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zenith main jet question

Farmall Super A, AV, 100, 130, & 140 1939 - 1973
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artc
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zenith main jet question

Postby artc » Sun Dec 29, 2013 9:57 pm

the Zenith carb I have to go on my super A has a #20 main jet in it. it will only run decent with the choke half closed - increasing the venture flow. the service manual calls for a #18 main jet for that carb. is that a larger jet, like in wire gauges?
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Re: zenith main jet question

Postby Eugene » Sun Dec 29, 2013 10:19 pm

http://old-carburetors.com/1927-Dykes/1 ... es-064.htm

Don't know if the above post will help. Near the bottom of the 1st page, references to a chart listing diameters of main jets. I didn't go any further than the first page.
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Re: zenith main jet question

Postby Barnyard » Sun Dec 29, 2013 10:30 pm

Art, the higher the number, the bigger the hole. For example, a Honda motorcycle would use something bigger like between a #110 and #130.
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artc
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Tractors Owned: Restored: 1950 Cub, 1950 Cub Demo, 1948 super AI, 1935 Silver King, 1946 Oliver 60 RC, John Deere M, 1950 C demo.

In working clothes:
1950 cub, 1948 cub, 1941 A, 1948 H, 1963 B414, 1958 240U, 1947 Oliver 60 industrial, Oliver 70 industrial. IH 450, 1963, another 1948 cub, 1946 I6 with Trogan front blade.
Location: CT, Middletown
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Re: zenith main jet question

Postby artc » Sun Dec 29, 2013 10:35 pm

actually, that did help. the jet size is the number X 5/100, expressed in millimeters. so a #20 is larger than a #18.

thanks
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artc
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Tractors Owned: Restored: 1950 Cub, 1950 Cub Demo, 1948 super AI, 1935 Silver King, 1946 Oliver 60 RC, John Deere M, 1950 C demo.

In working clothes:
1950 cub, 1948 cub, 1941 A, 1948 H, 1963 B414, 1958 240U, 1947 Oliver 60 industrial, Oliver 70 industrial. IH 450, 1963, another 1948 cub, 1946 I6 with Trogan front blade.
Location: CT, Middletown
Contact:

Re: zenith main jet question

Postby artc » Mon Dec 30, 2013 5:47 pm

but I think I need a #22 or so for this application, even though the service manual calls for an 18. i'll experiment a little
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Re: zenith main jet question

Postby Boss Hog » Mon Dec 30, 2013 6:24 pm

2 words Drill bit :D
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Re: zenith main jet question

Postby Cecil » Mon Dec 30, 2013 6:59 pm

I've drilled jets before. Works good.

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artc
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Tractors Owned: Restored: 1950 Cub, 1950 Cub Demo, 1948 super AI, 1935 Silver King, 1946 Oliver 60 RC, John Deere M, 1950 C demo.

In working clothes:
1950 cub, 1948 cub, 1941 A, 1948 H, 1963 B414, 1958 240U, 1947 Oliver 60 industrial, Oliver 70 industrial. IH 450, 1963, another 1948 cub, 1946 I6 with Trogan front blade.
Location: CT, Middletown
Contact:

Re: zenith main jet question

Postby artc » Tue Dec 31, 2013 9:58 am

a good excuse for me to get a set of numbered drills :D
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Re: zenith main jet question

Postby Bill Hudson » Tue Dec 31, 2013 10:45 am

artc wrote:a good excuse for me to get a set of numbered drills :D


Art,

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