Always hankered after one of those....
There was an identical CB400F at the Ringwood (Metro?) Honda dealer back in around 2008 /09. I went for a walk whilst getting some (Bike Mart - were they a sponsor of sort? - supplied) tyres fitted to the CB1300 (at the place over the road from Bike Mart).
Anyways, it got the juices started, but they wouldn't permit a test ride (it was on consignment), not really sure how they (dealer and / or owner) expected it to sell. The juices had to be stemmed, and they were a few weeks later when there was one advertised on Bikesales.com, I took it for a ride. It took less than a km to remind me how poor (by the standards of the day) the brakes were, how soft the front forks were, and how slow it was.
In 1976 though, stepping up from the TS185, it was a completely different matter.
