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 - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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