I have a KT-17 Series I pulled out of my 81 317 that has the exact same hole in the exact same place.i spent some time poking around a 317 i got last sunday. i managed to reclaim a corner of the shop to work on it this winter.
looking for a good engine for it.
Gentleman I bought the tractor from had a house on a hill and what I would consider to be a fairly steep front yard...… guess what happened??
I plugged the hole with some weld stick and ran it on one cylinder for awhile. Found a Series II to replace it.
Good luck with your search, they are out there.
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