Breather hose for Final Drive

Discussion in 'Airheads' started by One Less Harley, Jul 30, 2012.

  1. Renner

    Renner combustophile

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    chrome... :hmmmmm

    that may make the rest of my bike look <S>bad</S> worse. :D

    Looking good One Less, thanks for running with this.

    quanto costa?
    #21
  2. One Less Harley

    One Less Harley OH.THAT'S GONNA HURT

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    no cost yet as I need to price the hose. Guess it depends on how greedy I am... lucked out as there was no charge for shipping on the two sets of orders, which will keep cost down. As I met the minimum free shipping cost for the adapters, and the banjo bolts shipping was included in purchase price which wasn't too bad at all. It did take longer than expected to tap the parts and I buggered up my 10mm trying to make it a bottom tap, which didn't work as planned:cry.

    Guys give me some feedback on hose length, I'm thinking 42 inches will make it up to the back bone of the frame and slide it next to the frame pump as AW suggested. That will allow about 6" extra.
    #22
  3. hardwaregrrl

    hardwaregrrl ignore list

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    I'd go 48", just in case I have mine routed up under the seat along the subframe, and it required the full 4'. Maybe it's cause all that crazy travel suspension I got out back!:D
    #23
  4. One Less Harley

    One Less Harley OH.THAT'S GONNA HURT

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    There are better ways to get a longer wheel base.....but if it works for you that's all that counts.

    I was going to route to the swing arm pivot then up by the battery box to the the frame back bone.
    #24
  5. lochridge

    lochridge Been here awhile

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    please forgive my ignorance, but what is the point of doing this.
    mind you i have only had an airhead for about 2 weeks and i still have a long, long way to go.
    i just want to learn all i can.
    if you don't feel like explaining and can point me to a different thread, i would appreciate that as well.

    thank you
    #25
  6. One Less Harley

    One Less Harley OH.THAT'S GONNA HURT

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    IF one does creek crossings where the water is up to the final drive breather water will seep in and turn the oil into a chocolate milk shake. The longer breather hose it to prevent that. If not then don't worry about the mod. Mainly for the few nut cases that think the G/S us a U-boat.
    #26
  7. lochridge

    lochridge Been here awhile

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    ah ha. probably not for me then,
    thank you
    #27
  8. One Less Harley

    One Less Harley OH.THAT'S GONNA HURT

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    OK, everything's here and they are ready to go out. Only 3 left. (08/17/2012) Comes with FD adapter, banjo fitting and bolt, three crush washers, three cable ties, and 42" of black nylon hose. Price is $42.00 which includes shipping to the USA. PayPal only if paying as a gift, this is to avoid the pay pal fees.


    [​IMG]


    Suggested routing--be careful and don't kink the nylon hose, it's not as flexible as rubber, but should last longer.

    From FD under shock mount on right side-

    [​IMG]

    Then up through the hole near the frame tubing and use a strip tie on the hose just on top of where the hose exits the hole. Don't put a strip tie at the first hole (marked off in red), if one is used here, the suspension movement will pull on the hose. With the strip tie near the frame, this is more at the pivot point and pulls on the hose less.

    [​IMG]

    [​IMG]

    Then up by battery into the back bone of the frame next to the frame pump.

    [​IMG]
    #28
  9. Prutser

    Prutser Long timer

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    On my R80ST I'm using a hose like that for some months now.
    When I take the hose of it's full of condensation.
    I'm a bit afraid this wil drain back into my gearbox and final drive.(made one on the gearbox as well.)

    I know my bike gets warm enough. Normally it should be able to loose the moisture through the short original breather.

    Just a bit afraid it might not solve the problem. (or cause the same problem in a different way)
    I know it helps in river crossing. Tried that.........:scratch

    [​IMG]
    #29
  10. Airhead Wrangler

    Airhead Wrangler Long timer

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    I don't even think it takes a river crossing. Heavy splashing and long rides in heavy rains have been enough to do it for me. I've only had my final drive under few enough times to count on one hand, but I've found milky final drive oil quite a few times when no deep water was encountered.
    #30
  11. One Less Harley

    One Less Harley OH.THAT'S GONNA HURT

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    IF condensation is a worry one could add a "T" fitting with another hose at a low point to drain every now and then. I don't think water can travel up hill from the low point of the shock mount.
    #31
  12. Prutser

    Prutser Long timer

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    Did someone found the milky oil in the gearbox as well ????
    #32
  13. supershaft

    supershaft because I can

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    I agree with AW about it not taking a river crossing.

    It's the tranny that I always find full of water. People talk about this oil or that oil making your tranny last longer. I think the thing that is going to make them last longer is keeping water out of the oil. A remote vent would have to help during water crossings and whatnot but I know from experience that 95% of the water that gets in there on a street bike is getting in there via the speedo cable. Shrinking electrical wire shrink insulation over the cable and boot 100% solves the problem. Same thing with carb and choke junction boxes that are constantly getting filled with grit without the same trick. It keeps them absolutely perfectly clean for a LONG time. Till you need new cables in my experience.
    #33
  14. Prutser

    Prutser Long timer

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    Sealing the speedo cable works really good. Have been doing that for many years.:thumbup
    #34
  15. One Less Harley

    One Less Harley OH.THAT'S GONNA HURT

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    I've always gunked the speedo cable boot with lots of grease.
    #35
  16. Airhead Wrangler

    Airhead Wrangler Long timer

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    I replaced mine with this.

    [​IMG]
    #36
  17. One Less Harley

    One Less Harley OH.THAT'S GONNA HURT

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    Tomorrow I'm moving this to venders so if you requested one, speak up. Tomorrow I'll remove the names of ones that said they were interested and haven't responded.. Guys who've already replied to my email and paid no worries yours will be shipped on Friday. Reason for for the rush is I would like to make one trip to the post office and ship these out. My paypal is (rsh17@msn.com).
    #37
  18. supershaft

    supershaft because I can

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    I have seen goop in the boot and other methods not work so well. I am just trying to help but the shrunk shrink tubing really works well. I discovered that trick shortly after getting my brand new LS and seeing how quickly the cable junction boxes filled with grit. It worked perfectly so then I tried the trick out on the speedo cable with the same results. I also do the same trick on Dellorto throttle cables at the carb. Without the trick those cable adjusters are like water funnels! AW's solution looks good too but I need my speedo! I hate to say it but I would rather have a speedo over a tach for a street bike.
    #38
  19. One Less Harley

    One Less Harley OH.THAT'S GONNA HURT

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    OK. guys shrink tubing is going on tomorrow!! It'll give me a chance to refresh the grease.
    #39
  20. Airhead Wrangler

    Airhead Wrangler Long timer

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    Classy looking piece of kit, by the way. Also, FYI, it looks like the locknut for your ride height adjustment backed itself off.
    #40