2007 KTM 990 S Lc8 Engine Mods

Discussion in 'Crazy-Awesome almost Dakar racers (950/990cc)' started by BikeBandit, Apr 4, 2008.

  1. DELTATANGO

    DELTATANGO Motorcyclist and Dog Walk

    Joined:
    Nov 27, 2005
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    14,275
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    Alabama
    crunk
    #81
  2. cjracer

    cjracer AWD please!!

    Joined:
    Sep 26, 2005
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    3,992
    Location:
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    Do you have a source for Good head gaskets.... ?
    #82
  3. StevenD

    StevenD Hmmmm, dirt!

    Joined:
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    I'm planning to use a copper crushring and silicone, thats what my dragrace shop uses reliably.
    Rc8r plant with 1190 gears sounds promising too though.. whichever I find first I guess..
    #83
  4. wilmar13

    wilmar13 Long timer

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    #84
  5. cjracer

    cjracer AWD please!!

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    I'm looking for something that is more long term. Copper works great in a drag bike, not sure I'd trust it for 100,000 mile engine build, never seen a copper set last that long. My hold up is the cost to have a die made to make nice MLS OEM quality gaskets that I would prefer.
    #85
  6. StevenD

    StevenD Hmmmm, dirt!

    Joined:
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    Yeah, i have no personal experience with copper. This company tells its reliable but I doubt they have 100.000mile experience. How long have you seen them last? I'd he happy with les than half that. It's funny how a gasket shows to be more difficult than a piston!

    Do you have experience regrinding cams? I think this motor could possibly bennefit even more with cams than 105mil pistons. I find no local company that does this here in holland.
    #86
  7. pdxmotorhead

    pdxmotorhead Long timer

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    Cometic will make them to order for most engines,, all they need is 1 original.. But you'll pay $$..

    Back when I worked on the occasional hard metal head gasket you did not use silicone, the standard coating was Coppercoat gasket sealer.. Still available, its what I use anywhere I absolutely want the gasket to stick. Its a pain in the rear to remove without using a chemical remover, and we often had to use brass wedges to pop the head off an old tractor when it had been glued on copper coat + a copper gasket.. Don't know about miles but some of those tractors ran many many years all season long. You also need to re-torque metal gaskets after they have been warmed up a time or two..

    Cheers
    Dave
    #87
  8. stevh0

    stevh0 Super Retard.

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    What happened to this bike?
    #88
  9. pauloston

    pauloston Adventurer

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    May 7, 2009
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    40
    Apologies for the tardy response, I've been on another planet ;)
    EFI is complete and last Dyno saw 141.6 RWHP, that's 50% up from STD, pretty cool! ktm erzberg side final.jpeg
    #89
    KTM/KEG, macleod, oldfuddy and 5 others like this.
  10. hegis

    hegis Adventurer

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    Mar 23, 2016
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    finland
    Hi! I bought a 2008 990 superduke engine and i'm going to take its pistons, cylinders and cams to my 2005 950 adventure. Does anybody know are these parts matching straight?
    #90