How does a fuel injected motorcycle run without an oxygen sensor / lambda probe ? (Yamaha R1 2002 )?

O2 sensors are emmision control devices. It does ist in fuel mixture calculations on cars , but not required as the fuel delivery system on the bike is similar but yet different. it has a predetermined set of fuel trims or tables that is programmed into the CDI box. It also uses the TP sensor, the IAT sensor, Coolant temp sensor, BARO and MAP sensors for real time fuel adjustments. You will find o2 sensors on anything that has a Cat converter where the emmissions must be maintained at certain levels while the Cat does its job reducing certain ges and converting them to co2 and oxygen.