1. 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.

#3 cyl weak compression...any sugestions?

Discussion in 'XJ Technical Chat' started by regunner, Sep 21, 2008.

  1. regunner

    regunner New Member

    Messages:
    15
    Likes Received:
    0
    Trophy Points:
    1
    Location:
    Oregon
    Resurecting a 1980 650 maxim. # 3 cyl at only 40 psi dry, others at 90+
    Oil in cyl does help...pumps to 80-90? suspect rings...have ridden as is ten or more times and changed the oil twice since getting running months ago. Anyone have any luck with oil additives or ? I don't want to tear apart..will part out or swap engines otherwise. Thanks.
     
    regunner, Sep 21, 2008
    #1
  2. RickCoMatic

    RickCoMatic Well-Known Member

    Messages:
    13,843
    Likes Received:
    65
    Trophy Points:
    48
    Location:
    Massachusetts, Billerica
    Those Compression numbers are far below MINIMUM.

    If you do get the Bike running at those numbers ... it won't run for very long.

    If you don't want to do a Ring Job ...
    You have to find a replacement engine.

    Don't buy a replacement engine without the Seller verifying some good Compression Numbers IN WRITING.
    You don't want to start buying bad engine's.
    It happens!
     
    RickCoMatic, Sep 21, 2008
    #2
  3. Captainkirk

    Captainkirk Member

    Messages:
    737
    Likes Received:
    3
    Trophy Points:
    18
    Location:
    Northeast Illinois
    Re-ringing is really easier than it soumds, and like Rick says, you might be swapping one bad motor for another. Usually symptoms like yours are not indicative of severe cylinder wear, more than likely it's stuck rings or misaligned ring gaps, and all the cylinders need is a quick once over with a flex hone, new rings fitted, and slap it back together. Just sayin'.......
     
    Captainkirk, Sep 21, 2008
    #3

Share This Page