2010 YZ450 Air Filter help

5 replies to this topic
  • bkoz

Posted May 31, 2012 - 05:22 PM


I bought my YZ with a K'n'N filter and no stock air filter.

I want to replace the K'n'N with a Twin Air.

My question is about the OEM filter. The parts fiche shows 3 pieces to the stock air filter.

Does the Twin Air replace all 3 pieces? Or should i order the 2 pieces under the main filter. Yamaha calls them the "Secondary Air Filter" and "Net".

  • bkoz

Posted June 01, 2012 - 05:21 AM



#27 and #28 are what I am wondering about. I believe that #27 (Net) is the back fire screen.

Does anybody know if #28 is needed with the Twin Air filter?

  • cereal killer

Posted June 01, 2012 - 06:24 AM


When I've purchased twin air filters before, it's just a piece of foam that comes in the bag. The cage it mounts to is not included.

That said, I never remove parts when installing them, so if #'s 27 and 28 are supposed to be present but aren't, I would put them back. Does your bike still have the mesh screen in place?

(Whereabouts in Alberta are you from? I'm in Calgary).

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  • bkoz

Posted June 01, 2012 - 06:51 PM


Yes the backfire screen is still there.

Maybe I made the question too complicated.

Do i need the Secondary filter #28 with the Twin Air filter?

Somebody has to be running a Twin Air filter!

And cereal killer, Edmonton.

  • rotax800

Posted June 02, 2012 - 01:14 PM


the twin air comes complete. put it in, put the cage on and cover and go.

  • BGoyins

Posted June 06, 2012 - 04:12 PM


I have the 2011 YZ450F. The thin filter between the screen and main filter is (as I understand it) just to keep dirt from falling down into the intake when you remove the main filter. I have the Twin Air and I still use the thin filter. I ordered a No Toil filter and it came with a new thin filter if you wish to change it. I can't believe it adds much restriction and is nice insurance from dropping crud into the intake.

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