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Old 03-17-2007, 11:39 AM   #1
life101 OP
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Question Help on R80g/s top tripple tree brace?

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!
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Old 03-17-2007, 12:11 PM   #2
lkchris
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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.
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Old 03-17-2007, 01:43 PM   #3
jtwind
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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
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Old 03-17-2007, 04:32 PM   #4
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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.
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Old 03-17-2007, 05:03 PM   #5
jtwind
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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
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Old 03-18-2007, 12:10 PM   #6
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Did it do the knocking before?

Quote:
Originally Posted by life101
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!
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
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Old 03-18-2007, 06:15 PM   #7
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Question

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.
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Old 03-18-2007, 06:46 PM   #8
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My knock was clearly attributed to steering bearing preload.
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Old 03-18-2007, 08:30 PM   #9
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Question

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!
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Old 03-20-2007, 08:30 PM   #10
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Try a spacer on top of the spring to add a little preload. Try about 15mm - 25mm dependant on your weight. This may help.
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Old 03-21-2007, 07:11 AM   #11
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Yes - that's really the last thing I can think of to try.

Thanks!
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Old 03-22-2007, 12:33 PM   #12
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Pissed Damnit!

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 ...
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Old 03-22-2007, 04:03 PM   #13
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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...

Quote:
Originally Posted by life101
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 ...
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Old 03-24-2007, 06:59 AM   #14
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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!
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Old 03-24-2007, 11:40 AM   #15
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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.
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