Strange shocker ID ?

Discussion in 'Airheads' started by Sibbo, Mar 26, 2012.

  1. Sibbo

    Sibbo Been here awhile

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    This shocker is on my 81 ST, still functioning if a little squashy but I'd like to be able to ID for when a rebuild is necessary ....... can any one help?


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    #1
  2. Sibbo

    Sibbo Been here awhile

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    Wow ! 99 views and no ID ! :cry
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  3. Solo Lobo

    Solo Lobo airhead or nothing

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    I was going to guess it was the optional "Sport Shock" from BMW but the adjuster looks wrong, and the instructions look to be in Italian!

    Well, that and your first picture is upside down, LOL

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    #3
  4. Sibbo

    Sibbo Been here awhile

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    Bugger ! That's what happens when I post late at night :lol2

    Total incompetence ! Edited and corrected ! I have no idea either and no one ever seems to be able to recognise it .If I could speak or write Italian I'd find an Italian BEEM forum and ask ........
    #4
  5. Solo Lobo

    Solo Lobo airhead or nothing

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    LOL!

    I say to try posting the question over on UKGSer's...
    #5
  6. ontic

    ontic

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    as one of the many lookers but not posters, I'd say, good idea that one:D

    I hope when the time comes that is rebuildable for you Peter.
    Have you played with the adjuster much- does it work well?
    #6
  7. Sibbo

    Sibbo Been here awhile

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    [​IMG]

    At the risk of revealing my total ignorance, what's the air /gas fill nipple for in this photo? Any idea Hans? If it's to pressurising with air ....how many psi ?
    #7
  8. ontic

    ontic

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    at the risk of revealing MY total ignorance:D, I'd say if it is a gas fill nipple it would be for nitrogen rather than 'air', and I have no idea of the pressure.
    A quick google for ohlins shock nitrogen pressure revealed anywhere from 140-200 or more PSI and a comment that higher the pressure, higher the wear on seals. Other branded and types of shock pressures seem to vary a bit in the google results.
    Then I guess you have to consider what oil to swap in... 5W maybe?

    You thinking of knocking on pandoras door?:lol3
    #8
  9. Sibbo

    Sibbo Been here awhile

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    NO ! I'm thinking of going to visit my local bike shop, the proprietor of which is BMW trained and generally helpful guy .:D

    I know how good a mechanic I am :cry and I'm really sure that learning on the ST would be more expensive than asking him !

    The fitting on that reservoir is the same as an inner tube so that's why I thought air .
    #9
  10. wirewrkr

    wirewrkr the thread-killer

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    Just a wild ass guess..........Bitubo? They are Italian.
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  11. H96669

    H96669 A proud pragmatist.

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    You know that if you want to be cheap you can refill them with air instead of Nitrogen.Does have some drawbacks as you may introduce moisture in the shock but many offroader will do that anyway without much problems.

    Comes in handy if it has a slow leak and you do not want to rebuild just yet. Look up Bicycle High Pressure Air Pumps, that's around $30.00 or so. And pressure...usually around 150-175 PSI altough that may vary a little.
    #11
  12. BeemerShop

    BeemerShop Ted Porter

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    I wouldn't recommend that. High pressure and low volume means a drastic pressure change when you remove the air chuck, you're not quick enough to set the pressure accurately. There's a also a big difference between air from a pump and Nitrogen.

    We use specialized equipment when we rebuild shocks. The nitrogen fill valve attaches and seals at the schrader valve, then another lever depresses the valve core. Then the nitrogen gas valve is turned on and nitrogen fills the reservoir until the desired pressure is reached (a pressure gauge is part of the filling device). Then before turning off the nitrogen, the lever is turned to close the valve core so that no pressure escapes, then the fill valve is unscrewed from the schrader valve.

    The other consideration is the location of the floating piston inside the reservoir. If the pressure inside the reservoir is low or non-existent, the oil may have pushed the piston higher than where it is supposed to be. The piston should be reset to the correct height, then the nitrogen is refilled (this is part of a shock rebuild). Otherwise you could have the piston slamming into the end of the reservoir creating a hydraulic lock prior to reaching full stroke on compression, not to mention you may have air in the shock which needs to be bled. I wouldn't recommend messing around with it unless you know what you're doing, you could make matters worse.

    I don't recognize the shock either. Frankly if it's Italian, I would be upgrading the shock to a newer unit that has good parts supply and plenty of people able to rebuild it.

    Ted Porter
    BeemerShop
    www.BeemerShop.com
    #12
  13. Solo Lobo

    Solo Lobo airhead or nothing

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  14. BeemerShop

    BeemerShop Ted Porter

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    Bitubo ugh! :eek1 I know of an importer that stopped selling them, too many problems.
    #14