Question about 1985 Yamaha XJ 700 X Maxim

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1978 Yamaha XT500 Oil in frame; Pukes oil up into intake...

At the back of the crank case there is a puck looking thing with nothing inside of it and it's connected to the bottom of the air box. It sometimes works fine and sometimes it pukes oil...Found a plugged crank case vent tube, but, no difference... Just kicking over can make it puke oil. The dipstick is up by the handle bars and the level fluxuates up and down depending on if it is puking or not. Runs good when it does run, decent compression,, can't remember the psi though..Can't find any info in the book about oil in frame system. I even took it to 4 seasons,,Guy thought it was valve guides..or rings... Is there a valve I don't know about? Is there a website that explains the principals of it's opperation?
Any Ideas would be greatly appreciated..
P.s. just ignore the xj700 maxim...

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  • kennyport May 16, 2009

    oil in tank drains into crankcase and spews out of crankcase breather when kicked over. Why is this happening?.Any ideas?

  • Rauben Rib Creed May 15, 2014

    Drained all oil and filled with correct amount and ignored dipstick level until after running it. It runs Great now!!!


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You have to much oil in your carter.

Posted on Jul 19, 2009

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I have resently read on-line that if the ball ck. goes bad does not seat that oil in your tank or frame in the xt-tt will leak all to the crank case.It is lockated in your cluchcover case feed going in to your fillter I hve personaly never have had this proplem it is a closed system

Posted on Mar 20, 2012

  • sam pinckard
    sam pinckard Jul 20, 2012

    tt sr xt are dry sump when they sit for along time they will bypass through ck valve called wet-sumping

  • sam pinckard
    sam pinckard Nov 15, 2014

    update if you pull the plastic right hand plug out and oil comes out more than likely the ball ck. seal needs replaced by taking the right clutch cover off


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