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Thread: Strange shock behaviour

  1. #1
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    4th October 2009 - 09:24
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    Strange shock behaviour

    I replaced my shock a couple of years ago and had the new one sprung correctly for my (then) weight.
    I lost some weight on purpose and then got quite crook and lost a whole lot more.
    I'm currently about 18-20 kg under the weight that the shock is sprung for.
    So as I expect when I hit big bumps I nearly get thrown off the bike.
    But the strange thing is now my number plate which is on a home made tail tidy is being hit by the back wheel at some point when riding and is getting folded up under the bike
    How does this happen? I'm lighter so the shock shouldn't be able to compress as much - surely? This never happened when i was fatter.
    Theres no fluid leaks or anything, the shock seems fine otherwise.
    Whats going on?

  2. #2
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    17th July 2003 - 23:37
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    Perhaps your home made tail tidy has folded down a little from the bouncier ride?


    Stupid phone / Tapatalk, apologies in advance.

  3. #3
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    Also the bounce rate should be being restricted by your shock. Is it?


    Stupid phone / Tapatalk, apologies in advance.

  4. #4
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    Maybe it's nothing to do with the shock.... chain stretch/adjustment, wheel is now further back in the swing-arm and what was once adequate clearance is now gone

  5. #5
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    Maybe the shock being outside its normal operating range is causng the linkage to behave strangely? Speak to whoever you got the shock off?
    Let's know what the answer is when you find out.
    There is a grey blur, and a green blur. I try to stay on the grey one. - Joey Dunlop

  6. #6
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    GAS pressure in shock is gone, causing it to blow through its stroke MOST LIKELY. What brand of shock and was it new or used when you fitted it?
    shaun@motodynamix.co.nz


    I love my job Call 0223210319--AKA Shaun

  7. #7
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    Maybe because you are not so fat you are going faster .....

  8. #8
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    Quote Originally Posted by Moto-Dynamix View Post
    GAS pressure in shock is gone, causing it to blow through its stroke MOST LIKELY. What brand of shock and was it new or used when you fitted it?
    Yss. New on bike 3 yrs ago .Serviced about a year ago. How would I check the gas pressure?

  9. #9
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    Quote Originally Posted by Big Dog View Post
    Also the bounce rate should be being restricted by your shock. Is it?


    Stupid phone / Tapatalk, apologies in advance.
    Dunno, tell me more about this

  10. #10
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    Quote Originally Posted by Bassmatt View Post
    Yss. New on bike 3 yrs ago .Serviced about a year ago. How would I check the gas pressure?


    It needs to be taken to some one up there that has the correct tools to check it over. Norm Cobb in elersley possibly. Yss are an ok commutor shock, but not to good in the build quality dept though, so from what you have said, I am Confident it has lost it's gas pressure.
    shaun@motodynamix.co.nz


    I love my job Call 0223210319--AKA Shaun

  11. #11
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    Quote Originally Posted by Big Dog View Post
    Also the bounce rate should be being restricted by your shock. Is it?


    Stupid phone / Tapatalk, apologies in advance.


    what do you mean by that mate?
    shaun@motodynamix.co.nz


    I love my job Call 0223210319--AKA Shaun

  12. #12
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    how far does it go down when you sit on it?

    I think Shaun is correct (fuck that hurt).

  13. #13
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    Quote Originally Posted by Moto-Dynamix View Post
    . Yss are an ok commutor shock, but not to good in the build quality dept though, so from what you have said, I am Confident it has lost it's gas pressure.
    Build quality is shit alright, it started leaking oil pretty much right after I bought it and it was "serviced" last year because it shat itself and dumped all its oil. Theres a yss authorized dude near me who serviced it last time he said they used crap seals and reckons he put better ones in for me , I guess ill have a chat to him.
    Please tell me regassing it is cheap.

  14. #14
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    Quote Originally Posted by Moto-Dynamix View Post
    what do you mean by that mate?
    That the shock absorber does the shock absorbing.
    The spring does the springing.
    That it sounds to me like the shock is not taking the shock out of the stroke, causing the pogoing he refers to.

    The why of it is difficult to diagnose for a an amateur like me without seeing oil running out somewhere or the like.
    Your gas idea sounds like a better track than that the spring was sprung for someone heavier by only 20 kgs.



    Stupid phone / Tapatalk, apologies in advance.

  15. #15
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    Quote Originally Posted by Bassmatt View Post
    I replaced my shock a couple of years ago and had the new one sprung correctly for my (then) weight.
    I lost some weight on purpose and then got quite crook and lost a whole lot more.
    I'm currently about 18-20 kg under the weight that the shock is sprung for.
    So as I expect when I hit big bumps I nearly get thrown off the bike.
    But the strange thing is now my number plate which is on a home made tail tidy is being hit by the back wheel at some point when riding and is getting folded up under the bike
    How does this happen? I'm lighter so the shock shouldn't be able to compress as much - surely? This never happened when i was fatter.
    Theres no fluid leaks or anything, the shock seems fine otherwise.
    Whats going on?
    The missus has put on 40 kg?
    Political Correctness, the chief weapon of whiney arse bastards

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