990 Vibration

Discussion in 'Crazy-Awesome almost Dakar racers (950/990cc)' started by PRJKTM, Sep 22, 2008.

  1. 990S Pilot

    990S Pilot Is this round trip?

    Joined:
    Sep 12, 2008
    Oddometer:
    232
    Location:
    The wilds of central Texas
    Ah, got it. I got you confused with the OP.
    #21
  2. Killer Whale KTM

    Killer Whale KTM Life is the adventure!

    Joined:
    Oct 24, 2003
    Oddometer:
    722
    Location:
    The Mountains of Jasper GA
    Guys,
    Check your chain tension. I used to run mine way too tight. When I started to experiment , I noticed a big improvement when I "loosened" it a lot. Also it's better for the suspension and the bearings. Also check the tank bolts to see if they are too tight.
    hope this helps someone.
    Killer Whale KTM
    #22
  3. Racinace

    Racinace Been here awhile

    Joined:
    Sep 8, 2004
    Oddometer:
    459
    Location:
    La Center, Washington
    He stated that the vibration is there when stopped and just reving the motor. Vibration goes away when clutch is pulled in at speed.

    I agree with previous post... check main nut on clutch basket and related parts. MAKE THE DEALER CHECK IT OUT!!!!!!!!! It's a new bike and the 990's natoriously smooth.
    #23
  4. pilesofmiles

    pilesofmiles Life is an Adventure

    Joined:
    Jun 20, 2006
    Oddometer:
    738
    Location:
    Western NC
    Both bikes had the 600 mile service. I had a slight vibration from front tire on my bike. Dealer replaced the front tire (no cost) with a brand new Scorp/and found the front rim slightly out of round. New tire and a trued rim, all is well and smooth.

    Both bikes have been running great. no issues.
    #24
  5. Venteuri

    Venteuri I don't give a shit

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  6. TwoTiredRiders

    TwoTiredRiders Been here awhile

    Joined:
    Oct 9, 2008
    Oddometer:
    101
    Location:
    The Keystone State
    Old thread for sure, but I just got back from my first ride on the 2012 990R and searched this topic. I too am experiencing bad vibes between 4/5k rpms. My 950 did not do this. I'm trying to really work the allowable rev range and do a proper break in. The manual says up to 6k ok. Maybe 6,500 rpm but I only took it to 5 or so where it smoothed out nicely. Below 4k very smooth too. It may be just a break in thing. I read somewhere about a yamaha super tenere vibrating badly until it had some decent miles on it. I'd love to find another 990 to ride now.
    Not sure if I should just put the first 600 miles on or take it in now. Seems a little hasty, only 75 miles on it!
    Any 990 input?
    #26
  7. Zuber

    Zuber Zoob

    Joined:
    Sep 28, 2004
    Oddometer:
    2,209
    Location:
    Main Street, Shedd, Oregon
    This bike needs at least 3-5000 miles on it to start working right. They are really sweet after the first 'proper' valve adjust.

    These bikes are very sensitive to chain tension. The lowered (STD) models can get the chain tighter and will be smoother. The longer travel will just have to live with some vibes. When it gets even slightly loose, you'll get a vibe at 4200-5000 on the highway, more with a load, none without a load. It's only about a 1/3 turn on the adjusters to go from vibes to no vibes.

    Never over tighten. Have two friends sit on it and check the tension. It should not be bow string tight.
    #27
  8. TwoTiredRiders

    TwoTiredRiders Been here awhile

    Joined:
    Oct 9, 2008
    Oddometer:
    101
    Location:
    The Keystone State
    Thanks for the tip!
    I'll give it some more break in time, weather permitting. I'll check the load vs no load at the 4200 to 5k vibration zone, hadn't thought of that...pulling in the clutch or trying it downhill. I'll also check the chain tension.
    I remember one time getting my then new 888 back from the shop and having a horrible vibration at certain rpms. Eventually i stopped and checked over the bike to hear the ticking sound of a chain about ready to explode from heat. It was so freaking tight and so freaking hot i wouldn't dare ride it, so I walked to a house to borrow tools to loosen it.
    Apparently the tech at the shop didn't tighten either the axle bolt or the tensioner bolts and it tightened as I rode it.
    I check stuff out a little better now.
    #28