bad starter?

so im lookin at this 1983 yamaha. ive been lookin at it for a while and when i told the guy to start it up the starter acted like it wasnt catching. it would turn over once or twice then sould like it was spinning unrestricted as if it had slipped off the flywheel. then when he let of the push button starter you could here the starter wind down and then make a few metal scraping noises as it came to a halt. is this just a stripped starter cog or a stripped flywheel lol or both. is it costly to repair??? thanks

yeah im gonna make an offer and if he doesnt accept then its back to the papers. but how deep into the bike is the starter is it something an inexperienced person could do? i guess i should get the shop manuel if i get into that thanks guys ill reconsider buying the bike and definitly tell the guy to lower the price.