Zenith 161 Idle Fuel Pickup Passage - Size

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   The 11141 carb on this CA I am going through has the threads stripped out for the main passage plug. I have a pretty rough 9705 carb (from a C, I suspect?) that I was planning on stealing the bowl from. I'd swap the threaded main jet, well vent, etc. parts over from the CA bowl to the C bowl, and then use the original CA throttle body.
Then I noticed that the idle fuel pickup passages drilled into the bowls are different sizes, and the CA/11141 has a brass orifice installed. The C/9705 has no orifice. Since the drilled holes are different sizes the brass orifice from the CA would not fit into the C bowl.

How important is this orifice? I would've thought this was mostly irrelevant as the idle jet sizing controls flow into the throttle body. However... I also doubt Zenith put that orifice in there just for fun and extra cost.

CA/11141 carb:

C/9705 carb:

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wjohn Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Joined: 19 Jan 2010 Location: KS Points: 2311	Post Options Post Reply Quote wjohn Report Post Thanks(0) Quote Reply Topic: Zenith 161 Idle Fuel Pickup Passage - Size Posted: 3 hours 45 minutes ago at 11:11pm
	The 11141 carb on this CA I am going through has the threads stripped out for the main passage plug. I have a pretty rough 9705 carb (from a C, I suspect?) that I was planning on stealing the bowl from. I'd swap the threaded main jet, well vent, etc. parts over from the CA bowl to the C bowl, and then use the original CA throttle body. Then I noticed that the idle fuel pickup passages drilled into the bowls are different sizes, and the CA/11141 has a brass orifice installed. The C/9705 has no orifice. Since the drilled holes are different sizes the brass orifice from the CA would not fit into the C bowl. How important is this orifice? I would've thought this was mostly irrelevant as the idle jet sizing controls flow into the throttle body. However... I also doubt Zenith put that orifice in there just for fun and extra cost. CA/11141 carb: C/9705 carb:
	1939 B, 1940 B, 1941 WC, 1951 WD, 1952 CA, 1956 WD-45

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