The most popular repower for older hydrostat garden tractors is the Briggs Vanguard, followed by the Honda engines.
If you are stuck on a diesel, you might look for ideas at a 332, which is a little Yanmar diesel in the same footprint as the 317. I know a couple guys have put Kubota engines from refrigeration units in garden tractors but I don't have a link to give you.
Re: JD 317 Repower in reply to smokeshow, 11-21-2012 07:26:31
A good machinist could drill the crank you have but you still wouldn't have much oil flow or pressure. A Magnum 18 is very similar to a Phase II KT-17 with electronic ignition. That's an easy changeover.
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