Question about 2004 Yamaha YZ 250 F

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Oil leaking out of overflow

I have a 2002 yamaha wr250, it sat for 2-3 months. when i started riding it again the oil started leaking out the overflow line. it is not over filled. does anyone know if a line would be plugged up or the filter blocked???


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  • holdem27 Jan 25, 2009

    My 250 wr Before putting it away for the winter I wanted to check the oil to make sure it had no water in it.. oil which previously appeared on the dip stick (on the frame) was low... I added and added, before it showed? Yesterday during my mid winter warm up oil spewed out everywhere and it smoked like a 72 Omni.
    I checked the oil after it warmed up , magically it was right full. I drained it down till it was midpoint on the dip stick, started it and it ran clean, then started to smoke and blow oil every-where, again the dip stick indicated it was over filled....???
    It is my first 4 stroke and I,m lost, help...

    Barry Bremner

  • Anonymous Feb 17, 2009

    I have a 2001 YZ 250F i was rinding it one day and oil came out the overflow tube? does that tube come out of the top cyclinder

  • joe May 11, 2010


    make sure you are checking the oil when the bike is level AND be sure to know if the oil dipstick needs to be threaded in or just placed in the reservoir to take the reading. some bikes you just place it in and remove; others you threaded it in, then unthread and make the reading.

    if you want to be sure you have the right amount, drain it all out, then refill with the recommeded amount. see where it is on the dipstick, then let it sit a day or two. take another reading and see if it dropped or remained the same.

  • joe May 11, 2010

    are we talking oil or gas out of the overflow line?

    if oil, was it stored outside? maybe water got into the cylinder and into the oil through the spark plug hole or carb during bad rainy weather? i would drain the oil and not only measure the quanty removed from the bike, but also look to see if you see water in the oil.

    if fuel, let us know and we can provide troubleshooting steps.



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Just check the crankcase filter to make sure it isn't stopped up if it is that will make the crankcase build up pressure and blow the oil out

Posted on Jan 28, 2009


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