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  1. #1

    Member #
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    2001 Red CBR 1100xx
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    Can't keep tight chain somtimes

    A lot of times when my chain gets loose, all I have to do is loosed the axle bolt and pull the wheel back and the chain is tight again. It is like the wheel is moving forward a little bit. How can I prevent this?

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  3. #2
    follically challenged
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    97 Honda CBR1100XX, 91 Kawasaki GPZ500S
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    Re: Can't keep tight chain somtimes

    how old is your chain? in miles/km....

    maybe it´s worn out and is increasingly becomming longer and longer.
    500px
    skype: heistinger
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  4. #3
    Craig
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    383
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    2001 XX 1987 VF700C Magna
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    Re: Can't keep tight chain somtimes

    Tighten the adjusters snug AFTER you tighten the Axle.

    This will put the force on the adjusters in tension, rather than just the axle in

    compression.

    After that is done, how old is your chain? When adjusted, are the wear marks

    in the red or green zones? Is there a rust colored dust showing on the chain

    and wheel? These are indications of a wearing chain. Once they reach a

    point, they seem to wear fast.

    My first chain went out at 18K miles, I didn't take care of it.

    I'm at 42K now, and still in the green with no stretched points.

  5. #4

    Member #
    4644
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    between bikes
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    Re: Can't keep tight chain somtimes

    Check your adjust threads/holes. You pull chain and that has some force to push the axle forward and trump the threads is she may not have proper thread integrity at the touch points at the axle is I would check those two screw holes is push them back and forth or take a hammer to them is tap for sure! (day stay in place is)

  6. #5

    Member #
    4058
    Bike(s)
    Black 99' blackbird, Blue 00'Blackbird
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    Jul 08 2008
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    Te awamutu ,New Zealand
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    Re: Can't keep tight chain somtimes

    Once you have tighted chain & adjusters are you applying the correct amount of torgue to the axle nut?

    I have had this happen to me before ( chain losing tension ) & to my horror it was not enough torgue!!

  7. #6

    Member #
    129
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    2001 Red CBR 1100xx
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    Re: Can't keep tight chain somtimes

    Brand new ZVM2 DID chain. My last ZVM2 lasted 50,000 miles, due to the pro-oiler. When I am done adjusting the chain I tighten the axle nut, then I turn the adjusters on both sides counterclockwise until they are tight. Could it be high speed riding? I hardly ever ride the bike when I don't hit 110-150mph. Not for long periods of time though, too risky. My torque wrench broke, so I just tighten it almost as snug as I can get it, but not with a big wrench, you may have hit on something. What is the torque? 80 foot lbs.

  8. #7

    Member #
    4058
    Bike(s)
    Black 99' blackbird, Blue 00'Blackbird
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    Re: Can't keep tight chain somtimes

    Quote Originally Posted by DanS View Post
    Brand new ZVM2 DID chain. My last ZVM2 lasted 50,000 miles, due to the pro-oiler. When I am done adjusting the chain I tighten the axle nut, then I turn the adjusters on both sides counterclockwise until they are tight. Could it be high speed riding? I hardly ever ride the bike when I don't hit 110-150mph. Not for long periods of time though, too risky. My torque wrench broke, so I just tighten it almost as snug as I can get it, but not with a big wrench, you may have hit on something. What is the torque? 80 foot lbs.

    Snug tight don't cut it Bro !! the amount of pressure generated by just legal cruising will be enough to slacken off chain... YOU MUST USE A TORQUE WRENCH.

    92F LBS I think, check with owners manual

  9. #8

    Member #
    1728
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    81,82,83 CBF's, 98 CBRxx, 07 CBR-1000RR/R, 83 FXSB
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    Re: Can't keep tight chain somtimes

    Rear axle nut torque spec: 93 N-m (9.5 kgf-m) (69 lbf-ft).

    Chain slack spec: 25-35mm (1.0 - 1.4 inch = 1 to 1 3/8's inch) Service limit 50mm (1.97 inches)

    As per the FSM for the 1997/98 XX.

    Sprocket wear will also be part of the chain slack issue. Check the sprockets for wear-n-tear prior to a new chain install or you may be throwing good money after bad on the new chain install.

    Tony
    Last edited by TigreST; 11-23-2008 at 4:03 PM.
    "Stemmata quid faciunt."

  10. #9

    Member #
    129
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    2001 Red CBR 1100xx
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    Re: Can't keep tight chain somtimes

    I put new sprockets on when I put the new chain on.
    68 foot lbs really isn't that much. I know I am giving it that much torque.

  11. #10

    Member #
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    '02 metalic cherry red CBR 1100 XX
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    Re: Can't keep tight chain somtimes

    Are you argueing?

  12. #11

    Member #
    1728
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    Re: Can't keep tight chain somtimes

    The design of the Blackbird chain adjustment system doesn't really allow for any movement of the rear axle if all is in working order. The Chain Adjustment Bolts thread into the extreme rear area of the alum. swingarm. These bolts carry the "Chain Adjusters" in a captured slip fit fashion on the shoulder bolt/snap ring assembly that is the Chain Adjuster Bolts. The shoulder of the adjuster bolts provide for tension application toward the rear of the bike which keeps a load on the axle.

    The adjuster bolts would need to be screw'd into the swing arm to begin to give slack to the axle and chain. Can the screws turn by themselves?...I don't know the answer to that one. If you suspect that they might I'd suggest a drop of Lock-Tite Blue #242 on the threads of the adjuster bolts to help hold them in check during your rides. (Lock Tite Blue will allow for normal bolt operation, DO NOT USE LOCK TITE RED!) In truth I don't think the bolts moving is in fact the issue here,..but I don't know what is the issue either.

    If all is new as you say (chain + sprockets) then you need to look at other things that might cause this. Cush drive rubbers worn maybe?

    It may be worth the effort to put the bike on the center stand, to give rear wheel rotation clearance, and then slowly rotate the rear wheel stopping at regular intervals and take note of the slack in the chain. A dial indicator type device might also allow you to take note of any run-out on the sprockets and cush drive system.

    I would say that what your seeing based on the info you've provided is not typical of the Blackbird. Hmmm....do you in fact have all the adjuster hardware on the swing arm as pictured in the attachment?


    Tony
    Attached Images
    "Stemmata quid faciunt."


 

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