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Thread: Classic K? Change Your Breather Hose

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  1. #1
    Dum vivimus vivamus ted's Avatar
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    Classic K? Change Your Breather Hose

    A friend bought a K75C some time ago and I coached her on what parts to buy to bring it back to life. She sold the bike before we could do much of the work and I inherited the parts (including a breather hose and clamps...) So this afternoon I was going through my parts bin and decided that even though it was supposedly just changed 12k miles ago, it is such an easy job I might as well knock it out. I grabbed my tools, aka a long shank flat head screwdriver, and headed out to the bike.

    It looked great, maybe a little dry rotted around the neck but nothing to worry about, here is a pic of it removed, as it looked on the bike:



    I loosed up the hose clamps and popped off the old one, and was pretty surprised at this:



    Yup - that harmless and very minor dry rot was actually a tear going about 2/3 around the entire neck. I popped the new one on (making sure to orient it correctly and load the hose clamps first) and screwed it in. Planning on a ride tomorrow morning, hoping it will ride even nicer

    So, moral of the story, spend the $20 and replace yours next time you are working on the bike - takes all of three minutes!
    Ted
    "A good stick is a good reason"
    1994 K75RT
    Moto Pages

  2. #2
    Chairman of the hoard wmubrown's Avatar
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    This was part of my annual maintenance on the K1100LT... el crapo rubber means this pieces cracks/tears yearly.
    John A. Brown - Kalamazoo MI
    '09 K1300S 'Zoot' (Wicked, bad, naughty, evil, Zoot!)
    '94 K1100LT 'Desert' (the horse with no name)

  3. #3
    It's a way of life! oldnslow's Avatar
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    Ok dumb question...what is this hose for and where is it on my 85 K100RT?

  4. #4
    3 Red Bricks
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    NOT a dumb question. The only dumb ones are the ones that go unasked.

    The hose vents crankcase pressure into the back of the intake plenum just above the throttle bodies. Any crack in this hose allows unmetered air into the throttle bodies causing a lean condition.

    I am not positive how visible it is on an RT with the lowers installed. It is a black 1/2-3/4" diameter Z shaped hose (See Ted's picture).

    It is on the left side of the engine to the rear of the throttle bodies and ahead of the coils. It is in behind the black plastic Throttle Position Switch that is on the right end of the throttle shaft.

    I hate to make any negative comments about one of our best parts suppliers, but, unless he has changed suppliers or the supplier has upgraded his product, DO NOT buy the reproduction sold by Beemerboneyard. The quality of this particular reproduction is even worse (thinner and with very noticeable weakness at the mold lines). Their price is only $9 vs BMW's $15.20, but if it's going to fail more often, there is a net negative savings. I don't fault Beemerboneyard for trying to get a more cost conscious solution for our common problem, but in this one isolated instance their supplier came up short. I continue to look to Beemerboneyard for MANY huge savings on new (master cylinder rebuild kits, oil filters, etc) and used parts for our bikes. They are a first rate source for early K parts.



    LONG MAY YOUR BRICK FLY!

    Ride Safe, Ride Far, Ride Often

    Lee Fulton Forum Moderator
    3 Marakesh Red K75Ss
    Mine, Hers, Spare

  5. #5
    Mars needs women! 35634's Avatar
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    I changed mine last year just because it was 24 years old. It was stiff, but no cracking or splits. I'll keep it and see how the Beemboneyard replacement holds up. Since it's not a stressed or highly pressurized part, the thickness might not be an issue as much as the compound.
    1987 K75S
    Original litter
    Original owner
    2012 Ural Gear Up

  6. #6
    3 Red Bricks
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    Quote Originally Posted by 35634 View Post
    I changed mine last year just because it was 24 years old. It was stiff, but no cracking or splits. I'll keep it and see how the Beemboneyard replacement holds up. Since it's not a stressed or highly pressurized part, the thickness might not be an issue as much as the compound.
    If it's already in the bike, I would keep a much closer eye on it than in the past and when it fails (they ALL do, OEM or not) replace it with OEM.



    LONG MAY YOUR BRICK FLY!

    Ride Safe, Ride Far, Ride Often

    Lee Fulton Forum Moderator
    3 Marakesh Red K75Ss
    Mine, Hers, Spare

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