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850 MNS Final Drive issue

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  • 850 MNS Final Drive issue

    I managed to get a good deal on a final drive for an 850 MNS. In comparing the shaft length to the tech tip, I am a bit confused. The 750 FD is said to be 10-13/16", and the 1100 FD is said to be 10-1/8". However, the 850 FD that I got is MUCH shorter, and has one end that looks like the 1100 shaft, and one end that looks like the 750 shaft. The 850 shaft I have is 9-7/16" long.

    What does this mean for adding the copper spacer to the 1100 shaft?





    1980 XS850SG - Sold
    1981 XS1100LH Midnight Special (Sold) - purchased 9/29/08
    Fully Vetterized and Dynojet Kit added, Heated Grips, Truck-Lite LED headlight, Accel Coils, Irridium plugs, TKAT Fork Brace, XS850LH Final Drive & Black SS Brake lines from Chacal.
    Here's my web page devoted to my bike! XS/XJ User's Manuals there, and the XJ1100 Service Manual and both XS1100 Service manuals (free download!).

    Whether you think you can, or you think you cannot - You're right.
    -H. Ford

  • #2
    Well, after finding an old thread about XSChop's research on this mod, I think I have answered my own question, but I'm still not 100% sure... It appears that the XS850 has the same yoke as the XS11, but the FD end is the same as the XS750. That tells me that I still need to add the 16mm spacer and 2 o-rings to make up for the added depth that the shaft sits into the FD (as compared to the XS11 FD).

    The part I don't understand is why, if the 750 shaft is longer than the 1100 one, is the 850 shaft shorter?? Did it have a shorter wheelbase than the 750 & 1100?
    1980 XS850SG - Sold
    1981 XS1100LH Midnight Special (Sold) - purchased 9/29/08
    Fully Vetterized and Dynojet Kit added, Heated Grips, Truck-Lite LED headlight, Accel Coils, Irridium plugs, TKAT Fork Brace, XS850LH Final Drive & Black SS Brake lines from Chacal.
    Here's my web page devoted to my bike! XS/XJ User's Manuals there, and the XJ1100 Service Manual and both XS1100 Service manuals (free download!).

    Whether you think you can, or you think you cannot - You're right.
    -H. Ford

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    • #3
      Maybe you need a new tape measure??? LOL
      '81H (my first XS ) "Grey Ghost"
      Stock Pilots/ 110 mains (to change)
      4:1 Jardine w/ headerwrap
      Windjammer(wiring issues)
      SonyMarine unit for Ipod/Polk Speakers
      New paint/brakes to come!!
      ===============
      '80G FrankenBike (parts bike)
      ===============
      '80G to fix "BlackSunshine"
      Stock Pilots/125 mains
      Pod filters; 4:1 Kerker??
      SS Brake lines w/ new M/C's
      LED Brake Lite
      Needs paint....

      It is better to be thought a fool than to open ones mouth and remove all doubt....

      Comment


      • #4
        Originally posted by CatatonicBug View Post
        Well, after finding an old thread about XSChop's research on this mod, I think I have answered my own question, but I'm still not 100% sure... It appears that the XS850 has the same yoke as the XS11, but the FD end is the same as the XS750. That tells me that I still need to add the 16mm spacer and 2 o-rings to make up for the added depth that the shaft sits into the FD (as compared to the XS11 FD).

        The part I don't understand is why, if the 750 shaft is longer than the 1100 one, is the 850 shaft shorter?? Did it have a shorter wheelbase than the 750 & 1100?
        I'll measure Little Mo and post an answer latter. I can tell you XSCHOP's directions are right on when using an 850 rear end for the mod!

        Deny
        1978 XS1100E - The TimeMachine
        1980 XS850 Special - Little Mo

        Comment


        • #5
          The early 750's had a CV type of joint at the engine end of the drive shaft, so the shaft is a different length. The 850 shaft is not the right length either. Use the 1100's shaft and all will be good. I have done 4-5 of these mods, and Chop's instructions are right on.
          Last edited by John; 07-30-2010, 07:24 PM.

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