I looked around, couldn't find anything on the power jet size per application.
I found this listing that offered several sizes. They sound big though, probably for adjustable mains.
There are several suppliers and rebuilders online. You might make some calls, see if they have the info or an professional opinion based on engine size.
You may have to make a guess, start small and buy a set of jet drills, work it up .001" at a time until it will take responsive throttle without hesitation.
I did see the designation "A" indicates fixed jet.
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Today's Featured Article - A 1937 John Deere Unstuck - by Gary Hickman. Here is my story of how I got the pistons out of a 1937 JD B that the engine had been stuck for about 14 years: About 12 years ago my Dad gave me one of the tractors I ran as I was growing up on our farm in central Nebraska. The engine on this tractor, a 1937 John Deere "B", had been stuck for 2 years before he gave it to me. This last spring (1999) I hauled the tractor to our 2 acre lot in St. Libory Nebraska where it joined my antique machinery collection, at that time a 1929 Caterpillar T
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