Seth, here is what I know. The jet itself is a press fit, no threads. it is a 1/8" (0.125) brass tube, with a 0.021 jet opening (#75 drill, hence the 75 on the part number) and a 1/16 (0.0625) id. The H and M jets would probably work, if you can thread the carb base. I'll have to look up the thread size again on the H and M jets. I also looked at using a Cub jet, and I know those threads take a 4-40 tap.
Lastly, there is a difference between a gas only carb and a dual fuel carb. That jet passes through a vacuum port. The gas only jet is a solid tube, and the dual fuel one has a port in the tube at 90 degrees part way up that opens into the vacuum port. I have a mostly intact broken one, and a NOS gas only one. I'll dig them out and get some specific measurements for you on the location of the dual fuel 2nd port, and also the overall length of the jet.
This post was edited by Tom Fleming at 02:47:51 09/05/14.
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Today's Featured Article - The 8N and the Fox - by Zane Sherman. Dec. 13 1998, Renfroe, Alabama. Last niht I dreamed about the day that I plowed the field of about 10 acres over on what Jimmy and Dandy called the Ledbetter field. I was driving the 1948 8N Ford tractor that Jimmy bought in 48 new This was prebably in about 1951 and maybe even befor the house was built. This would have made me to be about16 years old and I drove the tractor for nothing and would have paid to drive it if I had had any money which I didn't, but neit
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