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The SG's Top End Swap out.

Discussion in 'The Garage' started by azman857, Oct 12, 2019 at 7:49 PM.

  1. azman857

    azman857 '80 XS 650SG Rider Top Contributor

    Well, after a good night's sleep and the Sat morning Carl's Jr breakfast I blew of 2 car shows and dived into the swap out. The previous night, I had started prepping. Removed the tank, the exhaust and started disconnecting electrics. Today, the rest of the stuff in the way of engine removal got out and the engine is removed. After lunch the valve cover was removed. Seems the rockers were wearing out on the cam. A distinct wearing line about mid pad. I got the cylinder block off with the head. for some reason the head is stuck on. Pistons look OK. Some minor scuffing. Normal wear stuff. I'll measure it all out later. Yes, pics are coming.
     
  2. Mailman

    Mailman Hardly a Guru Top Contributor

    Nice! I’m following! :popcorn:
     
    Last edited: Oct 13, 2019 at 8:15 AM
    Wulfbyte, Jim and gggGary like this.
  3. azman857

    azman857 '80 XS 650SG Rider Top Contributor

  4. 5twins

    5twins XS650 Guru Top Contributor

    17,933
    7,857
    688
    And the reason for all this is? You mention in your sig having a 256 cam so you must have been in there already.
     
    Wulfbyte and JAX71224 like this.
  5. YamadudeXS650C

    YamadudeXS650C Central New York XS650 Top Contributor XS650.com Supporter

    I'm watching, too.:popcorn:
    BTW, you're gonna need a whole bunch of little tupperware containers. ;)
    .
    .
     
    Mailman, Wulfbyte, Jim and 1 other person like this.
  6. azman857

    azman857 '80 XS 650SG Rider Top Contributor

    I was so surprised to find my front cam chain guide was in perfect condition! As one can see, this is happening in my bikeport. No cars allowed so it's not a car port. I still have to finish the rocker arm mods for the bigfoot adjusters with the thinning of the end of the arm to aprox 8.5 mm and assemble the head with the installation of the valves. I did install the pistons into the cylinders last night.
     
    MaxPete and gggGary like this.
  7. azman857

    azman857 '80 XS 650SG Rider Top Contributor

    The reason for all this is because of low power. I got tired of quickly losing speed when climbing hills. The installed the 256 cam during the last engine update. Next to the installation to the PAMCO with Electronic Advance as to one of the best things I've done for this engine. A compression check some time back was around 120-125. Not knowing if it was due to rings or valves, I thought it best to swap it all out.
    Tupperware? I don't do Tupperware. That and the reason I don't plan on being off the road that long. Temps are in the low 90's- Upper 80's around here. That's riding time!
     
    MaxPete, Mailman and gggGary like this.
  8. 5twins

    5twins XS650 Guru Top Contributor

    17,933
    7,857
    688
    I thinned out the whole end of the rocker on my first couple elephants foot adjuster installs .....

    [​IMG]

    ..... but I don't do it that way anymore. Now I just bevel cut into the bottom of the rockers with a tapered stone in a die grinder .....

    [​IMG]

    [​IMG]

    [​IMG]

    This has a couple advantages. First, you're not removing as much material as before, and second, it can be done with the rocker still installed in the top cover. You just wrap rags all around it .....

    [​IMG]

    [​IMG]
     
    nj1639, MaxPete, Rasputin and 2 others like this.
  9. TwoManyXS1Bs

    TwoManyXS1Bs BBQ Hunter Top Contributor

    What became of the wristpin clips?
     
    Jim and gggGary like this.
  10. azman857

    azman857 '80 XS 650SG Rider Top Contributor

    TM It's just the rings area that are in the cylinder block. Just the inner clips are installed
     
    Jim likes this.
  11. MaxPete

    MaxPete Life with Lucille...I suggest, she decides. Top Contributor XS650.com Supporter

    YUP - this is how the adjusters on Lucille were done and it seemed to work out great!

    Pete
     

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