>>28620834
Reiko is the rich one who can afford that, and even then she goes for the Carbed version because the author hates fuel injection and new features (which is based).
Koguma's supercub is a hand-me-down that had three separate owners who all treated it like shit. It's a plot point that she's the first person who has ever ridden it softly instead of full-out all of the time.
