Ron67
actually from what I have read the ym 1700 have a common problem with running hot and blowing the head gasket, it would be a 50% chance that the gasket would be all it needs, depending on how hot it got? and how smart someone was when they noticed it over heating and shut it down,
I would find out if the previous owner was the one it run hot with? or if he purchased it this way with plans on repairing it and perhaps found more then he wanted wrong with it.
I still have fresh in my mind that a few months ago a Ym1700 went up for sale on the CL with the same "blown head gasket " problem, and was being sold as a parts tractor, I actually inquired about a part to buy from this 1700, but the complete tractor had already been sold,
Not saying this is the tractor your talking about, but I would try to find out?
a tractor with only a blown head gasket is no big deal to change but if more has been damaged do to being run hot? like crack head/ block, then it is in fact nothing more then a parts tractor,