Rear Shock High Speed Compression Leaking 990

Discussion in 'Crazy-Awesome almost Dakar racers (950/990cc)' started by Desperate, Mar 10, 2018.

  1. Desperate

    Desperate Adventurer

    Joined:
    Dec 24, 2006
    Oddometer:
    71
    I screwed in the high speed compression nut clockwise as per manual and it started pissing out oil.

    I also noticed that you can screw the nut in more than what the socket can hold onto, it becomes recessed in the larger black nut.

    Can anyone explain this, I was meant to go away riding for 2 weeks tomorrow but now I will need to get it repaired or at least re gassed I expect.

    Thanks,
    #1
  2. geometrician

    geometrician let's keep going...

    Joined:
    May 25, 2008
    Oddometer:
    1,180
    Location:
    West-By-God Virginia
    Sounds like you have split an o-ring. Had to have rear shock on my (ex-) 250EXC rebuilt when a friend I loaned the bike to ran the adjustment nut OUT too far. Requires a vaccum bleed/purge and re-gassing.

    You can ride (if it isn't leaking) but you may well get some bouncing going as the nitrogen leaks out and the damping system begins to fail. Was not so much an issue with a 230lb dirtbike ridden in the woods (a long ride is 30 miles of singletrack), on a 500lb LC8, it may be another issue

    Sorry to bring bad news; on the plus side you can get your valving done while you are in there, and make sure to have (whomever) service the rebound screw on the bottom of the shock which becomes fouled from mud/water/corrosion. Here is a link to OEm replacement; Iam trying to find the link for the replacement setup which has more protection from the elements. The screws are tiny and have been know to break off causing more issues. One problem is the screws are set & left in ppace (or never touched at all).
    #2
  3. geometrician

    geometrician let's keep going...

    Joined:
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    Slavens sells the entire setup for recbound adjuster stock components, here.

    WP-Shock-Rebound-Adjuster-e1418180003372.jpg

    You can well imagine the PITA that occurs when this breaks in half...

    still trying to find the aftermarket upgrade, perhaps another inmate can come up with it before I do
    #3
  4. Rharr

    Rharr Been here awhile

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    Location:
    Tucson Az
    #4
  5. Torque

    Torque Been here awhile

    Joined:
    Apr 4, 2006
    Oddometer:
    282
    Location:
    San Diego
    Sorry bout your shock issue.
    You said high speed is leaking. That would be a 17mm adjuster at the top of the shock.
    What the others are showing is the rebound circuit at the bottom of the shock.
    The rebound will not leak oil but the high speed will leak oil.
    The thing that I do not understand is how the high speed keeps spinning? All I can think of is there are actually parts missing in the compression valve.
    I likely have any of the parts in stock but the dealer can get them pretty quick as well.
    Might as well release the nitrogen by loosening the allen at the bottom of your reservoir and pull the valve to look see.
    #5
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  6. geometrician

    geometrician let's keep going...

    Joined:
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    1,180
    Location:
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    ^^ Just pointing out as long as he is going for a (repair) followed by flush/fill/purge he might want to look into dealing with an often-overlooked WP Achilles Heel...

    I have been placing a "ball" of grease over the rebound adjusters for years on various bikes just to keep the elements from getting in and making things worse. The grease doesn't harm a thing and if it's thick enough protects the screw/passage/O-ring for many months of riding without issue
    #6
    Rharr likes this.