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My 2011 CBR250R has a cat, fuel injection, and an O2 sensor. Also has air injection for deceleration. It would be interesting to test that bike with their aero improvements. The three way cats have required O2 sensors on cars since the early 1990s as a general rule.
When they got the feedback systems working, then they increased the compression and let the cat and sensor clean up the exhaust. The trend went back to performance compared to the early cat cars that were low compression gutless dogs. Injector shut off on deceleration came at about the same time, which allowed elimination of the air injection pump.
regards
Mech
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