The Ford Barn

Kirbsterbbq · 09-14-2016, 02:17 PM

Greetings all!

I am looking for parts for my 124 1/2 carb, I did rebuild it once but i used other Zenith carbs off Model B cars.

What I am looking for is larger jets and venturi.

My parts catalog says the following jets are to be installed

Compensator No. 23
Venturi No. 24
Idling Jet No. 12
Cap Jet No. 23
Main Jet No. 25

This Carb is on a 1935 Twin City Tractor.

ursus · 09-14-2016, 02:32 PM

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I think you will want the # 19 main jet from a Model A or #20 from a Model B. Your 24mm venturi is plenty wide as the Model A was 20mm and the Model B was 22mm. The largest venturi I have seen that would fit that carb was a 26mm. Zenith even made some for the 124 series carbs as narrow as 15mm or 17mm, for low speed stationary industrial engines.

09-14-2016, 02:17 PM	#1
Kirbsterbbq Junior Member Join Date: May 2016 Location: Stacy, Minnesota Posts: 1	Zenith 124 1/2 T.O. Carb Greetings all! I am looking for parts for my 124 1/2 carb, I did rebuild it once but i used other Zenith carbs off Model B cars. What I am looking for is larger jets and venturi. My parts catalog says the following jets are to be installed Compensator No. 23 Venturi No. 24 Idling Jet No. 12 Cap Jet No. 23 Main Jet No. 25 This Carb is on a 1935 Twin City Tractor.

09-14-2016, 02:32 PM	#2
ursus Senior Member Join Date: May 2010 Location: Oregon Posts: 1,375	Re: Zenith 124 1/2 T.O. Carb Sponsored Links (Register now to hide all advertisements) I think you will want the # 19 main jet from a Model A or #20 from a Model B. Your 24mm venturi is plenty wide as the Model A was 20mm and the Model B was 22mm. The largest venturi I have seen that would fit that carb was a 26mm. Zenith even made some for the 124 series carbs as narrow as 15mm or 17mm, for low speed stationary industrial engines.