Chain - uneven tightness

Discussion in 'Motorbike Technical Discussion' started by YC, Oct 10, 2003.

  1. YC

    YC Guest

    Hi,

    I discovered the tightness of the chain for my bike is uneven (when I
    parked my bike using side stand (no full stand), sometime the chain is
    tight ie: no allowance, sometime the chain is loose - around 1 inch
    allowance). What could be the caused ?

    Brand: Suzuki
    Model: GZ125


    Thanks in advance,
    YC
     
    YC, Oct 10, 2003
    #1
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  2. Chains wear, and they don't wear evenly. All worn chains have some form
    of tight spot. Adjust at the tightest spot (ie: better too slack than
    too tight), and if the tight spot is severe (as it is on my Ducati at
    the moment, ahem), replace the chain.
     
    The Older Gentleman, Oct 10, 2003
    #2
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  3. YC

    Lee Guest

    Sprockets also wear unevenly, check the teeth for broken or worn ones.
     
    Lee, Oct 10, 2003
    #3
  4. True
     
    The Older Gentleman, Oct 10, 2003
    #4
  5. YC

    pragmatist Guest

    The tightness of your chain can depend on the degree of compression of
    your suspension - (read position of the bike).
    It's a 125. Boost it up on a milk crate and check it properly with the
    rear wheel off the ground.
    If the tension varies when you turn the free hanging rear wheel your
    chain may be stretched unevenly, but this is not too common.
    Also check for play in the swing arm bearings. That'll do it too but
    you'd probably spot it in the handling of the bike, (swerving on
    throttle changes).
    Best of luck _ Pragmatist - "R75/5 Forever!"
     
    pragmatist, Oct 10, 2003
    #5
  6. Chain tight spots will exist whether the bike is on the sidestand,
    centrestand, a milk crate, or hanging from a Chinook helicopter.

    What on earth are you on about?
     
    The Older Gentleman, Oct 10, 2003
    #6
  7. YC

    rhino Guest

    Uneven tightness can be caused by a sprocket not centered on the rear hub
    put the bike on the center stand and rotate the rear wheel till the chain is
    at its' tightest
    then loosen the nuts holding the sprocket a little and tap the
    sprocket/chain forward, then tighten the nuts.
    rotate the wheel and see if corrected the problem.
    Wore out chains and sprockets will also have this condition and will be
    worse if rotated on reverse direction.
     
    rhino, Oct 11, 2003
    #7
  8. YC

    James Clark Guest

    Since the swingarm pivot is not coincident with the
    countershaft, the angle of the swingarm will
    determine the distance between the sprockets.

    That's why the Buell XBs use that funky tensioner.
     
    James Clark, Oct 11, 2003
    #8
  9. Yes, and it's why the Hesketh had the output shaft concentric with the
    swinging arm pivot, but it doesn't alter the fact that if you have a
    tight spot, you'll have one no matter how you park or hold the bike.
     
    The Older Gentleman, Oct 11, 2003
    #9
  10. I have never, ever known this happen. Not saying it can't, mind, but the
    difference is will make is infinitesimal compared to the amount of
    "tightness" caused by a knackered chain - which is what the original
    poster has.
     
    The Older Gentleman, Oct 11, 2003
    #10
  11. YC

    James Clark Guest

    I tried an aluminum sprocket on the back of my GS1100EX.
    The sprocket had so much run out that I removed the teeth
    in a lathe, counter bored the mounting holes, and used the
    sprocket as a giant fender washer for a Zytel sprocket.
    Never wore out another chain after that, although the
    nylon sprocket did lose a couple of teeth by the time
    I disposed of the bike.
     
    James Clark, Oct 11, 2003
    #11
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