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Thread: fmf reed cages, any good?

  1. #1
    Join Date
    Apr 2010
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    Oregon Dunes
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    84

    fmf reed cages, any good?

    got a couple fmf reed cages for 250r's, i have read that they arn't that good. dose this have to do with them only having 4 openings?
    -also whats up with stuffers? i think if they are match ported to the intake boot there is no resistance to the stock flow and would direct the flow. i have also been told that the void area behind the boot in the reed cage is good for air/fuel mixture and evens out the air flow. What do you guys think?
    Attached Thumbnails Attached Thumbnails fmff.jpg  

  2. #2
    Join Date
    Apr 2010
    Location
    Oregon Dunes
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    84
    i am totally under the impression that boyesens in the stock cage are the best for a non ported stock head. but for 300+ v-force all day, fmf sux period. What do you guys think about stuffers? the little plastic thing that you can put in a reed cage. for our style cage the only stock ones were in cr250r's.
    A couple questions make me want to know about them: Why dosn't the intake boot dosnt taper all the way out to the edge of the cage flange, where the boot and reed cage meet. - like if the 'a' and 'b' intake gaskets were the same- Is there a reason to have this constriction then open cage for air/fuel mixing. I have heard the reason its not a direct open flow design is to keep the intake flow consistant and not regulated by the quick throttle blurps. may be thats why they put them in cr's, to get that quick throttle snap. imput?

  3. #3
    Join Date
    Oct 2003
    Location
    Las Vegas, NV.
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    2,489
    I used to run an FMF reed cage many years ago, and it worked as well as if not better than the boyesen reeds on stock cage that it replaced. It wasn't just the CR250R's that utilized reed cage stuffers, as '86 250R's came with them as well. The stuffer smooths out the airflow of the incoming air/fuel charge, and since smooth air flows better than turbulent air, it allows the engine to breathe more efficiently.
    Red Rider's Sand Machine Updated 07/23/14

  4. #4
    Join Date
    Apr 2010
    Location
    Oregon Dunes
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    84
    Quote Originally Posted by Red Rider View Post
    The stuffer smooths out the airflow of the incoming air/fuel charge, and since smooth air flows better than turbulent air, it allows the engine to breathe more efficiently.
    thats what i thought. after i get my bike tuned all up and need reeds the next time i will throw the fmf in. I got a stuffer for the stock reed cage and i might swap that in and out and see what happens.

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