Would a K&N filter require a rejetting of the carbs?

Discussion in 'Softail Models' started by GimmeFuel, Nov 2, 2010.

  1. GimmeFuel

    GimmeFuel Member

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    I've got a 2004 Fat Boy and am considering installing a K&N air filter. Would doing that require rejetting the carbs?

    Also, what do you folks think of Uni air filters?
     
    Last edited by a moderator: Nov 2, 2010
  2. fin_676

    fin_676 Experienced Member Staff Member Moderator Contributor

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  3. Breeze3at

    Breeze3at Well-Known Member

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    There are many variations of K&N filters. Some are direct replacement, and although better flowing, not considered "performance", so no rejetting should be required. Performance K&N filters usually require some modification to the air box, or have a different backing plate altogether. They DO require rejetting. I used a Uni foam over wire element in my Sportster for quite a while, it seemed to do the job.
     
  4. Jack Klarich

    Jack Klarich Expert Member

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    As Breeze said if just doing the filter you will be fine, K N in all my bikes always:s
     
  5. Honest Abe

    Honest Abe Member

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    I would have to agree with fin_676. K&N may advertise that their filters are direct replacements, but in the same breath they will also tell you that their filters increase the airflow about 10-30%. You can install it, and you will most likely notice that about 1/2 to 3/4 throttle you will start to choke the carb, and the bike will die... Too much air, which would require you to rejet. If not ...then you lucked out and are good to go....

    Discalimer::)This is just my humble opnion and it is only based on my personal and limited experience.
    my name is Honest abe and I approved this message:p
     
  6. wilks3

    wilks3 Junior Member

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    +1 for Capt Jack.
    wilks3