8. 1923 Scott Sprint Special
A 596cc, liquid-cooled, twin-cylinder two-stroke with automatic oil injection and rotary intake valves would still be considered relatively modern even by today’s standards. Now imagine these technologies being employed in 1923. The competition wouldn’t stand a chance.
Alfred Angus Scott was so ahead of his time, his machines were outlawed in numerous racing organizations. All told, the Scott name would be responsible for over 60 motorcycle patents.