1. Some members were not receiving emails sent from XJbikes.com. For example: "Forgot your password?" function to reset your password would not send email to some members. I believe this has been resolved now. Please use "Contact Us" form (see page footer link) if you still have email issues. SnoSheriff

    Hello Guest. You have limited privileges and you can't "SEARCH" the forums. Please "Log In" or "Sign Up" for additional functionality. Click HERE to proceed.

Help With Carb Sync & Cam Chain Tensioner

Discussion in 'XJ Technical Chat' started by fastridingman, Sep 30, 2008.

  1. fastridingman

    fastridingman New Member

    Messages:
    3
    Likes Received:
    0
    Trophy Points:
    1
    Hi Everyone,

    I just picked up an '81 XJ650H Maxim and joined your group. I do not think it has YICS. :?: Can anyone direct me to instructions on how to sync the carbs? I'm borrowing a digital sync tool but I'm not sure what to adjust on the carbs.

    Also, I believe the motor has a manual cam chain tensioner. :?: Can anyone tell me how to adjust it.

    I haven't been able to find a shop manual for the bike yet.

    Thanks Much
     
    fastridingman, Sep 30, 2008
    #1
  2. bill

    bill Active Member

    Messages:
    2,813
    Likes Received:
    0
    Trophy Points:
    36
    Location:
    Raleigh, NC
    Basic sync process http://www.xjbikes.com/Forums/viewtopic ... =sync.html

    If your tensioner is a manual adjust http://www.xjbikes.com/Forums/viewtopic ... chain.html

    If it is an automatic here are Rickcomatic's instructions:

    Simple.
    Pull the Plugs.
    Pull the Ignition Crankcase Cover.
    Wrench the Engine over two full revolutions in its normal rotation.
    Come to a smooth and gradual stop.

    Reverse the direction and jack-over the engine backward in a sudden movement.
    This will present the slack in front of the tensioner and it will automatically take up the slack.

    Repeat several times.
    Have an assistant tap on the Tensioner with the butt of a hammer handle while you are reversing the direction on the engine.

    The tensioner should take-up the slack and life in Iowa will be better and less noisy.
     
    bill, Oct 2, 2008
    #2
  3. flash1259

    flash1259 Member

    Messages:
    661
    Likes Received:
    1
    Trophy Points:
    16
    Location:
    W.R. Wisconsin
    Bill can't that also be done withoutdoing all that?

    i mean in gear rolling forward then push backward quickly?

    just curious
     
    flash1259, Oct 2, 2008
    #3
  4. Ass.Fault

    Ass.Fault Active Member

    Messages:
    1,028
    Likes Received:
    1
    Trophy Points:
    38
    Location:
    College Station, Texas
    maybe fifth or fourth gear
     
    Ass.Fault, Oct 2, 2008
    #4
  5. bigfitz52

    bigfitz52 Well-Known Member Premium Member

    Messages:
    21,283
    Likes Received:
    418
    Trophy Points:
    83
    Location:
    Rural SE Michigan 60 miles N of Motown
    The 'roll forward, push back' procedure is to suddenly reverse the direction of the motor's internals so that slack in the camchain is suddenly in front of the AUTOMATIC tensioner. The manual tensioner requires a different procedure, see the link Bill posted. If your bike doesn't say "YICS" on the valve covers and the side covers somewhere, it probably ISN'T so equipped.
     
    bigfitz52, Oct 2, 2008
    #5
  6. bill

    bill Active Member

    Messages:
    2,813
    Likes Received:
    0
    Trophy Points:
    36
    Location:
    Raleigh, NC
    It's not hard but as Fitz said you need to know if you have the manual or automatic. Mine is an 82 and is automatic. The 81s I believe did not have the YICS engine but I can;t swear the tensioner is manual
     
    bill, Oct 2, 2008
    #6
  7. fastridingman

    fastridingman New Member

    Messages:
    3
    Likes Received:
    0
    Trophy Points:
    1
    Thanks! I appreciate the help.
     
    fastridingman, Oct 2, 2008
    #7
  8. switch263

    switch263 Member

    Messages:
    525
    Likes Received:
    0
    Trophy Points:
    16
    Location:
    Austin, TX
    I can't speak for the maxim's, but my 81 750 seca has both YICS and an automatic tensioner, for whatever that's worth.
     
    switch263, Oct 2, 2008
    #8

Share This Page