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Is there any logic to the uneven firing order?
It just seems odd.
It's a necessity of the design. The pistons move back and forth on 180 degree crank throws for primary balance. Things are big and heavy and that was the least complicated way to achieve some semblance of balance. Any other crank angle would have required balance shafts
A really off the wall one is Yamaha going cross plane on an inline 4 cylinder to try to improve tyre traction...
https://www.youtube.com/watch?v=oEXUrO5wYcE
I guess like a lot of people here I get stuck in an automotive mindset.
For a tractor operating at slow speed, smooth application of torque is not so importand, as you can have a big heavy flywheel to even things out.
I a car such weight would be a deterrent, but in a tractor it could be an asset.
Would love to see some pics of the restorating when it was in progress