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Old November 20th, 2022, 01:31 PM   #1
Norway member
Name: S n 0 r r
Location: Stjoerdal, Norway (San Diego, CA, USA, 2015-2016 , Bielefeld, Nordrhein Westfalen,Germany 2021-'22)
Join Date: Sep 2012

Motorcycle(s): TMZ 5.952 "Tula" 200, Ninja 250 -Special ed. '11, ZZR 1400 (ZX14), Honda CB 1100 F Super Bol D'or

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Should one avoid cheap air filters from for example aliexpress and similar sites?

Since I live at about 6328′30″N 1110′15″E I don't ride the Ninja 250 all year round. When I have taken it out for a new season I noticed that it often struggled to get the rev counter beyond 10 000 RPMs, accelerated slower and appeared weak.
Some tanks of fresh 98 octane gasoline and/or a new air filter have regained some horsepower, from time to time.
Air filters quickly get clogged around here (Trondheim surroundings, Norway) due to lots of rain that mixes with dust due to road works et cetera.
Then my question is: Is it highly recommended to buy the more expensive air filters, or could one so about as well with some from chinese online shops offering air filters for a small fraction of the price of the original parts or other more costly variants? Anyone that knows, or has solid background for own opinions?
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Old November 20th, 2022, 10:17 PM   #2
floggolf newbie
Name: Jason
Location: Pacific NorthWET
Join Date: Oct 2022

Motorcycle(s): EX250F

Posts: 5
China foam

Do you wash and re-oil your filters?

I think the manual sez you can do this 5 times.

If the china foam doesnt get gooey or turn to crumbs, I don't think there would be a problem, as long as the pores in the foam are the same size.

The FAQ at sez the foam filters perform as well as the oiled cotton and other types.

I just bought a china foam filter, but won't put any run time on it until spring and I live near a rain forest. The air is pretty clean.
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Old November 21st, 2022, 09:14 AM   #3
thedrewski86 guru
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Name: Drew
Location: SoCal
Join Date: Jul 2013

Motorcycle(s): 2007 SV650S 2005 EX250F

Posts: 393
I run a foam Kawasaki filter that I got on ebay for $10. I also have a cheap foam no-name filter that was about the same price - I had to trim it to fit but it worked fine too. It's a spare because I would rather run something that came out of a "Kawasaki" box, all other things being equal
I have always been a fan of running factory-spec air filters. If it's still in good shape and needs oil, error on the side of oiling it lightly. Too much happens fast.
Don't think, look!
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Old November 22nd, 2022, 04:26 AM   #4
Shafer member
Name: Jay
Location: Nh
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Motorcycle(s): 07 Ninja ex250 blue and 07 Ninja black

Posts: 43
I would suggest getting a Uni Filter NU-2366 for the pregen and oiling it with Belray foam filter oil. (A little goes a long way, don't put it in soaking wet)

The air filter is your only defense from sucking stuff into your carbs and engine. Plus the filter takes a bit of effort to get to, just get a filter you don't need to worry about.

You can get the filter off Amazon for $20. Amazon's filter picture is generic for the Uni Filter NU-2366.
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