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Welcome to GTT
I don't know the answer to your question but from the way the crankshaft is built with only 2 journals for 4 piston rods I'm guessing 2 cylinders fire at the same instant but I will do some research.
 

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Here's some info from one of the most informed person on 2 cyl JD's I've ever had the privilege to read. There's also some more info by another well informed JD person on a thread authored by me on Yesterday's Tractor John Deere forum.

HTH's,Jim
 

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Yes they fire at the same time.

The R pony is different because it was a 2 cylinder and the only one that Deere produced like that, all the numbered series diesels got the v-4 pony.
 
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