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Hello, new the the forum so I’m hoping someone can help.
i have a 2020 Yamaha r6 & recently installed a full two brothers exhaust with k&n filter & ECU flash.
after it was flashed I’ve noticed that almost every cold/ hot start I have to blip the throttle so it idles normally. If I don’t blip the throttle it sounds like it’s choppy & bogging down & just doesn’t idle correctly.
not sure what it could be but I know the r6 shouldn’t sound choppy, it should have a real smooth idle soundto it.
 

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I have a second-generation R6 and have noticed that what is rarely a smooth idle, becomes smooth when blocking the exhaust. It also impacts fuel/air ratio feedback from the oxygen sensor. Second gen bikes do not have the EXUP valve blocking the exhaust, or an oxygen sensor that is feeding realtime data to the ECU for on-the-fly tuning.

More information about EXUP...
There have been lllooonnngggg discussions to the point of insults on this...
 
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