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'82 XJ 750 squirts oil from crankcase breather. HELP!!

Discussion in 'XJ Technical Chat' started by Bozz, Mar 16, 2015.

  1. Bozz

    Bozz New Member

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    Over this past fall I bought a 1982 XJ 750 Maxim to accompany my current XJ 550 Maxim I have of the same manufacturing year. when I bought it, the intake box and filter was off of the bike and they had makeshift 'pod' filters over the 4 carb intakes. (they tied painters breathing masks over them. seriously?!) at that time he started the bike off of jumping it from his truck. it sat through the winter in a non heated garage, but I did put a gasoline treatment in it when I stored it. I put actual pod filters over the carbs but had not yet put a crankcase breather filter over the tube coming out of the crank case. I started it for the first time yesterday and it immediately started running at high RPM, like 8K or more. Then large amounts of oil (about a half a quart in around 20 seconds) started shooting out of the crankcase breather tube. I assume the high RPM came from air flowing at higher volume through the carbs and I need to adjust the air/fuel ratio. but what could cause that oil to come out like that? Has anyone else experienced this? Any suggestions?? Thanks for your help!
     
    Bozz, Mar 16, 2015
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  2. FtUp

    FtUp Well-Known Member

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    welcome to the forum. excessive blow by past the rings will cause what you describe.

    FU
     
    FtUp, Mar 16, 2015
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  3. Bozz

    Bozz New Member

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    Thanks FU, what do you think? Should I begin thinking about tackling putting on new piston rings? Id rather not, but if I have to...
     
    Bozz, Mar 16, 2015
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  4. FtUp

    FtUp Well-Known Member

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    I would start with a compression check, both dry then wet. see if you have low compression.

    FU
     
    FtUp, Mar 16, 2015
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  5. MiCarl

    MiCarl Active Member

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    Check the oil level. Good chance your gasoline ran into the crankcase over winter and it's quite full now. Most common reason for your problem.
     
    MiCarl, Mar 16, 2015
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    k-moe likes this.
  6. k-moe

    k-moe Pie, Bacon, Bourbon. Moderator Premium Member

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    What he said. ^^

    You should plan to to a thorough check of everything before starting the engine again.

    http://www.xjbikes.com/forums/index.php?threads/in-the-church-of-clean.14692/

    http://www.xjbikes.com/forums/index.php?threads/the-information-overload-hour.27544/

    The higher RPM on startup is more likey due to an improperly set idle speed adjuster, or due to a vacuum leak. Take no shorcuts, and find yourself a good airbox.
     
    k-moe, Mar 16, 2015
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    jmilliken likes this.

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