Hi from sunny South-East Pennsylvania. I had a CB400 F0 in the late 70's and 'upgraded' her to a Yoshimura 460. Dropped a tooth off the drive sprocket and went kerb-crawling and back-road thrashing (This was in England).
STILL the most fun bike I ever owned.
Just acquired another (I swore I wouldn't buy yet another bike but...) and am 'upgrading' her back to USA factory spec's (my God that's an in-your-face rear light!) and found this wonderful site.
Took her out for a run yesterday evening and had my first dormant muscle-memory moment when I tried to put the lights on and... WTF!
Here's my Dear Santa SOHC/4 wish list -
http://www.pipeburn.com/home/2015/11/30/1927-windhoff-750.html