Help on R80g/s top tripple tree brace?

Discussion in 'Old's Cool' started by life101, Mar 17, 2007.

  1. life101

    life101 Adventurer

    Joined:
    Jan 15, 2004
    Oddometer:
    60
    Location:
    TX
    I've installed a San Jose (or Toaster Tan - I can't remember which) on my R80g/s, and everything's down snug and tight, but I get a pronounced knock when I hit even a small bump.

    What am I missing, please? I can't find it - help!
    #1
  2. lkchris

    lkchris Albuquerque

    Joined:
    Feb 23, 2005
    Oddometer:
    1,046
    Since the new clamp is thicker, the top nut doesn't doesn't screw into it the same amount unless you raise the stanchion.

    The new clamp would have to be the same thickness as the old one at the steering head for the dimensions at the fork legs to work out the same. It probably isn't.

    Because of all this, your springs aren't preloaded the same amount as they are with the OE clamp.
    #2
  3. jtwind

    jtwind Wisconsin Airhead

    Joined:
    Nov 19, 2004
    Oddometer:
    3,474
    Location:
    Madison WI
    If you tightened the clamp around the fork tubes before you torqued down the top center nut that may be your problem. The top nut needs to be pulled down snug before you tighten the clamps around the forks, other wise it may leave a space and allow that knock. Guess how I know this? JT
    #3
  4. life101

    life101 Adventurer

    Joined:
    Jan 15, 2004
    Oddometer:
    60
    Location:
    TX
    OK - so I've checked just about everything I can think of to find this clicking sound I get every time I hit even the smallest bump ...

    Loosened the pinch bolts on the TTT and loosened and retorqued the main nut which made no difference.

    Then I loosened the pinch bolts on the bottom TT and re-torqued the TTT again - no change.

    Maybe it is the springs chattering in the fork tubes - but I installed the longer Progressive springs, and can't imagine them having any play.

    Anything else I could be missing?

    Thanks for the advice!

    Joey.
    #4
  5. jtwind

    jtwind Wisconsin Airhead

    Joined:
    Nov 19, 2004
    Oddometer:
    3,474
    Location:
    Madison WI
    The only other thing I can think of is maybe you don't have the proper adjustment on the steering stem adjusting nut. If there is loosness there torqueing down the large steering stem locknut doesn't remove the play. When I had this problem on mine, I could reach down and feel the little bit of movement when I hit a bump. JT
    #5
  6. Mendodave

    Mendodave Road Scholar

    Joined:
    May 9, 2005
    Oddometer:
    952
    Location:
    North Coast California, M/C Heaven!
    My G/S has always done that. with stock spring and with progressives, with stock upper plate and with the Toaster Tan sweetheart of a triple tree.

    My dealer years and years ago said they all did it.

    But if it didn't do it previously....

    david
    #6
  7. life101

    life101 Adventurer

    Joined:
    Jan 15, 2004
    Oddometer:
    60
    Location:
    TX
    Thanks for all the advice, guys. I've installed a billet triple tree on both my R80ST and now on the R80G/S, and they both knock!

    On the G/S I've done all that was suggested here and more. Still have the knock.

    And no, it didn't knock before changing the TTT on either bike!

    One of those eternal (infernal) mysteries? Well, at least I know from this exercise that nothing's loose or unsafe - just a bit obnoxious!

    I appreciate the help,

    Joey in Dallas.
    #7
  8. StephenB

    StephenB G(/)S ... what else!

    Joined:
    Aug 24, 2005
    Oddometer:
    2,044
    Location:
    Ontario
    My knock was clearly attributed to steering bearing preload.
    #8
  9. life101

    life101 Adventurer

    Joined:
    Jan 15, 2004
    Oddometer:
    60
    Location:
    TX
    Hey Stephen - thanks for chiming in. I adjusted steering bearing preload twice today. It was originally a bit loose, and I adjusted it first a bit too tight, and then backed off a bit - both times the knock didn't change at all.

    BTW - it's a "click" I get when I hit a speedbump or minor bump in the road - the sound seems to come from the very top of the forks.

    Thanks all!
    #9
  10. ozadvntr

    ozadvntr Planning that trip, again

    Joined:
    Sep 15, 2002
    Oddometer:
    1,177
    Location:
    Queensland, Australia
    Try a spacer on top of the spring to add a little preload. Try about 15mm - 25mm dependant on your weight. This may help.
    #10
  11. life101

    life101 Adventurer

    Joined:
    Jan 15, 2004
    Oddometer:
    60
    Location:
    TX
    Yes - that's really the last thing I can think of to try.

    Thanks!
    #11
  12. life101

    life101 Adventurer

    Joined:
    Jan 15, 2004
    Oddometer:
    60
    Location:
    TX
    So I install spacers on top of the springs - adding about 3/8 inch there. Absolutely no play. Also went ahead and changed the oil to 10 wt. Had 7 wt. before.

    Go out for a test ride and I'm greeted with my same familiar click!

    And the gods chuckled to themselves ...
    #12
  13. OldTiredness

    OldTiredness Adventurer

    Joined:
    Jan 8, 2003
    Oddometer:
    35
    Location:
    Oakland
    Mine, 81 with progressive springs and spacers, has made that noise for the past 50k. Don't think there is much you can do - if you want to use the progressive springs...

    #13
  14. life101

    life101 Adventurer

    Joined:
    Jan 15, 2004
    Oddometer:
    60
    Location:
    TX
    Thanks Old tire - that's what I figured, but it's nice to know I'm not the only one to have it happen.

    Oh well - it was a good exercise - I know the front end is as bulletproof as it's gonna get for the time being!
    #14
  15. Tim McKittrick

    Tim McKittrick Long timer

    Joined:
    Dec 29, 2003
    Oddometer:
    1,785
    Location:
    Wasilla Alaska
    My R100RT does the same thing- an so did my R100RS- a pronounced "clack" when rolling over small abrupt bumps. I have checked steering head bearings, spring height etc., etc, and can't get the click to go away. On the RS I slid some small lengths of plastic tubing over the springs to keep them from hitting the inside of the fork tube, and that helped some. I'd love to know of a definite fix as it irritates me to no end.
    #15
  16. life101

    life101 Adventurer

    Joined:
    Jan 15, 2004
    Oddometer:
    60
    Location:
    TX
    Cool. I hadn't thought about lateral movement, but that's certainly a possibility - the progressive springs have plenty of room ...
    #16
  17. Mendodave

    Mendodave Road Scholar

    Joined:
    May 9, 2005
    Oddometer:
    952
    Location:
    North Coast California, M/C Heaven!
    ditto, kiddo.

    it has bothered me for thousands of miles. i pretty much tuned it out, but now that i have the g/s back i really notice it. this has happened on at least 4 different g/s bikes, and it happened box stock too...so this isn't related to progressive or toaster tan. you were just lucky, i guess, if it didn't occur previously. my two g/s's have always done it, my old girlfriends two g/s's did it, several mechs said it was normal, but this was all 20 years ago when i last had this bike. i would hope for improvement, and if yours didn't do it, then there is a solution.

    let's find it!

    david
    #17