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Thread: Can installing a K&N air filter result in the bike running too lean, reducing torque?

  1. #1
    Junior Member
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    Can installing a K&N air filter result in the bike running too lean, reducing torque?

    2009 XB9SX, all stock except for a K&N air filter. It seems like I've lost quite a bit of low end torque. Would too much air, not enough fuel, cause this?

  2. #2
    I would like to learn this, am about to change mine as well.

  3. #3
    Senior Member GregoXB's Avatar
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    Any change in intake/exhaust will cause changes in fueling, in theory. Usually the ECM will adapt to a degree, but may not be able to accomodate the change perfectly. The only way to know 100 is to put it on a dyno.
    Last edited by GregoXB; 04-11-2019 at 12:03 PM.

  4. #4
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    Or get a Buelltooth and an Android device and check to see what's going on.

  5. #5
    Senior Member GregoXB's Avatar
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    ^ this

  6. #6
    Senior Member Cooter's Avatar
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    I totally agree with these guys to get some diagnostic info on it...

    Because there is no way you can feel the difference of adding a K&N air filter with your 'butt-dyno' unless something is very wrong.

    You shouldn't have had to remove the airbox lower plate to do this mod, but if you did, make SURE you put the airhorn seal back correctly (sandwiched on the lower plate)

  7. #7
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    Quote Originally Posted by Cooter View Post
    I totally agree with these guys to get some diagnostic info on it...

    Because there is no way you can feel the difference of adding a K&N air filter with your 'butt-dyno' unless something is very wrong.
    Confirmed. I put in a stock filter and I cannot tell a difference of torque versus the K&N. I installed ECMdroid and my rear AFV is showing 85.6%, front is locked at 100%. Not sure where to go from here.

  8. #8
    Senior Member Cooter's Avatar
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    There is a ton of info on Buelltooth.com, where you got the dongle) that will help.

    Your 2009 probably does not have a front O2 anyway.

    The ECM is pulling out a ton of fuel (15%), that's where your lack of power is coming from. Could be leaking intake seals or many other things.



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