![]() The other reason may be that as long as you’re running a factory setup, this system works just fine. ![]() Although unconfirmed out best guest for the reason for this is EPA regulations and requirements. Unfortunately as mentioned before even bikes with O 2 sensors installed run in an open loop mode the majority of the time and only switch to closed loop mode when you really get on the throttle. This allows your bike the ability to run in a closed loop mode meaning it can take the data from the O 2 sensors combined with the map and constantly make adjustments. ![]() In more recent years Harley-Davidson has started fitting their exhaust systems with O 2 sensors which take readings from your exhaust and determine if you’re running too rich, too lean or just right. 4.) Closed Loop, or Auto Tuning Fuel Managers – Out of the factory your bike will run in an open loop mode most of the time, meaning it will take all its information from the static map loaded on the ECU.
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