Buz,
I'm "bored" with the BTR labels too. 99% of the time, in the MC world it's a sportster that has, at best, 70's styling or, on these sites, a rockabilly-looking cantilever frame with the bars flipped. Neither has any soul of a BTR IMO. My goal, if you find my blog, was to build a bike proportional to the real thing - to break the mold typically used on these sites. The engine wouldn't have mattered but in the spirit of originals, it had to be a twin. HP-wise, I think the power is close to many of the period(though not the Cyclone at an estimated 45HP!). I cant recall but the formulas based on HP and gearing yielded a theoretical top speed of 80+ mph. Again, not something of the 80cc world.
Nonetheless, I have yet to hear the comment that the 80cc engines are too modern looking on a this type of site - they are the mainstay. I honestly think this engine looks no newer. Have to wonder if you would have made that comment if I had plopped the typical 80cc in there. I also have not searched for your projects so I'm not sure of your abilities. Touche'.
Honestly(and somewhat arrogantly), if I were to spend the money on a period motor(and considered it), other compromises would not have been made in the overall design, the whole thing would have been taylored around that, and you certainly wouldn't have seen the thing posted on this site!
BTW, what on this thing does look practical?
Dave
KC