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Crank Case Breather???

This is a discussion on Crank Case Breather??? within the General Mean Streak forums, part of the Kawasaki Mean Streak category; A buddy of mine installed a Crank Case Breather on his Meanie.. (See attached picture).. Just curious what is the purpose of relocating the Crankcase ...

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  1. #1
    Site Elder regnaston's Avatar
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    Crank Case Breather???

    A buddy of mine installed a Crank Case Breather on his Meanie.. (See attached picture).. Just curious what is the purpose of relocating the Crankcase vent??

    2002 Kawasaki Mean Streak vn1500
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    Site Elder DreamStreak's Avatar
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    I'm guessing he thought it looked good, but it is not as functional as the stock set up because the stock set up uses vacuum from the intake to help evacuate the crankcase where what he has is just a vent, but serves it's purpose in keeping pressure from building in the crankcase and blowing seals, etc.
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  4. #3
    Site Elder rbthntr64's Avatar
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    When you remove the reed valves, the crankcase breather is part of that system. It has to go somewhere. I have mine up by the "choke" Throttle up knob.
    Attached Images Attached Images

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    Site Elder DreamStreak's Avatar
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    Quote Originally Posted by rbthntr64 View Post
    When you remove the reed valves, the crankcase breather is part of that system. It has to go somewhere. I have mine up by the "choke" Throttle up knob.
    No it isn't. There is no crankcase "breather". It is a crankcase evacuation hose that goes from the crankcase to the air intake. I have my reed valves removed and still use the original crankcase evacuation hose.
    2006 Mean Streak
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  6. #5
    Supreme Being streak07's Avatar
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    Yup. And normally you try to mount it higher to reduce the risk of losing oil out of it. Typically at or above the heads to reduce blow-by. Stock is right at the bottom of the heads but the bike doesn't rev past 6k rpm and doesn't see a lot of crankcase pressure like in forced induction which is where it tends to get worse. I don't see the point unless you want more chrome or you're seeing a lot of oil in the intake area.

  7. #6
    Site Elder rbthntr64's Avatar
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    Quote Originally Posted by DreamStreak View Post
    No it isn't. There is no crankcase "breather". It is a crankcase evacuation hose that goes from the crankcase to the air intake. I have my reed valves removed and still use the original crankcase evacuation hose.
    OK, maybe not techically a "breather", But mine ran up the front of the engine, over the top to a valve that ran to the reeds and to the intake. Got rid of alot of extra crap that is no longer necessary with my configuration.
    2002 Mean Streak 1500, Custom Flame paint, Stebel Horn, Kuryakyn ISO Flame grips, MS Demon Shield, PCIII USB, Muzzy 2:2, Custom FC's , 04 Suzuki Boulevard headlight, Thunder Tornado intake w/ Forcewinder filter and left side. BikeMaster torpedo LED Signals. Clear alternative integrated tail light, Refined Cycle risers, VTX Shocks, Muzzy Drag pipes, Dakota MCV-7400 gauge, relocated regulator, Metric Jockey chin faring, Chuckster Chain Tensioner UPGRADE,
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  8. #7
    Supreme Being streak07's Avatar
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    Thats the air intake to the reed valve system and why marbling will disable it. The breather tube should still be there and is separate.

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    Site Elder rbthntr64's Avatar
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    I'll pull my tank when I get home and take a pic. Not sure if the 1600 is the same configuration as the 1500, and standard to Kalifornia compliant ones. There was only one hose from the front of the engine, two that split off to the reeds, and one that ran to the AIS crap. Four total, NO MAS!

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    Quote Originally Posted by rbthntr64 View Post
    I'll pull my tank when I get home and take a pic. Not sure if the 1600 is the same configuration as the 1500, and standard to Kalifornia compliant ones. There was only one hose from the front of the engine, two that split off to the reeds, and one that ran to the AIS crap. Four total, NO MAS!
    got to see this.
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    Up-And Comer Ranger's Avatar
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    Howdy hey Streak07 and DreamStreak just to make sure I don't mess anything up, I can go ahead and disconnect the reeds without risking overpressure at the crank correct? I have not had the need to do it yet since I am undicided about what intake to install but would like to be rid of them noisy critters nevertheless, intake or not.

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    Site Elder DreamStreak's Avatar
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    You can take the reed valves off without worry. The reed valves are not noisy by themselves, but will cause popping/backfiring out the exhaust with aftermarket pipes (does it with stock pipes too, but the stock exhaust muffles that sound). You aren't talking about the idle control solenoids are you? They are under the right side intake cover, noisy, and usually disabled when adding an aftermarket intake.
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  13. #12
    Up-And Comer Ranger's Avatar
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    DreamStreak I do believe you nailed it, they are inded the idle control selenoids and you are absolutely correct about the noise they make specially when sitting at idle or coasting along at lower speeds since there is not enough wind or exhaust noise to cover it up. Since I am not modifying the intake to a cadmann or aftermarket for the time being, can I still be rid of those? I was well on the way to doing so before the crank breather subject came up and left me doubting wether or not I can do the one without the other (Disconnecting without new intake). Being new to the Meannie I place my trust on you (You guys know your stuff) rather than taking a guess and have things go haywire. Thanks for the help.

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    Quote Originally Posted by Ranger View Post
    DreamStreak I do believe you nailed it, they are inded the idle control selenoids and you are absolutely correct about the noise they make specially when sitting at idle or coasting along at lower speeds since there is not enough wind or exhaust noise to cover it up. Since I am not modifying the intake to a cadmann or aftermarket for the time being, can I still be rid of those? I was well on the way to doing so before the crank breather subject came up and left me doubting wether or not I can do the one without the other (Disconnecting without new intake). Being new to the Meannie I place my trust on you (You guys know your stuff) rather than taking a guess and have things go haywire. Thanks for the help.
    I took 2 fuel resistant hoses about 8" each in length, put one on each of the outlets of the solenoids then stuck them in the crossover tube..All the noise vents in there and took 98% of the noise away..Considering you're in a warm climate, I believe you can get away with eliminating the solenoids all together..The hoses are the quick and dirty method though

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    Rasmith, Just trying to put 2 and 2 together here! Are you running a stock intake set up? If so go back to the thread on the $40 dyno. I believe something was causing a rich mixture! Maybe it's because you have blocked probably a third of your air intake on an already restricted system. It might be part of your problem.
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    Quote Originally Posted by madperson View Post
    Rasmith, Just trying to put 2 and 2 together here! Are you running a stock intake set up? If so go back to the thread on the $40 dyno. I believe something was causing a rich mixture! Maybe it's because you have blocked probably a third of your air intake on an already restricted system. It might be part of your problem.
    lol..No I was only rich on idle..THen when I cobbed the throttle it went lean and took a while to recover because I had the 2nd pot too low.

    I now have the PC3 in and have been playing with maps..Found a good one and put in the accelerator pump..very sweet!!!

    I have absolutley no air restrictions..Check out the pics below..


    P1010054.jpgP1010106.jpg
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    Last edited by Rasmith; 05-02-11 at 07:41 PM.
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