Something reminded me of this photo recently and I was able to find it just now with a quick search. It’s a Honda S90 with a fully custom tube frame and a front brake from a CB160. I think the carb is probably a dell’orto. What’s interesting is that the exhaust looks stock. I wonder how much head work was done. I also love how the builder left the stock tank and seat on it. With that frame, the bike probably weighed damn near 200 lbs.
The S90 was my first street legal bike, and while I probably only rode it for less than 100 miles before I blew it up with an open exhaust, I loved it. That’s why this photo filled me with lust when I first saw it. I really oughta get mine back on the road.