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2KR with an EXUP valve??? And what 3LN1/2KR parts interchange?

Discussion in 'Yamaha 250cc In-Line 4's' started by millenium7, Sep 16, 2015.

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  1. Joker

    Joker See "about me" for contact details. Contributing Member

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    I wiggle the airbox on, heat the boots in boiling water if I need a bit of flexibility. Airbox is a real pain in the ass.
     
    Joker, Sep 28, 2015
    #21
  2. richie

    richie Active Member

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    I heated mine with a hair dryer slipped on lovely once they cool down then there practically welded on!
     
    richie, Sep 28, 2015
    #22
  3. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    Silicone won't dissolve but it suffers from expansion as great as 120% when exposed to fuel.

    Of all the elastomers tested, silicone rubber underwent the highest level of volume expansion (>120%) when exposed to the test fuels. This swell was accompanied by a 20 point drop in hardness. However, following dry-out, the silicone sample returned to its original condition with only a slight level of shrinkage and mass loss. The excessive volume swell means that silicone is susceptible to fluid permeation and extrusion (between sealed surfaces), depending on the sealing application. As with the fluoroelastomers, silicone did not suffer any structural degradation from exposure to the test fluids. Source: http://info.ornl.gov/sites/publications/files/Pub27766.pdf

    As you mentioned it should not be getting wet on the air cleaner side. My post was meant to be more of a warning to others.
    cheers
    Blair
     
    • Like Like x 1
    maelstrom, Sep 28, 2015
    #23
  4. millenium7

    millenium7 Member

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    Be interesting to see some measurements (when cold) as I cannot imagine getting those boots on. I tried boiling water and it did bugger all. The thing is I cannot properly seat even '1' boot by itself with no airbox involved. Thats reaching in and also stretching the inside of the boots using all my strength, and i'm not a weak guy. I can just barely get them on, crooked. And they just pop off as soon as I bump them. If I use grease its actually worse as they'll slip off on their own in a couple seconds.
    I'm convinced somethings been changed at some point because of this. Cause if I can't them on by themselves when I have full XYZ degrees of movement and a hell of a lot of force. There is absolutely no way they are going on when in the airbox and I can only wiggle them back n forth
     
    millenium7, Sep 28, 2015
    #24
  5. Linkin

    Linkin The Mechanic Premium Member Contributing Member Dirty Wheel Club

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    You could try soaking them in oil of wintergreen and isopropyl alcohol in a sealed container (shake well), but for the price of enough isopropyl and oil of wintergreen you can just buy 4 new airbox boots from a Yamaha dealer.
     
    Linkin, Sep 28, 2015
    #25
  6. Murdo

    Murdo The Good Doctor Staff Member Contributing Member Ride and Events Crew

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    Sounds like they are the wrong size boots, and your trying to force them onto too big a carb.
     
    Murdo, Sep 28, 2015
    #26
  7. Linkin

    Linkin The Mechanic Premium Member Contributing Member Dirty Wheel Club

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    The airbox boots shrink when old and become very stiff - Like new you can squish them in your hand
     
    Linkin, Sep 28, 2015
    #27
  8. millenium7

    millenium7 Member

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    They don't feel old and brittle. The top section that lives in the airbox I can squish a decent amount. The middle and lower sections are soft on the outside and you can feel some give in them and I can bent the lip around no problem, very pliable. But the boots are also incredibly rigid, like there's a metal sleeve in them. Cannot deform them very much at all

    Where's a place to buy new boots? and how much are they? I've seen them somewhere for about $300 which is definitely not something i'm willing to pay when silicone hose and 8 clamps do the job for about $50
     
    millenium7, Sep 28, 2015
    #28
  9. Linkin

    Linkin The Mechanic Premium Member Contributing Member Dirty Wheel Club

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    The boots the carbs sit on are the expensive ones. The boots that attach the airbox to the carbs can be had for $10-$15 a piece. You just need the part number from the parts book.
     
    Linkin, Sep 28, 2015
    #29
  10. millenium7

    millenium7 Member

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    The resource section has the 3LN parts schematic but not the 2KR. P/N is 3LN-14453-00 and since it starts with 3LN i'm going to assume they aren't the same
     
    millenium7, Sep 28, 2015
    #30
  11. Linkin

    Linkin The Mechanic Premium Member Contributing Member Dirty Wheel Club

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    Try 2KR, 1HX, 2GH prefixes
     
    Linkin, Sep 28, 2015
    #31
  12. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    The 3HX1 parts book shows the part number as 1HX-14453-00.
    The silicone hose option sounds like a good idea if you cannot get the original parts.
    [​IMG]
     
    maelstrom, Sep 28, 2015
    #32
  13. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    Zeal has the same part # so should be readily available from a Yamaha dealer

    Zeal

    Zeal.jpg

    2KR

    2kr boots.jpg
     
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    Last edited: Sep 28, 2015
    GreyImport, Sep 28, 2015
    #33
  14. millenium7

    millenium7 Member

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    Thought it important that I post an update to the above. I was using short bits of radiator hose and clamps to get by, but I did eventually order 4 new boots (P/N: 1HX-14453-00 or 1HX-14453-00-00) got them from www.boats.net total came to $37.62AUD after postage and currency conversion - gotta be happy with that!
    Anyway when they arrived I thought "holy crap thats different...." so I thought the ones I had were supple as they did have some give in the lower section, but were pretty firm in the top. No visible cracking or aging though. Well new ones are very soft, so soft you can compress them in the middle with your fingers so each side touches. And MUCH larger in diameter, I can't believe the old ones had shrunk so damn much.... the new ones slide onto the carbs with very modest resistance. Sure enough fit all 4 into the airbox (old set would just rotate freely in the airbox holes, new ones barely move) and then fit the airbox to the carbs. Only requires slight pressure and a little wiggle to pop on. No fighting needed.

    So for anyone in future having issues mounting the airbox, get those new boots. They clearly shrink an insane amount over time even if they physically look and feel fine
     
    • Like Like x 3
    millenium7, Dec 23, 2015
    #34
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