That is kind of an open question. You never said what class your end goal was. That would be the major start. Tractor engines are no different than anything else.
- Displacement
- RPMs
- Fuel
- Timing
The first can get expensive. The second are not so bad. Most rules state an RPM limit. Don't run anything less and cheat them towards the high side. They usually give you 10% varience. Fuel - Matt Gall MoTec Engineering Tipton, IN Google him. He can open up the venturi and do some other magic. My SMTA is like another machine with the rebuilt carb. As for timing. I have no idea where mine is. It sure does start hard, but it lugs like crazy. I had a guy from my club time it and I didn't ask him what he did.
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Today's Featured Article - History of the Nuffield Tractor - by Anthony West. The Nuffield tractor story started in early 1945. The British government still reeling from the effects of the war on the economy, approached the Nuffield organization to see if they would design and build an "ALL NEW" British built wheeled tractor, suitable for both British and world farming.
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