Air Filter

Is it a bad idea to cut out the screen in the stock air filter cage?

yes

if you dont want a screen and want to run the risk of a backfire igniting your filter, then get the cage from a yz125.

yes

if you dont want a screen and want to run the risk of a backfire igniting your filter, then get the cage from a yz125.

can the backfire not go through the screen???

Yes leave the cage in you wont notice a power gain from taking it out.

I only have 3 hours on my '09 250F so I haven't cleaned the filter yet. I did get a new Twin Air filter today to oil and replace the stock unit, so then I'll get to see what exactly you guys are referring to. Is the stock filter decent, or should I just toss it?

Its good. I use it until its worn out. Or you can set it aside and put it back on when you sell it so it still looks new. I have been using the PC racing filters for the last year and love them. They are a two filter system. One looks like a regular filter and then the other one is a foam cover that goes over it and wont fall off. After a day of riding I remove the foam one and run for another day with the first one. If you are riding the desert a lot you can take the outer one off half way through the day. I use No Toil air filter oil for the filter.

can the backfire not go through the screen???

The screen is there to prevent a backfire reaching the filter element.

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