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Smiles' Top End Rebuild Thread

Discussion in 'The Garage' started by smiles79, Oct 3, 2018.

  1. JimD54

    JimD54 Screws fall out. It's an imperfect world.

    My opinion... I'd run it. several times. Reason being, you want the oil to splash around and coat everything that you cleaned and is not currently coated. Otherwise you're looking at internal corrosion. Getting it hot opens the "pores" of the metal. Coating would be more thorough.
    TwoManyXS1Bs, 59Tebo and gggGary like this.
  2. 5twins

    5twins XS650 Guru

    No, I don't think that would matter. But, then you'd have carbs to drain and set up for winter storage. I imagine they're all drained and dry right now. *Edit - but Jim makes a good point about thoroughly coating everything with oil, and having it hot during that.
    gggGary and 59Tebo like this.
  3. Think of it as an adventure............As long as there is no ice on the road.

    Wouldn't be a bad thing to run in the air cooled engine in a cooler environment............
    gggGary and 59Tebo like this.
  4. azman857

    azman857 '80 XS 650SG Rider

    Besides, You do all that work doing the top end and you will want to hear the fruits of your labor. Maybe get that ride in before the first snow or ice on the road..
    gggGary and Meddy like this.
  5. Initial run on a fresh overhaul will be hot, rings breaking in. Shut it down when it gets hot, maybe a couple minutes. If it doesn't start and run, problems. Tackle those now during the winter nonriding/rebuild period...
    gggGary, Meddy and JimD54 like this.
  6. smiles79

    smiles79 XS650 Addict

    Does anyone have any advice for removing the rocker box stud hole sleeves? They seem to be stick in there, would a little heat be safe?

    Also, the o rings that I got in my kit that seem to be the right fit are a little thinner than the stock ones. Also they're black instead of red. Is this ok?
  7. Last edited: Nov 10, 2018 at 6:08 PM
    gggGary likes this.
  8. 5twins

    5twins XS650 Guru

    Honestly, if you don't plan on pulling the rocker shafts and rocker arms, I wouldn't even disturb those sleeves. And there's really no reason to pull the rockers unless some are bad and being replaced. Undisturbed, I think the originals will continue sealing just fine. Besides the o-ring, you're going to have gasket sealer all over the bottom lip of that sleeve too when you reassemble things.
    grizld1 and gggGary like this.
  9. smiles79

    smiles79 XS650 Addict

    Thanks for your guys' responses.

    5twins, I ended up getting them out before I saw your response. Here's to hoping they still seal alright!
  10. smiles79

    smiles79 XS650 Addict

    Didn't mention earlier, I got the can chain guide installed earlier today! It's centered-ish, but I'll double check it when the jugs are on.

    Attached Files:

  11. Superjet

    Superjet XS650 Addict

    Smiles you want it centered for sure. This is what I found in mine when i got it last winter from the p.o. not good. Now this one will be used to mod with the SR guide!! Message_1517070681584.jpg
    GLJ, smiles79, 59Tebo and 1 other person like this.
  12. smiles79

    smiles79 XS650 Addict

    Yeah, I'll make sure it's centered. What's the best way to do that?
  13. 5twins

    5twins XS650 Guru

    Carefully measure the gap between the side of the guide and the tunnel on both sides, and where the guide sticks out of the cylinders at both the top and bottom .....


    It's often asked if the guide can be replaced without pulling the cylinders off. My answer to that is no, not if you want to be sure it's mounted straight. There's no way to check/measure the bottom if the cylinders are in place.

    I've been gathering together the old, trashed guides I have. So far, I've found 5. 4 out of those 5 show rub marks on the side rails, evidence they were mounted crooked. As far as I can tell, these were all original factory installed guides. What this is telling me is that Yamaha didn't even bother centering these things when the bikes were produced, lol. We can do better.

  14. Superjet

    Superjet XS650 Addict

    Man out of everybody you think yamamama would know!!! Guess you guys have one up on them lol :laugh2:
    JimD54 likes this.
  15. 59Tebo

    59Tebo 59Tebo

    Like eating a dish in a restaurant, then, cooking the same thing at home; much better. The missing ingredient? Love. And we love our Xs's! :heart:
    TwoManyXS1Bs, gggGary, GLJ and 2 others like this.

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