Drilled Air Filter Cover for High Elevation Riding
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Thread: Drilled Air Filter Cover for High Elevation Riding

  1. #1
    Senior Member DonBenito's Avatar
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    Drilled Air Filter Cover for High Elevation Riding

    So I'm going to be spending a few days riding up around 9000' elevation, and I'm wanting to optimize the performance of my stock jetted 2011 carb. I'm riding up there and back from 2,400' Tucson, so re-jetting is out.

    I'm interested in drilling the holes in the air filter cover as I've read about, but I was wondering if there were any tips as to size, number, and location of holes that folks who've done this mod might have to offer.

    I asked about riding above 9000' a while back and Qwerty suggested drilling "a few 1.25cm holes". I was only spending about an hour at that elevation then, so I didn't drill, but since I'll be "riding high" for a few days this go round I'm ready to commit.

    I was also wondering about alternatives for plugging the holes, it seems tape is pretty popular but I'd love to try something a little more polished if anyone has any suggestions.
    2011 TW200 - Sold - after 9700 miles and 1,000,000 smiles. So long Tee Dub!
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  2. #2
    Senior Member PalmStateCrawler's Avatar
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    Uni airbox filter vents. When you dont need them you can tape over them from the underside and no one could tell the difference.
    DonBenito likes this.
    '13 690 Enduro R too many frickin farkles...
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  3. #3
    Senior Member admiral's Avatar
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    Here are the holes I drilled into my air-box cover. Right off I don't know what size drill bit I used, but you'll get a good idea. When I cover the holes up a lower elevation, I just use black duck tape. I used some rubber grommet plugs for a while, just found using tape wasn't as noticeable as I first though.

    If I had to drill the holes again, I'd drill them all above the plastic cover exposed area to avoid any water splashing in the lower exposed holes. Think I would drill slightly smaller holes as well.

    I found the holes help a lot with power and making starting easier at elevation, but I still have to turn the idle adjust knob slightly.


    Last edited by admiral; 07-15-2013 at 05:06 AM.
    DonBenito likes this.
    Hidden Content A ride in the woods helps me relax and release tension. The fact I'm dragging a body should be entirely irrelevant?

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