AMF did inherit HDs problems but did nothing to correct them. Instead they bought more companies that were totally unrelated to their core business.
They bled money and sales during the time they held HD because the bikes were no better and probably worse because they didn't invest in the company.
They sold HD in 81 and in 85 were taken over and reorganized, selling off unrelated businesses.
You're right they did inherit problem and made it much worse. They shipped bikes 2/3 assembled, I mean 2/3 of the parts. They were junk. the castings weren't milled smooth which is one reasons they leaked so bad. Had it not been for the fact is was a Harley, which was the bike to have, they would have gone under right there. The name Hardly Driveable for HD came about at that time. AMF should have stuck to making bowling balls. I owned a AMF Harley, 1976, biggest piece of junk I ever owned.