fILTER box holes ?????

3 replies to this topic
  • Guest_Guest_*

Posted January 19, 2001 - 10:10 PM


Ok my question is this.......
My neighbor bought a brand new Raptor and the thing was so restricted on the air flow that he went to the dealer and they gave him some funky things about 3/4in in dia that were like miniture airfilters.
You drill a specified size hole in the side of your air box and the fit into it allowing more air through to the filter.
They are foam with a mesh screen on them.
Pretty cool!
Just wondering if anyone has tried these on a 400/426 yet?
If so what results did you get?
They are only about $5 for 6 .
I just wonder if the yz has enuf space between the seat and airbox that they are really unneeded or if they would actually help the airflow. There seems to be a massive amount of air traveling thru the box already and maybe more is needed.

ride BLUE

  • dirtdad

Posted January 20, 2001 - 04:30 AM


G4, Although this is considered a popular
cheap/easy power gain on most bikes, everything that I've read on the subject suggests it's not advisable on the Yamaha.

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  • Rich_Rohrich

Posted January 20, 2001 - 07:43 AM


The YZ/WR airbox is designed as a resonant chamber. Drilling holes in the side of it will effectively destroy the resonant effects and leave a hole in the torque curve. The same is likely true for the Raptor, but I haven't had the opportunity to take a close look at one yet.

  • motoman393

Posted January 20, 2001 - 06:26 PM


One of the people I ride with has done this mod (he stuck 2 on each side of the airbox) He claims he has more acceleration and mid range hit...but I doubt it helps the YZ already flows plenty of air already! He rides a 00' 426 if that helps!


I get my kicks on a 2001' YZ426!
Friendswood, TX

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