f8GSA SPEED WOBBLES

Discussion in 'Parallel Universe' started by MazeWSP, Sep 1, 2014.

  1. MazeWSP

    MazeWSP Adventurer

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    heading back home on the highway last night running about 82mph. Got a serious case of the speed wobbles and almost went down. just put on tkc80's about a 2 weeks ago. they have been balanced. it was about to storm and the wind was whipping around. also fully loaded down with gear. never experienced anything like this before. what caused this? riding f800gsa 2014
    #1
  2. masco77

    masco77 n00b

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    Make sure your tires are mounted correctly. there are arrows on tire indicating correct direction for the tire to spin.
    #2
  3. FredRydr

    FredRydr Danger: Keep Back 500 Ft.

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    2014? It may be brand new, but have your wheels and steering head checked before hitting the road again, though it might just be your load resulted in your bike being too light over your front axle.

    Fred
    #3
  4. machinebuilder

    machinebuilder Long timer

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    :fpalm
    Here we go again
    :dhorse


    If this is the first time its happened and the first time you have been "Fully Loaded"

    CHECK YOUR REAR PRELOAD

    its in the owners manual

    this subject has been discussed at length many times. to find other threads use google search with

    Site:advrider.com F800 + F700 + F650 wobbles
    #4
  5. Loutre

    Loutre Cosmopolitan Adv

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    :huh

    is it just me or am I spreading? Reaver, I think we'll need to use protection from now on
    #5
  6. Reaver

    Reaver Outta Here

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    You can be imitated but not replaced. You're such a special blend the recipe is guarded like KFC's 11 herbs and spices. My swimmers have all drowned.

    We should have a poll on cracked tanks. I can't be the only one.
    How do I check my alternator? I hear some are bad?
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    I need service, what's the schedule and what oil should I use?
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    What panniers are the best?
    My tires are worn. Will I void the warranty if I put my own air in them?
    Are orange ones faster?
    I crossed a puddle and now my clutch is blown. Don't tell mom.

    My Fav:
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    Questions are good. Humour is good. Not bothering to research then bitch when no one replies.....:mad?

    To the OP, no offense. I'm just amusing myself again.
    #6
  7. FredRydr

    FredRydr Danger: Keep Back 500 Ft.

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    So...when I say go search, I get assholes who say don't be rude and answer instead. When I answer I get assholes who say go search.

    FYYFF

    Fred
    #7
  8. Reaver

    Reaver Outta Here

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    Yeah Fred, you can't win.

    You're outnumbered and outdummed.
    #8
  9. OldPete2112

    OldPete2112 Been here awhile

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    Wow, so you two are they guys that "know everything there is to know" about these bikes, and you get annoyed when new people come into this bike specific forum to ask questions about the specific bikes? You two are like Statler and Waldorf, the two old guys from the balcony in the muppet show.

    If it annoys you that much, stay out of the thread so perhaps others can answer or point people to some specific place in these giant threads where the answers can be found. There is a ton of information here, and likely I would have 50,000km on my new bike before I would have had time to sort through all of it.

    It's not like the guy asked which oil to use.


    All who wander are not lost.
    #9
  10. Reaver

    Reaver Outta Here

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    We just hashed it out extensively and that thread is barely on the second page.

    It's like Groundhog Day.

    If you're that sensitive then I would like to suggest you stay out of JM. Those guys are not nice.
    #10
  11. soyanarchisto

    soyanarchisto Long timer

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    But this isn't JM.
    #11
  12. machinebuilder

    machinebuilder Long timer

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    Hey if I came of like an ass..........so be it

    as Reaver pointed out the last thread only made it to the second page.


    I'll stop looking at the infinate number of threads that ask most of the questions on Reaver's list, even if there is sometimes some new, or interesting info.
    #12
  13. B_C_Ries

    B_C_Ries Long timer

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    I have TKC-80's and get wobbles from time to time, road surface seems to effect things as does wind and draft from semi's. I've found that moving forward on the bike and laying down on the tank makes the wobbles go away.
    Not sure if it is the change of wind resistance or the weight shift that matters.
    Wobbles were more of a problem for me when traveling fully loaded with panniers attached. Sometimes I wanted to pass trucks quickly and ended up doing 95-100 mph and got hit with wobbles, down on the tank I go and wobbles vanish.
    #13
  14. itsatdm

    itsatdm Long timer

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    You are new here, so "welcome". The bike has been in production 6 years now. Not much has changed.

    I guess some are getting tired of answering the same question over and over again. They are good resources, don't piss them off.

    There is a section called stickys that attempted to group some of the common problems so noobs could go search. I will give you 1 strike for not knowing that.

    Because the same questions have been asked so many times, the answers are all over the place. That's what happens when you do that. You can still search. Post your question in Google + ADV and you will likely find pertinent threads. That's strike 2.

    Ignoring this is strike 3. The bike is a little light in front. Increase preload on the rear or run your forks into the clamps or some combination of both. Check your steering head bearings for looseness. THC80's are knobby's with soft rubber. Mine wandered until they got quite a few miles on them or buy a more street orientated tire.
    #14
  15. WOLVERINE

    WOLVERINE Keep her pinned!

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    The problem is the F8GS/GSA don't like knobbie tires up front of any kind at speed over 120kph/70mph. Mine never liked Mitas E09 Dakars and I had a similar experience. It has nothing to do with your tire balancing or your steering head bearings, the bike is just too light in the front end ( for whatever reason ) and adding gear/weight to the rear end amplifies it tremendously. Steering dampener may help some but the cheaper solution is to watch your speed with knobbies or run a more street version like itsadm mentioned.
    Oh and don't mind some of the members, they forget they were new here once asking questions there were already answers too. Sometimes it's just quicker ask the question, get the answer, help the guy along his merry way then to post " you didn't look hard enough " mumbo jumbo. They forget they were new here once and did the same thing.
    #15
  16. itsatdm

    itsatdm Long timer

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    Not to beat this dead horse too much:dhorse I have owned my bike 6years this month. The first thing I did was put TKC 80 tires on it and rode to Death Valley. Besides the "weave" I got into a tank slapper at 60mph on the gravel road going to the Race track. It is scary.

    I was riding with 2 Ktm 950's, a DL650 and a 650 Yamaha thumper. I was the only with a problem.

    The idea that BMW takes a lightly sprung bike, makes it non adjustable and sells it to riders with wide range of weight, not to mention what they hang on it and expect it to be a one size fits all bike is ridiculous.

    Initially, raising the fork tubes did away with the weave. Then I resprung it and moved my body weight further forward when riding. Until the last tire change I have always used TKC tires and never experienced that again at any speed.

    When I see complaints about the bikes stability I wonder what the owner weighs and if he ever set it up with proper sag or even checked it. It can be a very stable bike.

    It is a tall bike with a high center of gravity. It needs to be set up for the rider.
    #16
  17. Rizzly

    Rizzly Adventurer

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    The number one item I buy for any of my bikes are steering stabilizers! In hindsight I wish I had installed one on the f800GS before my 2013, 8000 mile journey to Alaska…
    The GPR for the F800GS and a Scotts on the KTM 500 EXC…Both brands do the job effectively!
    #17
  18. MTrider16

    MTrider16 Ridin' in MT

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    Location:
    Eastern Montana
    Interesting responses.

    I've had mine since 2009 and exclusively ride TKC80's front and back. I also live in Montana and to get from A to B often drive above 80 mph on the asphalt. Before the Ohlins I could jack up the rear preload and induce a high speed wobble. Now I ride with the rear a little soft and stand if the bike is a "little wiggly" in deep gravel. However if what I read is correct, you can get a high speed wobble with the rear way soft and the front too high.

    Things to check:

    If new:
    tire balance
    forks not at the right level from the factory - there is a mark about 5 mm down from the top of the tube that should line up with the top of the triple clamp.
    suspension sag

    If you bought used:
    was the previous owner messing with the suspension and you need to set back to stock and start over.
    suspension sag
    suspension oil needs changed because it has turned into "whale snot".

    To the poeple who say all 21" front tires do that, I say baloney.
    You don't have to get a steering stabilizer, I drove up to deadhorse and back in 2010 with out one. I did decide to get one and have it on now, it can help with deep gravel some.

    For those of us who have been here discussing suspension since 2009, we have experimented and learned what it takes to make it work. Some of the old threads may save you from going down some dead ends.
    #18