That's a clever way to lower the seat! Most Japanese folks are shorter, so the 750 was always hard for them to ride.
I remember when, in the 1970s, the Tokyo Police were riding in groups of 3 riders, one (the head of the trio) on the 750, the '2nd' on a 450 twin and the '3rd' on a 350 twin. Someone brought me a picture of it for my shop. This was their patrol group: I always wondered how they might have kept the 750's plugs clean in constant city traffic?