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engine gasket replace

Discussion in 'The Garage' started by 650gts, Jan 27, 2020.

  1. 650gts

    650gts XS650 Member

    I have a low mile '78 that runs pretty good.
    The gaskets are original and a little leaky. I want to go through and replace with a kit.

    What would be the best resource for me to look at for this?
    Mailman likes this.
  2. gggGary

    gggGary Stop that! XS650.com Supporter Top Contributor

    Last edited: Jan 28, 2020
  3. kshansen

    kshansen XS650 Junkie Top Contributor

    I like gggGary's suggestion to torque head and inspect or replace the clutch push rod seal before opening up a good running engine.

    Maybe I'm a bit on the lazy side, well not just a bit!, but if it was mine I just ride it and wash it when it got looking a little messy. Might be my age but if I was feeling good enough to ride I'd rather ride than wrench!

    If you really want to be wrenching on something find a second bike to work on. Then once that one is in perfect shape ride that while fixing the first one!
    Jim, lakeview, GLJ and 1 other person like this.
  4. gggGary

    gggGary Stop that! XS650.com Supporter Top Contributor

    Mailman; don't you have typical gasket, seal replacement rounded up into a thread somewhere?
    In general kits are not the way to go, at least for what you have in mind here.
    Jim likes this.
  5. GLJ

    GLJ Never go faster than your guardian angle can fly. Top Contributor

    I think these are the seal threads you are thinking of.

    I respectfully disagree with that. If he's going to keep the bike for the long term it's the way to go. If you have the kits you should have whatever you need. Spare parts are a good thing. Nothing worse than realizing you forgot to order something after you've tore the bike apart.:doh:
    Jim likes this.
  6. gggGary

    gggGary Stop that! XS650.com Supporter Top Contributor

    Well if he's going to open a motor a complete motor overhaul gasket seal set.... isn't a bad idea, but often the threads above cover more than 80%? of typical leaks.
    Jim and GLJ like this.
  7. 650gts

    650gts XS650 Member

    Jim likes this.
  8. 5twins

    5twins XS650 Guru Top Contributor

  9. Machine

    Machine Race the wind Top Contributor

    That manual is for the XS'E standard model. Is that what you have or is it a "Special"
    And, what is "low mileage" ? Under 10k ?
    Jim likes this.
  10. grizld1

    grizld1 Grumpy old man Top Contributor

    If you want the best, get a copy of Hans Pahl's The Yamaha XS650 Engine. It contains detailed directions for takedown and assembly, and describes systems and defects to look for, all logically organized and supported by clean color photos. You get what you pay for, and at $32 from Amazon, the book is a bargain.
    Superjet and Jim like this.
  11. 650gts

    650gts XS650 Member

    Yeah, I have the 78 Special. Under 10k miles.
  12. Jim

    Jim Beyond the edge is the unknown. Here be Dragons XS650.com Supporter Top Contributor

    I've still got this Clymer manual for sale.
    Welcome to the forum! We love pics here.... :whistle:
    Machine likes this.
  13. 5twins

    5twins XS650 Guru Top Contributor

    As far as factory manuals go, not every year and model got it's own full manual. Full manuals only came out every few years and small "supplements", maybe 10 to 20 page publications, were put out to cover the in between years and models. These were made to be used along with the last full manual and only list any differences or changes in the newer model. You're in luck that '78 happens to be a year that a new full manual came out. But, it covers the Standard model so you will need the Special model supplement along with it. Luckily, many of the supplements are included in the publications. Here's one to watch. It is the full '78 E manual and includes supplements for the '79 and '80 models. It should also have your '78 SE supplement in there .....

    gggGary and Jim like this.
  14. Jim

    Jim Beyond the edge is the unknown. Here be Dragons XS650.com Supporter Top Contributor

    That's the manual I have. Right now there's no bids with 2 days left. You could bid 13 bucks and with the 3 bucks shipping, that would be a smoking deal!!
    Raymond likes this.
  15. 5twins

    5twins XS650 Guru Top Contributor

    I think this is one of the best manuals to get, the '78 full manual with supplements up to at least the 1980 models. 1980 was a big change year for the 650. It got different carbs, electronic ignition, and several charging system changes. A manual like this will cover all this plus the earlier versions.

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