position and engine speed changes. The theory is quite novel. A “cap jet” surrounds the throttle main jet, modifying both the vacuum signal and the fuel flow at various engine demands.

Francis (or Francois) Bavery’s design became the standard for many years at Zenith.

Zenith was never an OEM carburetor supplier for the Model T Ford. However Zenith made several accessory carburetors and carburetor / intake manifold combinations for the Model T Ford. We had a chance to rebuild one. Follow along and see how it went.

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