HP2 Enduro clutch/gearbox noise

Discussion in 'GS Boxers' started by surfted, Apr 6, 2009.

  1. surfted

    surfted Adventurer

    Joined:
    Dec 5, 2008
    Oddometer:
    54
    Location:
    Sweden
    Hello mates

    I have been reading about this typical noise in different forums and alot of them in threads from this forum. But there is not som many threads about the hp2 enduro gearbox noise in neutral.



    The summary of what I been reading are:

    * Not greased or worn splines between clutch and gearbox inputshaft

    * Because of a not regular rpm at idle(lean mixture and surging) makes the gearbox to rattle

    * Worn bearing in the back of the inputshaft(not sure if this affects the 1200gs and not sure if it has anything to do with the rattle)




    I know that a lot of people have this sound but should it be there? Is it normal? I changed gearbox oil yesterday and it was grey/brown and frankly I don't know the last time it was changed. My bike have 18500km on it and the first 10000km service I sent it in but I don't trust the shop. So it could be more than 10000km. But there was no sign of metalldebris in it so I guess it's ok.

    Then I got to think that I maybe should have a look inside the gearbox to ensure that everything is ok. Better safe than sorry since it's expensive stuff. I took a look at the cd-manual that we HP2 owner get with the bike.



    And found this section in "replacing input shaft" under gearbox category:

    "Attention
    Incorrect assembly can result in excessive or insufficient predamper travel.
    This will cause the gearbox to rattle in neutral or will produce excessive
    reactions to load changes. If the gearbox input shaft is partially or
    completely disassambled, it is essential to recheck predamper travel before
    reinstalling the shaft in the gearbox."




    So this got me to think could it be that some gearboxes are faulty from factory? What I can remember so I had this sound since day one and 1000km.

    The rattle dissapears when you pull the clutchlever and I guess that locates the problem tp gearbox or the or the part of the clutch that spinns with it.

    Is there someone who has experience from overhauling these gearboxes that can tell me how this predamper thing works and what it is?



    What do you think?
    #1
  2. Warthog

    Warthog TeutonicChronic

    Joined:
    Jun 24, 2006
    Oddometer:
    845
    Location:
    The ROK
    :ear

    I'm all ears on this issue...

    I hear the HP2 gearbox has a stronger something or other installed...and the drive shaft is reinforced.
    #2
  3. funhouse

    funhouse Overdue

    Joined:
    May 6, 2007
    Oddometer:
    3,044
    Location:
    Santa Barbara
    Mine will rattle like two cats f%#@ing on a tin roof if I'm lugging around town in too tall a gear....the lightly loaded gear cluster rattles and bangs embarrassingly -- gotta remember that 1200cc still doesn't mean I can ride in any gear -- or ride my scooter more around town......Bruce
    #3
  4. Some Dude

    Some Dude what attitude problem???

    Joined:
    Dec 2, 2003
    Oddometer:
    4,770
    Location:
    Woodstock, GA
    unfortunately the tolerances within the gearboxes has been spotty at best in our experiences. While we've only had to take out 3 or 4 HP2E transmissions, all of them had issues that in our opinion may have been related to initial set-up at the factory as the gears and bearings were not properly shimmed. You'll need a good BMW tech with gearbox certification and the necessary tools to measure and diagnose.
    #4
  5. surfted

    surfted Adventurer

    Joined:
    Dec 5, 2008
    Oddometer:
    54
    Location:
    Sweden
    BMW Atlanta

    What happend to these gearboxes? How did the riders know that something were wrong?

    How does a properly shimmed gearbox sound? Theres almost no ratteling when the oil is cold but as soon as it's varm the ratteling starts. My hp2 sound a little more than my buddys bike when hot.

    Is there any hp2e gearbox that is completely silent?

    I mean how do we actually know what's perfectly normal and what's not.:dunno

    I've been sorting out different sound/noises one by one since I bougth a BMW. And I figured out that most of the time nothings wrong. it's just the way they are. :D
    #5
  6. mnmlst

    mnmlst mnmlst

    Joined:
    Nov 3, 2005
    Oddometer:
    105
    Mine started rattling around 6000mi, now it sounds like a 55gal drum full of bowling balls bouncing down a set of concrete steps... at first only when the clutch was in (any speed), but lately I'm sensing vibration when I get off the gas in gear.

    Something ain't right. It's going to the shop.
    #6
  7. JohnTz

    JohnTz HP2 Rider

    Joined:
    Sep 24, 2007
    Oddometer:
    156
    Location:
    Chicago Area
    Has anyone got any more info on this? My bike does the same thing. Rattles in nuetral with the clutch out but when you pull the clutch in it gets quiet. No problems, shifts great, just makes the rattling noise so far.
    #7
  8. maverick

    maverick Lost South-African..

    Joined:
    Feb 18, 2002
    Oddometer:
    562
    Location:
    Prince Albert, South-Africa
    I am now really worried as all of your bikes rattle and mine don't, is there something wrong with mine perhaps :huh :D
    #8
  9. funhouse

    funhouse Overdue

    Joined:
    May 6, 2007
    Oddometer:
    3,044
    Location:
    Santa Barbara
    Maverick: I'm taking my pile into the dealer tomorrow for rear main and rear transmission seal and fork rebuild......had to take it apart to clean all the road crap off everything after the trip....and can't think of a thing the trans needs, even though it's going to be on the bench anyway.....bruce

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    #9
  10. SaintEx

    SaintEx n00b

    Joined:
    Feb 14, 2010
    Oddometer:
    5
    Location:
    Australia
    I have a late 2008 model R1200GS (owned by me since new), and at 120,000kms it developed a rattle in the clutch/gearbox area. On investigation it turned out to be caused by multiple cracks in the cush drive assembly (BMW calls this component the predamper, in its manual) on the input drive shaft in the gearbox. An expensive but necessary repair followed. This is not the first failure of this component that my repairer has seen. Has anyone else had a similar problem?
    #10
  11. oldfool

    oldfool Been here awhile

    Joined:
    Jun 17, 2006
    Oddometer:
    769
    Location:
    San Pedro, california
    Mine makes some noise not enough to concern me yet. I change all fluids forks,trans, rear end every other year I never believed in lifetime oil in these components. I know some people think that's a waste. I paid alot of money for this toy and I have no problem with preventative maintenance over and above factory recommendations. I find myself in places I don't want to be stuck in. This is still my favorite toy I have at the moment. Richard Have fun.
    #11