![]() In motorcycles (and cars), the “measuring element” is usually an oxygen sensor.īelow I’ll explain this in more detail, including when a motorcycle is in closed loop vs open loop, and how it affects the way you ride. The point of closed-loop is to get as close as possible to an efficient air/fuel mixture. The most important thing to understand about closed-loop combustion is that it’s a compromise for fuel efficiency and environmental purposes. If you were building an all-out gas guzzling race machine, you wouldn’t need closed loop at all. But you’d use a lot more petrol and you’d never pass ever-tightening emissions standards. Motorcycles switch to closed-loop mode when they’re basically idling. They’re idling (after they’ve warmed up).You’re at low-mid throttle (say under 40%) and constant speed. ![]() ![]() ![]() When you operate the motorcycle at a constant speed (constant load, constant throttle), the ECU switches to closed-loop mode. ![]()
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