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Thread: Air Box mods

  1. #1

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    Air Box mods

    does anyone work on their air boxes ? if so.. what can be done and what are the results of the mods ?


  2. #2
    JET250's Avatar
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    I doubt you will get much if any benefit as the stock air box flows well. If you are riding in the surf leave it alone its much safer. The riva intake helps acceleration it does have bigger diameter feed though.

  3. #3
    RonJon's Avatar
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    I took out the thick metal flame arrester on my 08 15F and just left the larger mesh one in there.

    You can do this in 10 minutes. It gave me 1-2 extra bars of rpm and you maintain the safety of the stock airbox...

    JET250 is right... riding in surf is risky with an after market filter because of water possibly getting in the motor.

    I had the RIVA-type filter and got rid of it for the water reason. Now I get identical preformance with the airbox mod I did.

    Goodluck!

  4. #4
    Ultra250XRider's Avatar
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    Quote Originally Posted by RonJon View Post
    I took out the thick metal flame arrester on my 08 15F and just left the larger mesh one in there.

    You can do this in 10 minutes. It gave me 1-2 extra bars of rpm and you maintain the safety of the stock airbox...
    Tell me more about the thick metal flame arrestor. I never heard about anyone else doing that.

  5. #5
    RonJon's Avatar
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    I'm not sure if the 250/260 are the same as the 15F, but when you open up the air box there are two 'screens' inside. One is about 7 inches long by 3 inches wide and it like a metal version of standerd pool cage screen. Leave this one where it is. It does not block air flow that much, plus it keeps out debris.

    The second is smaller and is about the size of a jelly donut and made of thick metal with tiny holes drilled in it. Get rid of it. There is 'c-clip' mounted to this piece that holds a rubber hose inside the air box that leads to the oil catch can. I cut about 2 1/2 inches off because it hangs directly in front of the throttle body inside the air box.

    Now put it all back together with only the 7 x 3 inch 'screen-type' arrester in the box and let her rip

  6. #6
    Take the time to smile sirbreaksalot's Avatar
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    They are nothing alike
    and there is nothing at all inside the ULTRA box

    see pic below

    Waz
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  7. #7

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    Removal of that screen probably defeats the flame-arrester function in the 15f.....not sure it`s necessary anyway.

  8. #8
    RonJon's Avatar
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    There is still a second, larger, far-less restrictive screen left in place for flame arresting duties. I tested the box before and after. It flows SIGNIFICANTLY more air with the smaller, thick one removed.

  9. #9

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    Very interesting.....were you able to verify a speed increase, or just the tach?

    Gotta love a simple, cheap, better-breathing modification!

  10. #10
    RonJon's Avatar
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    Quote Originally Posted by Shuswap View Post
    Very interesting.....were you able to verify a speed increase, or just the tach?
    The best speed I got on GPS before the mod was 61.5. On the same day, immediatly after I did the mod I hit 63.5 TWICE. All on GPS.

    However, mind you, all these speed runs were on glass, with the fuel buzzer going off, riding superman. NO other mods/tweeks were done.

    So I think it's safe to expect a solid 1.5 mph increase, but the acceleration was very noticable too.

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