DRZ400 shock on the DR650

Discussion in 'Thumpers' started by NordieBoy, May 2, 2007.

  1. NordieBoy

    NordieBoy Armature speller

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    What exactly needs doing to a DRZ400 shock to get it to fit on the DR650?

    Drilling and tapping the 650 bottom fork thingy for the DRZ shaft.
    Drill (and tap?) for the rebound adjuster and grub screw.

    What spring to use?
    Stock DR650 is 6.5 kg/mm - Jesse says to use 7.6 kg/mm for my bodyweight/use.

    Stock DRZ400 is 5.5 kg/mm and RaceTech say to use a 5.7kg/mm for my bodyweight/use.

    Sounds like the DRZ spring is going to be way too soft.

    Help!
    #1
  2. bing

    bing F800GS & WR250R

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    I've fitted a DRZ400S shock to my DR650 (2003). I had to re-drill - thread the DR650 bottom mount to get it to fit. I had to wind a lot of preload on the shock (too much maybe) for my 75-80 kg weight. A heavier spring would definitely be good. Better shock though.
    #2
  3. NordieBoy

    NordieBoy Armature speller

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    How about the rebound adjuster?

    Hmmm.
    I'm 90kg without gear...
    #3
  4. NordieBoy

    NordieBoy Armature speller

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    Anyone re-spring the DRZ shock when they put it on the 650?
    #4
  5. ThePearl

    ThePearl Adventurer

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    I'm about to do this mod myself. I am going to put a heavier spring on the DRZ shock before I even attempt to mount it. I'll take the one I added to my DR650 shock. I forget what it was rated, but it was an improvement on the stocker but it still needs more help than I can do to it. So here comes the DRZ shock. Doesn't sound like too difficult a mod to get it to work.
    #5
  6. NordieBoy

    NordieBoy Armature speller

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    The DRZ spring has a much bigger diameter.
    Check those sizes carefully.
    #6
  7. lockpoker

    lockpoker Been here awhile

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    Gday nordieboy
    I have been thinking about doing this mod also and had the same thought,that the DRZ shock has the rebound adjuster on the bottom mount.Have you found out any more on how others have got around this ?

    Cheers Steve
    #7
  8. NordieBoy

    NordieBoy Armature speller

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    I sold my DRZ shock and upgraded the spring on the stocker.
    Cheaper and quicker.

    Not as good in the end but I needed the bike going NOW!
    #8
  9. gotdurt

    gotdurt Flatulent Fellow

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    So has anyone managed to find a heavier spring that will fit this shock? I keep hearing/reading that people are using the DRZ shock, but haven't found anyone who has actually been successful with a proper set-up...
    #9
  10. Big Willy

    Big Willy Gen. Italia

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    Bump...

    I've just fitted the DRZ shock also and was surprised by the amount of sag. Just searching the net now to find a suitable spring.
    The DRZ springs aren't available with a heavy load rating as far as I can see, posibly something to do with the leverage rate of the linkage I would think.
    There'll be something out there though
    #10
  11. ThumperDRZ

    ThumperDRZ Bouncing off Rocks!

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    www.racetech.com Any size you would need.

    #11
  12. LukasM

    LukasM Long timer

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    You might also want to check with inmate Zerodog. He got me custom rate springs for my forks for 20% less than I could find even stock rates ones anywhere else.

    Not sure if he has them for the DRZ shock but it's worth a try.

    Lukas
    #12
  13. Big Willy

    Big Willy Gen. Italia

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    Thanks mate. I've been checking out that site already and found....

    Standard DR spring is a 6.5kg/mm
    Standard DRZ spring is a 5.3kg/mm

    Racetech only go up to a 6.0kg/mm for the DRZ (which may do the trick), but I figure I need at least the 6.5 if that was what was on it originally.

    I do notice that there is a spring for the WR450 Yammy that is 3.5mm less on the inside diameter and only 3mm shorter. It is rated at 6.4kg/mm. It may well fit on the DRZ shock.

    Hmmm...wonder if the local suspension bloke is back from holidays yet.
    #13
  14. Big Willy

    Big Willy Gen. Italia

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    Thanks Lukas. Appreciated
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  15. Big Willy

    Big Willy Gen. Italia

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    Righto,

    The standard DRZ spring measures I.D. 66mm x I.D. 64mm x 267mm long.

    The WR spring isn't going to work. The inner diameter is TOO small.

    Now looking at the Eibach 895 series spring.

    It measures 64mm x 64mm x 254mm long...only 13mm shorter.

    It will entail machining 1mm off the adjuster sleeved castellated nut.

    It comes in at 7.1kg/mm.

    Now to see if it is available :D
    #15
  16. Big Willy

    Big Willy Gen. Italia

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    Ah, a lot of wasted effort.

    The local suspension bloke found a 7.2kg/mm spring for the DRZ shock. It is made by Promecha, a Dutch company apparently. Cost $180Aus (which is sorta normal for Oz).

    Thought about a revalve at the same time but decided to just go with the spring for now so as to compare.

    The tuner seems to think that the DRZ shock will be marginally better than what he could have done with the standard shock pointing out that it holds a slightly larger amount of oil.

    Either way it was going to cost $180 for a new spring whether for the DR or the DRZ shock so at least I'll be able to play with some clickers now. :clap
    #16
  17. TREE

    TREE Interloper

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    So it looks like there are not many choices for a stronger spring for the DRZ shock. :baldy
    One is from Promecha in Australia ( Melbourne ) at 7.1 kg/mm and the other may be an Eibach 889 although it is a bit weaker than the 6.5 on the stock DR650 shock.....

    Eibach 889 series at 6.3 kg/mm. # 889-0063.1

    The Eibach 895 series (7.1 kg/mm) is 13mm shorter but might work ?


    here is the Eibach download link: http://eibach.com/eibach/img/ems-catalog.pdf

    -------------------------------------------------


    Here is another way to machine down the lower link to 19mm thick so it will fit on the DRZ shock with the rubber seals still on the link:

    [​IMG]

    [​IMG]
    #17
  18. TREE

    TREE Interloper

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    The stiffer DRZ shock springs are not too hard to get.

    The best range in 265mm ( cheapest for 254 mm may be eshocks.com - see next post below ) is cannonracecraft.com ,
    they make springs up to 7.8 kg/mm x 265mm long for the DRZ shock at $120 each.

    Their pdf application chart was not easy to find on the webpage, buried at the bottom.
    ( I talked to them and the range goes up to 7.8 not 7.4 as shown on the pdf chart )

    Here is the url:

    http://tinyurl.com/dawzmd

    Here is some new info sent to me on choices........

    I bought the DRZ spring from factory connection-(factoryconnection.com) they sell them here on TT in the store. they have a 6.3 and 6.7 also. cannonracecraft.com have springs up to 7.4 and will custom make springs. the spring on the drz is the same as an RM suzuki or go to race tech they have springs too.


    http://www.factoryconnection.com/SpringCharts/2008/suzukiShock.htm
    #18
  19. itsatdm

    itsatdm Long timer

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    #19
  20. senoj

    senoj senoj 54 but now 55

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    I am running through the same mod on a 400 shock. I plan on machining a new bottom saddle that has the drz bottom adjuster screw and slide and still accept the DR650 linkage unmodified. I have worked out my specs and believe it should work!?

    Has anyone gone this way, if so please post some pics.:kboom
    #20