Welp sorry need a bit of a correction, excuse me for using mechanic brain and going a bit too quick sometimes.
Internally all fe290d engines are the same.
The output shaft is the difference.
John deere has a 1:30 taper if i remember correct and then you have all kinds of tapers for different set ups.
This would not really matter for a rebuild kit but does matter when replacing the whole engine.
Now you can source a couple of engines through the internet and also some upgrade engines with a bit more horsepower.
This requires a bit of looking around and iam hoping people here can chime in on this
Thing is that at work i just do original stuff and at home i only do the special custom stuff, my gator ts has a 50hp engine in it so anything between that is a grey area
Edit: trying to keep it short isnt my thing sorry but i guess it is best to first of all open up the engine and see what the problem is.
If its the bore thats worn its a big job, maybe oversized pistons, boring etc.
Look i absolutely hate engine jobs because they cost time and even though i dont get payed per job this still sucks because noone wants to be the guy that works on the machine that costs the company money because its a trade-in or something.
For me that means pressure for someone who does it himself this simply means money.
I remember a customer coming in with a ferris once that ran pretty decent but the customer said it lost power.
Turned out one cyllinder completely exploded and it was still running decent for some unholy reason.
The damage was so bad that we scrapped the thing
So do yourself a favor, open it up, decide if its worth it and go from there.