Hey! Someone harpooned your tractor!!!!The KT19 was just bigger option of the KT17, which most have gone this direction. Most say second series was better, but I don't believe that, have seen same on those. Wasn't till later models had oil filter that they got it right, then diff name for them. I once bought a PK with one, ran fair. Fella even delivered it and ran it to drive off trailer and all. Later on tear-down found same Big hole in case and little if no oil in it!! I pulled the head and had a yardstick poking between the hole and the bore.