Making your own Foam Air Filter

Discussion in 'Australia' started by rigs_au, Apr 6, 2010.

  1. rigs_au

    rigs_au Corripe Cervisiam

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    A friend of mine has a Yama XT250 2009 model and there is no after market air filters for them. The stock is a paper piece of crap and costs $25.

    Has anyone made their own foam air filter, if so how, and what foam did you use?
    Once made it would be oiled as per all foam filters.
    #1
  2. ECKS-Man

    ECKS-Man Been here awhile

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    I would be looking for a similar one to the stocker, in foam of course, and try to get either a straight swap or a swap after minor adjustments. No idea what the specific foam is but it is usually several different densities.

    Just had a google looking to see what the thing looks like & couldn't find it after about 5 minutes so gave up.

    Sorry, not a lot of help to you!
    #2
  3. sieg

    sieg Wearing out tires......2 at a time, day after day.

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    I've made them but allways from another fillter as posted above, wouldn't make it from just any foam.
    #3
  4. rigs_au

    rigs_au Corripe Cervisiam

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    I have seen that you can buy Air Filter foam made by UNI. There is a web site for american cars that sells it.
    http://www.americanautos.com.au/

    Will investigate further.
    #4
  5. rpo83

    rpo83 Old enough to know better

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    I had to make one for my Bimota.

    I was able to buy a sheet of filter foam, try your local bike shop. The sheet i bought was about 30cm x 30cm x 12mm. From memory it was either uni filter or finer filter foam, as it was filter foam, it needs to be oiled.

    The Bimota simply had a flat piece of foam over a stainless mesh gauze. You can make custom shapes up but you will need to source a suitable glue.

    Good luck.
    #5
  6. charliew

    charliew Been here awhile

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    You can buy sheets of UniFilter foam if you pester your local dealer enough. I have done this to make an air filter for an old TL250 using the original cage.

    It might also pay to browse some of the microfiche to see if any other models use the same airfilter. My XR250 has an UniFilter listed for an XR500.
    #6
  7. Clancy

    Clancy Long timer

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    I made my own for the Transalp, and did what everyone else suggests, and bought a sheet of filter foam. Made up two filters and kept one in a ziplock bag, ready oiled so that it was just a case of changing it in camp if the roads had been really dusty.
    #7
  8. Andrew2

    Andrew2 Team 250

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    The wife has just got an '08 xt250 and you can't even buy different sized sprockets for them:baldy.As suggested,make your own.I will be.

    Cheers
    A2
    #8
  9. rigs_au

    rigs_au Corripe Cervisiam

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    After speaking to the guys at Z Power in Wgong, UNI do make an Air filter for the 08 and 09 XT250.
    We asked the local yamaha dealer to source an after market filter and they told us there was not any ...

    So dont always believe what the dealer tells you !!!!
    #9
  10. BruceC

    BruceC Been here awhile

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    Unifilter in Hornsby will make a filter to suit your bike. Cost is very reasonable - the custom filter I had made for a Transalp cost considerably less than the price of the genuine article. Just send them the old filter. They will make a replacement.

    Why stuff around trying to make one yourself, and risk stuffing it up (engines are expensive) when there is this type of service available.

    BruceC
    #10
  11. ditchwitch650

    ditchwitch650 Long timer

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    can you post up a pic please?

    i have made filters myself before i got the foam from clacke rubber and used a hot glue gun,

    sprockets should be the same as ttr 230 xt225 serrow ag200 etc!
    #11
  12. rosscoact

    rosscoact need constant supervision

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    there you go pete, fixed
    #12
  13. Bigem

    Bigem Long timer

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    I dont even bother with dealers anymore. If its not a helmet or jacket they are selling, the majority dont have a fucking clue about bike parts!!

    If you have a part number, punch it into here www.cmsnl.com/ and see what comes up.

    Or just use your model and year and get the part number and see if they can supply it.
    I have sourced quite a few Yamaha bits, and Suzuki too, that the dealers around here say are not available!!
    No wonder they are in friggin trouble.
    If their staff spent the same time learning their jobs instead of applying hair gel and getting face piercings, they might just stay in business a bit longer!!:rofl:rofl
    #13
  14. boxerboy81

    boxerboy81 Stay Horizontal

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    I had an aftermarket filter for my 83 R100RS 25 years ago. The deal then was they'd make you one if you sent them the old oem filter.

    They just gutted the pleated paper out from the filter, and inserted some metal mesh into the filter frame, with what looked like a silcone type sealant around the edges to seal/attach it. The mesh wasn't dissimilar to security door mesh.

    The two foam layers sat on top..a snug fit to all edges.

    They had 2 layers of foam from memory. The lower inner layer was a thin dry foam, but the thicker outer layer needed to be oiled.
    #14
  15. outback jack

    outback jack Long timer

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    You could probably modify the air box or snorkel to take an aftermarket filter like a K&N, the only problem might be getting the jetting right after the mod, not sure you can even by different jets for that bike. The plus side if you could would be a rather large power increase up from 16hp to maybe 19 :wink:
    #15
  16. RunningBare

    RunningBare Been here awhile

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    Uni filter are now located at Manns Rd West Gosford, give them a cll, I'm sure they can help you.
    #16
  17. leafman60

    leafman60 Long timer

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    Anybody have a suggestion about glue/sealers for filter foam? Urethane caulk? RTV silicone?
    #17
  18. Oz Nutter

    Oz Nutter Long timer

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    I like these sought of threads, always learning...good survival knowledge..
    #18
  19. JohnCW

    JohnCW Long timer

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    You can buy front sprockets from 14T to 16T, and rear sprockets from 43T to 50T of the internet for an XT250. Don't bother wasting your time going to a Yamaha dealer.
    #19
  20. JohnCW

    JohnCW Long timer

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    If you friend wants to save $25 on a filter that's fine, but the OEM filter is well made, does the job, and is no different in construction to the paper filters used by just about every car manufacturer in the world for the past 40 years.

    Foam breaks down over time and this is accelerated by the solvent used to clean the foam filter so they also need to be replaced. If your friend thinks foam will filter better than paper perhaps he should read the following articles.

    http://www.bobistheoilguy.com/airfilter/airtest1.htm

    http://www.duramax.bizhosting.com/My_Truck/foam.htm

    If he wants it to breath better at high revs, simply remove the air filter lid, secure the filter by other means, and fit a one size bigger main jet.
    #20