YZF-R6
The YZF-R6's 16,000 RPM inline-four with titanium valves achieves the highest specific output in the 600 supersport class — but was discontinued for US street sale after 2020, with only the track-only R6 Race remaining. Used clean-title examples at $7,000–$10,000 are sought after by riders who want a genuine supersport that can still be ridden on the street.
