10. Spondon SRX-6
This is what I wanted my old SRX-6 to be once upon a time: Your basic overbored, Carrillo-rodded, twin smoothbore-carbureted Single, producing 71 horsepower and reportedly (in Performance Bikes) capable of 148 mph on a cold day in England. The handmade Spondon frame (with adjustable offset) was as cool as it got at the time, the TZ250 running gear probably still is, the tank’s aluminium, of course, and the whole thing’s supposed to weigh 275 pounds. A gruff little beast from a time when Sound of Singles was kind of a big deal.