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Old October 5th, 2018, 12:05 AM   #1
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take out airbox?

I have a 2009 ninja 250r with the engine off and I plan on selling it as soon as I get another engine in there. I was thinking of removing the stock airbox and just putting an aftermarket now that it's off before putting another engine in there since this is a convenient time to do so. Is that a good idea? What should I know before putting in an aftermarket airbox? If I were to put one in, what do you guys recommend?
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Old October 5th, 2018, 06:03 AM   #2
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Changing the intake system will open a can of worms that's best left closed.
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Old October 5th, 2018, 06:31 AM   #3
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You will find aftermarket "pod filters" to replace the stock airbox and filter, but not an aftermarket airbox.

In general it's going to cause you more work and some time tuning to get it to run right with pod filters - and it's not an improvement in all areas.
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Old October 5th, 2018, 07:07 AM   #4
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For a street bike, dont bother. You will lose some torque in the lower half of rev range. Unless you switch to a full exhaust you wont gain much on the top end.
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Old October 5th, 2018, 12:30 PM   #5
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Also expect a lot of stumbling, especially in cross-winds.
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Old October 6th, 2018, 12:10 PM   #6
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I just finished (in the summertime of this year) a pretty big effort to re-install the OEM airbox on my '05 EX250 Fuel Injection project bike.

Way back in 2009-2010 when I first modified the bike with fuel injection I took the easy way with regard to "packaging" all the necessary components (both the remaining original items + all the new FI components). There's just not a lot of room inside the EX250's frame and getting rid of the OEM airbox was an easy/quick way to get a lot of room to position things that weren't there before, like the FI fuel pump.

During the "pod filter years" (Fuel Injected + pod filters) I felt like the bike performed about as well as it had before modifications with one exception, the pod filter solution just didn't feel as good as the OEM airbox in the 8,000 to 12,000 RPM range where (I believe) the volume of the OEM airbox was specifically design-targeted by the Kawasaki engine guys to achieve a resonant frequency.

If you're one of those EX250 riders who regularly take the engine up to the 12,500-ish range you'll know what I'm talking about.

I came to believe that the pod filters might have better performance through the legendary EX250 "flat spot" in the 5,000 to 7,000 RPM range. My guess is that's the weakest part in the OEM airbox performance. You can never "have it all" so the Kawasaki engineers probably had to accept this situation if they were going to give the OEM airbox its 8,000 to 12,000 sweet spot.
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Old October 6th, 2018, 03:31 PM   #7
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if u do switch i have k/n pod with stock intake boot(airbox side) or uni individual pods. i sell em to ya at a great reduced price. be ready to do some tuning
"trying not to get old"
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Old October 11th, 2018, 06:56 AM   #8
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Hey check out my video i put in pods filters and split the airbox in half to take it out. you can find a jet kit pretty cheap if you know what specific main and pilot jet you need not the kit which is more expensive if you want to add an intake and exhaust i did with mine youll have to tune them i think you would really benefit from my video
check out the youtube ninja 250 motovlogs
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Old October 15th, 2018, 04:50 AM   #9
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I am working to put my airbox back in after years of not having it. I am interested to see if it clears up some of the tuning issues I have had with the pods.
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