Most of the fuel controllers, until recently, require disconnecting the O2 sensors. Hopefully someone who has more technical knowledge may be able to offer more info. It runs fine without it. My 08 Heritage had one of its O2 Sensors unplugged for the first 5-6K miles and I only found out when I replaced the exhaust and never has any issues to that point without that O2 Sensor plugged in. If you get one from a local pull-it yard, be sure to snip off and take the O2 connector as well. Look under the battery box or under the seat, that's where the steel frame bikes usually have a Power Commander mounted. the air/fuel mixture becomes incorrect to some degree. History of the sensor: An efficient internal combustion engine is the one whose air to fuel mixture is the ratio of 14.7 part air to 1 part fuel. As for whether you need to retain it, it depends on your engine management system: some will run OK without it, some must have the sensor, or it'll be rough as home-made scrumpy from tickover. The function of the (O2) oxygen sensor is to measure the difference; between the amount of oxygen in the exhaust gas and the amount of oxygen in the air. Bypassing an oxygen sensor--also called an O2 sensor--can only be done using a dummy O2 sensor. The short answer is: Yes, the BoosterPlug and the O2 (Lambda) sensor will prevent the motorcycle engine from running too lean - with or without the catalytic converter in the exhaust system. When choosing an O2 sensor, look for a 4-wire (heated) sensor. In time, due to wear of parts, residues of liquid and/or tar deposit on surfaces, sensors becoming less accurate, etc. This particular combination of air and fuel is known as Lambda, and that’s how the sensor gets its name, it is also known as the oxygen sensor. Wire the A/F gauge according to the following diagram. For example in my car if i unplug the O2 sensor then the ECU will throw errors/code and the engine will run poorly ,bad gas millage etc. Their input is confusing to the controller. Many racers using a leaded fuel in an oxygen sensor application are able to use the sensor only for tuning purposes and then remove it. This ensures a much longer usable life for the sensor. The engine may perform badly since the silencer has been taken in consideration when the engine has been designed and tuned at the factory. When a car is brand new everything is adjusted so the air/fuel mixture is optimal without using the O2 sensor. Oxygen sensors are part of the vehicle's emissions control system and it may or may not be legal to replace the O2 sensor with a dummy sensor. My 899 has the full akra system without the lambda sensor. The O2 harness consists of the A/F gauge, wiring and an O2 sensor. While I doubt you would do any harm I am not sure if you would notice any problems with how your bike runs without the O2 Sensors in place. The useful life of an oxygen sensor used with a leaded fuel is hard to predict, but one thing is certain: it will eventually fail. Consequently, with information from the (O2) oxygen sensor and other sources; the (ECU) can decide, whether the air/fuel ratio of your engine is, rich or lean. This sensor was first used in cars in 1977. The exhaust was fitted at a dealership by the previous owner. If by “exhaust” you mean “silencer” then the answer is no, no damage will be done. Then i understand that a Yamaha R1 from 2002 (and maybe some other years/models etc.. i asked about his one because i own it :) ) do not have an o2 sensor . As mentioned above, the O2 sensor will adjust the air/fuel ratio in closed loop mode (High RPM), so the decat will not damage your engine. I presume this is the norm when fitting the full system. This is all I know I'm afraid.
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