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Rear shock service?

Discussion in 'Maintenance and Servicing' started by dobbo, May 2, 2014.

  1. Hi,

    I have stripped the rear shock down and release the nitrogen pressure and drained the old oil; however,
    I have been unable to locate 'Shock Oil' locally.

    Does anyone here service their own shocks?

    Does it matter if I use fork oil instead?

    Also any ideas where to find someone that could pressurise my shock with Nitrogen? (as I need 142psi, which is fairly high for many businesses)
  2. rear shocks are not normally something people service at home. Most are sealed and are meant to be disposable.

    That being said there are a few people in Aus who specialise in rebuilding them.

    shock oil and fork oil will be the same but you will need to know the weight. I would guess pretty light, but the interwebs is you friend here.

    as for the nitrogen, a number of workshops use nitrogen, for various reasons, so it's a matter of phoning around to find someone to help you.

    The other way to go is to just take it to a rebuilder and get him to finish it off. The advantage being he may be able to tweak the performance for you.

    [hang on . . . ] is that 142psi? Is this a fournales?
  3. You can gas the shock yourself. The special tools for re-gassing can be purchased from Terry Hay's 'Shock Treatment'. Then all you need is a nitrogen gas cylinder. All this can be a bit expensive for a one off job, but if you plan on servicing the shock regularly, such as with a MX bike, then it can be cheaper in the long run than paying a shop to do it.
    Some oils are sold as 'Fork & Shock oil'. I think Yamaha branded oil is one example. Yes fork oil will work ok, but specific shock oil is formulated slightly different. From memory Shock oil had a additive which made it even more resistant to foaming than fork oil. But 142 PSI of gas pressure alone will limit foaming, and is the usual amount of pressure, give or take a few PSi, which is used in most dirt bike rear shocks.
  4. Thanks for the quick replies.

    Found the yamalube fork & shock oil 10W.
    Will checkout suspensionsRus for a spring upgrade.

    Regarding spannering on my bikes..... l cannot remember last time someone else worked on any off them. I learn as l go, and haven't found anything that l will not tackle..... maybe electronics/ electrics would pull me up.
  5. I learnt something today.

    As for working on a bike myself, I will do anything on a bike, including electronics, but unless the rear shock was made to be rebuilt, I wouldn't touch one.

    Having noted that, it does seem your shock is made to rebuild. So I'd probably give it a go, so long as I was confident I could re-gas it afterwards.
  6. 10wt might be a bit heavy, unless that is what is recommended for your model. Most tend to recommend 5wt. Good to see someone willing to give it a go. Rear shocks scare most people, but they really are not that hard to do if you have all the tools. Just a little tricky & messy to assemble without trapping any air bubbles.
  7. :wacky: I have now got a heavier rear shock spring and have ordered a 'gold valve/shim kit' from the USA.
    So a rebuild is coming.

    More to follow..........