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Thread: blowing oil through crankcase breather

  1. #1
    Join Date
    Nov 2013
    Location
    Miami Florida
    Posts
    5

    blowing oil through crankcase breather

    Can anyone tell me the symptoms of blowing oil throigh my crankcase breather? 06

  2. #2
    Join Date
    Nov 2006
    Location
    West Union, Ohio
    Posts
    1,889
    Your getting "blowby". It can be caused by a few things. Crank seals, a pressure releif valve thats not operating correctly, or at worst case you could be due for a top end rebuild.
    2009 CRF450 Full TI yosh and Remapped

    2001 CR250 Single track bike

  3. #3
    Join Date
    Nov 2010
    Posts
    1,657
    Also over filling your oil will do this as well. lots of people put a whole qt in their crank side and end up with a oil blowing out when the pressure builds.

  4. #4
    Join Date
    Nov 2006
    Location
    West Union, Ohio
    Posts
    1,889
    agreed that is actually a very common mistake. These motors dont hold much so too much or too little can make a mess of things in different ways haha
    2009 CRF450 Full TI yosh and Remapped

    2001 CR250 Single track bike

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