Question about 1979 Yamaha XS 650 SF

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Two questions: Oil leak from top of engine; bike shut down ridin

Two questions: First one I have an oil leak coming out of the area directly above the exhaust pipe on the right side. It is coming out of the area with a cover with some bolts holding it on. Runs out of here then down across the engine eventually making it to the kick stand. Do you think this is a gasket or head gasket problem?
Second I was riding other day and all of a sudden bike shut down no electric or power, coasted to a stop and couldn't start again. Noticed that positive battery terminal was loose? Could this be the problem or do you think other??? 1979 Yamaha 650 Special
Thank you

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  • tmlane_23 Jun 28, 2009

    Thank you for the information. I have a friend who has been helping me with things but I am trying to learn how to do some things on my own. Do you know what type of gasket that I would need to get for this/where I can get one? I have not taken the cover off to see what is underneath it yet,
    Thanks again so much for the information, please let me know anything you can about the valve gasket that I may need. Also thanks for the battery info.

  • thomas foster
    thomas foster May 11, 2010

    the battery was your problem with the bike cutting out the valve cover leaking those cover didnt have a gasket they use silicone to seal them i woul pull the tank and take he cover off and reseal it first make sure your bolts are tight the best thing to seal it with is yahmabond you can buy it at any yamaha dealer that stuff works great and oil does not effect it i use it on my race bike be sure to check your oil level if it has been leaking for awhile



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The battery terminal being loose would cause that, since the rectifier would freak out. the leak you speak of is probably not eh head gasket ro you would have compression problem with amount of oil that can run down the bike. It sounds like a corner on the valve cover gasket or something I think there is a cover for the valve adjust ment there so check it out the gasket may be worn. no biggie get a new one.
help this helps

Posted on Jun 28, 2009

  • Carl Holland Jun 29, 2009

    Not a problem, for the gasket check out they have pretty much every thing for older bikes


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Dude go to for damn near any part you need as long as it is for an xs 650.

Posted on Jul 21, 2009


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