Great find...Too bad the guy died and never did anything with them. One of my bikes I rode as a kid was 1941 ULH side valve 80” flat head Harley Davidson with a ridged frame. At 85mph, the motor was barely turning over.
Nowadays? I have a few classic Yamaha’s, such as the first dual sport enduros, like a 1969 Yamaha AT1 and a 1970 Yamaha CT1B to ride and mostly play with and restore.
I love the classics, but just for strictly riding and having real fun, I got a good deal on a Yamaha dual sport, single cylinder XT250. On or off road, it’s just pure fun. No kick, just electric start, lightweight, quite, good suspension and great engine clearance and air cooled with no radiator! These bikes with basic maintenance simply run and run and run. Not to mention the XT250 are probably the best looking dual sport in their class.
I have a 72 BMW R-75/5, its called the “toaster” because of the stainless steel side panels on the tank. It runs like a dream.