BMW K bikes (Bricks)

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1Back to top Go down   perpetual problem Empty perpetual problem Fri Jun 21, 2013 1:21 pm

JGT

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Having not used the LT for a month, decided as its the longest day, give it a treat and go to work on it. Zooms up to ninety sweet as a nut. OH NO IT DOES'NT! Those blasted vibrating handlebars really spoil the experience. Now I have read of larger bar end weight, removing them, fill the bars with various substances etc. but all seem to have no effect. Now my particular machine seems smooth in all other areas, so my question is, has anyone tried doing away with the rubber mountings for the handle bars and rigidly mounted them? John

    

2Back to top Go down   perpetual problem Empty There are posts to that subject Fri Jun 21, 2013 1:33 pm

ibjman

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Yes. There are posts elsewhere in the forum suggesting that an upper triple tree bracket from a K75 can be substituted as it apparently has no rubber isolators for the bars. The K75 is inherently smoother that the 100.
I would guess that removing the rubber isolators might make the vibes more pronounced, not less, but I would have thought the same about the early footpeg brackets but BMW seems to have proven me wrong, by mounting the newer footpeg brackets solid as you suggest with the bars.
Personally I have not tried filling the bars with lead pellets nor have I any bar end weights.
I have been riding 85 K100's (reported to be more vibration than newer ones) for years and I guess I've learned to live with the Buzz by just varying to a different speed where the harmonics differ.
I use foam rubber grips and gel pads in the palms of my gloves. I find it tolerable but I do still have buzzy hands after I get off.
Regards, Ibj...

    

3Back to top Go down   perpetual problem Empty Re: perpetual problem Fri Jun 21, 2013 2:24 pm

nino

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Hi, month and half ago I mounted hard upper triple clamp on my old k 100 in rt trim. So far, everything is better, no vibes, better, more direct response in curves and no fear of bolts in rubber mounts break. So full reccomendations on that change. But before tune engine properly, adjust steering head bearing, etc.
Best regards

    

4Back to top Go down   perpetual problem Empty makes sense Fri Jun 21, 2013 2:46 pm

ibjman

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That makes perfect sense, I just don't understand why....LOL

    

5Back to top Go down   perpetual problem Empty Re: perpetual problem Fri Jun 21, 2013 3:07 pm

MikeP

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Yes. There are posts elsewhere in the forum suggesting that an upper triple tree bracket from a K75 can be substituted as it apparently has no rubber isolators for the bars. The K75 is inherently smoother that the 100.

Both statements are correct. This is a K75 top yoke with solid handlebar mountings:

perpetual problem BMW%20K75S%20%2885%29-L

    

6Back to top Go down   perpetual problem Empty No argument here Fri Jun 21, 2013 3:19 pm

ibjman

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I agree - completely.

Sometimes I wonder why the solid mount has less vibes

    

7Back to top Go down   perpetual problem Empty Re: perpetual problem Fri Jun 21, 2013 5:20 pm

JGT

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OK. The quick and easy option for me is to replace the rubber insert with something made from steel or aluminium ( I have a lathe). Are the inserts two top hat shapes pressed in from top and bottom or is it a one piece part? John

    

8Back to top Go down   perpetual problem Empty Don't know but.... Fri Jun 21, 2013 5:27 pm

ibjman

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You can make the inserts, but that will not prevent the other failure reported as the through bolts breaking off.

    

9Back to top Go down   perpetual problem Empty Perpetual problem Fri Jun 21, 2013 5:34 pm

otto59

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I haven't tried it myself, but I read somewhere that if you remove the bar end weights altogether it reduces the vibration. I just buy the foam grips. Only last 2-3 years but only $5 a pair.

    

10Back to top Go down   perpetual problem Empty change the rubbers Fri Jun 21, 2013 6:20 pm

colinijohnson

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I renewed the mount rubbers last month and vibrartion vanished. I read somewhere that after 24 years the originals loose effectiveness.
I read somewhere too that its worthwhile renewing the alternator bushes too, as these create noise after time - has anyone experienced this?

    

11Back to top Go down   perpetual problem Empty Re: perpetual problem Fri Jun 21, 2013 6:26 pm

MikeP

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The alternator cush-drive rubbers will harden over time. Oddly, they don't seem prone to breaking up on the four cylinder bikes in quite the same way as they do on the triples.

    

12Back to top Go down   perpetual problem Empty That's Fri Jun 21, 2013 8:58 pm

ibjman

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That's a great idea Otto & makes a LOT of sense

    

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