I'm looking at a 1972 R75/5 to join the other bikes in my shed. The PO is asking $3500 for it. It looks to be in good shape. There's no rot on the tires, the battery is new, he has receipts for the last couple of sevice checks (he doesn't do his own maintenance).
Nothing is leaking from anywhere, it started up from cold after a couple of tries. The only things I noticed were the front forks seemed soft, the tach needle wandered and the oil light flickered when idling, once it got to about 1200rpm this stayed off.
I took it for a short test ride and the steering and gears seemed in order.
Anything I should specifically look for?