I may have a pic of it in an early 1970's issue of Motorcycle Sport Quarterly but that isn't where I am at the moment. When I go to the other house I'll look for it.They all look like (too much) fun. That's some no-nonsense gusseting in pic #1; never seen anything quite like it. I'd like to see the '58 with the gas tank off, can you put up a photo without inconvenience?
Elektron, might you have a photo of the Yetman frame? I'd "research" it myself, i.e., root around online, but my fingers were missing when I got up this morning.
An acquaintance here in south FL built a 250 cc Brand S monocoque road racer. Another one campaigned a Yankee 500 twin road racer. Friends of mine bought the east coast Yankee distributor, including complete bikes, parts, and the Full Bore line. The bike in the lobby where the business was in Schenectady NY was a brand-new Dick Mann Replica flat tracker. I still have a very-serviceable Full Bore enduro jacket, before the use of slip-in pads/armor, I bought from them.Sure does/has. Bookmarked for leisurely perusal. Thanks, Elektron.
That's a nice reminder of how seriously racers took the little-engined classes way back when. Some of the wildest engineering came out of 50-175cc racing!