1. Dismiss Notice
  2. Dismiss Notice
  3. Hey Facebook people... We've created a group for XS650.com members to connect. Check it out!
    Dismiss Notice

Crankcase breather

Discussion in 'The Garage' started by dlabkeeg, May 29, 2010.

  1. dlabkeeg

    dlabkeeg XS650 Addict

    For all you guy who got rid of the OEM air boxes, what did you do with your crankcase breather? Where did you put the hose/filters and the like? Pics if you got them, please.
     
  2. txpowdercoater

    txpowdercoater XS650 Addict

    206
    1
    16
    I used the one from mikes xs with the rubber bottom, it is used with about 2" of hose , basically tucks into the downward curve of the backbone and the rubber base keeps it snug and no rattles.
     
  3. dlabkeeg

    dlabkeeg XS650 Addict

    Do you have the single or duel breather powder? Do you mind if I just call you powder? I'll picture you as stark white bald guy. Don't know how old you are, so I hope you get the movie reference.
     
  4. txpowdercoater

    txpowdercoater XS650 Addict

    206
    1
    16
    single, nope, almost, 48, yup:)
    [​IMG]
     
  5. Inked Monkey

    Inked Monkey XS650 Addict

    240
    0
    16
    KCMO
    I just used a cheapo from the parts store. It clamps to the nipple and looks good.
     
  6. dlabkeeg

    dlabkeeg XS650 Addict

    Could I please get a pic you damn dirty ape. Umm.. I mean inked monkey. I'm all about movie references today.:D
     
  7. Wally

    Wally XS650 Addict

    As others have done
    I just went to the car wreckers & got a one way valve of a car brake booster & fitted it to the breather line
     

    Attached Files:

  8. Inked Monkey

    Inked Monkey XS650 Addict

    240
    0
    16
    KCMO
    Here's a pic of the one from the parts store. I think it was under $10 and comes in a bunch of different colors for all the import tuners. I got red, but I believe there is also blue, yellow and green. It has a soft tube that is part of the filter that clamps to the nipple, so no need for any other hose.
     

    Attached Files:

  9. why is a filter needed here? it's blowing air, not sucking it in, correct?
     
  10. inxs

    inxs xx

    2,265
    37
    38
    - as the pistons go through their cycle the internal engine volume changes-this vent helps compensate for this
    - if youve overfilled with oil youll get oil out here
    - normal engine operation mists oil in the crankcase so as air circulates here you get an oil build up
    - as the rings and cylinder wear you get more internal pressure due to blow-by
     
  11. Like my life, it alternately blows and sucks. Without this when the pistons go up and down it would create a major crankcase vacuum/pressure cycle that would result in the end of the space/time continuum as we know it. And wouldn't that be bad.
     
  12. Inked Monkey

    Inked Monkey XS650 Addict

    240
    0
    16
    KCMO
    Nice! Hey kent I work in smithville.
     
  13. so having a filter just catches oil? on a stock bike, there is a hose for the breather going into the airbox? with no filter?

    i do not have a filter on mine, it doesn't blow any oil. i have 2 breather valves so putting a filter i would need a t-fitting into one. if i don't have to, i won't
     
  14. Inked Monkey

    Inked Monkey XS650 Addict

    240
    0
    16
    KCMO
    I just put one on there to keep crap out of the motor. Bugs and stuff. Better safe than sorry
     
  15. Cool. Where at? I live at the south end of the Lake by Crow's Creek, off Five Corner's Road.
     
  16. Inked Monkey

    Inked Monkey XS650 Addict

    240
    0
    16
    KCMO
    I work at the hospital on the mental health unit.
     
  17. XSLeo

    XSLeo XS650 Guru Top Contributor

    On the early models the breather vent emptied out over the chain, helped keep it oiled.As the years went by they changed the breather system. The epa didn't like oil blowed all over. They ended up with the breather vented into the airboxes and sucked into the engine to be burnt.
    I have the single nipple with the brake valve, and the hose running down behind the engine.
    I have been thinking that using the later single nipple breather with a brake booster valve, a tee and some hose to run it into the metal ends of my K&N air filters simular to the stock setup.
    Or the older two nipple with two valves and run one hose to each air filter.
    Maybe even an adapter between the carbs and air cleaner with a fitting to hook the hose to, even more like the stock set up.
     
  18. Tech7

    Tech7 XS650 Junkie

    I never quite understood the one way valve, brake booster check valve. In my opinion, he crankcase needs to breathe in and out. When the pistons go up, crankcase volume increases, as they go down, crankcase volume decreases. Also, as crankcase temps increase, the gases need to be released and the inverse is true as the engine cools. I think the check valve would inhibit this 2 way breathing action. Obviously the will be some oil/mist leakage on an engine with excessive wear/blowby. But I think the valve, in either direction may cause problems with gaskets and or seals. Yamahas solution was to try and reburn these gases when introducingb them into the airbox. Just my opinion.
     
  19. xjwmx

    xjwmx XS650 Guru Top Contributor

    6,862
    2,143
    313
    U.S.A.
    Where do you get 1/2" ID hose that doesn't have a huge OD like water hose? Not in the parts stores around here. HW store has thin wall clear but...
     
  20. pyrocentric

    pyrocentric XS650 Addict

    221
    0
    16
    Yeah, I'm running brake check valves currently, but I'm having my doubts as well. I guess the idea is that the crankcase will always leak air back in, so you'll never achieve more than a mild vacuum. I'm not sure if I buy that.
     

Share This Page