No, not all motorcycles have oxygen sensors. The presence of an oxygen sensor on a motorcycle depends on various factors, including the make, model, and year of the motorcycle. Oxygen sensors are typically found in motorcycles with fuel injection systems, which are more common in modern motorcycles. These sensors monitor the level of oxygen in the exhaust gases and provide feedback to the engine control unit (ECU) to adjust the air-fuel mixture for optimal combustion.
Instead, they may rely on carburetors for fuel delivery, which do not typically incorporate oxygen sensors.
It's worth noting that the prevalence of oxygen sensors in motorcycles has increased over the years due to stricter emissions regulations and advancements in engine technology. Therefore, newer motorcycles are more likely to have oxygen sensors compared to older models.