Ugly fork seals. - - Excellence in Motion
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post #1 of 4 (permalink) Old Apr 16th, 2012, 1:33 pm Thread Starter
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Join Date: Jun 2009
Location: Burton, British Columbia, Canada
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Ugly fork seals.

Catch them before they leak.

Or....before the corrosion grits find their way down the tubes.

Nice for us riding all weather, looks like moisture got passed the outer seals (caps) and corroded the metal part of the inner seals.

Same is happening with the outer seals (cups), they also do have a metal ring in them. Fixed for now but I will be getting new ones....!

Benelli 50cc at 14
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BMW K100RS at 27
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post #2 of 4 (permalink) Old May 4th, 2012, 4:27 pm
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Glad I have been running gaytors on mine for 6 years after I did the fork seals (first job!). Never been back since.

I often source my seals non-oem and I have had to learn a few things. Standard seals can come off the shelf from my bearing and seal supplier according to the BMW metric sizes. But there are 'variants' on most seals. Whether you have an additional dust lip or not is a variant. There are also some seals that can be got with two lips and springs. The lip profiles can vary too. At the end of the day I end up with the nearest match I can get and best if possible. The funny thing about buying seals, is the difference between a generic and a 'Rolls Royce' seal in say Viton or Teflon with multiple lips may only be a 10-20% price difference. Peanuts compared to labor, but loads of profit lost if you are BMW churning out bikes.

Gaytors are like an extra seal covering the top of the fork slider so no bugs and grit get inside. You hardly notice them being hidden behind the plastics. I would recommend fitting gaytors to anybody doing a fork seal repair.

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post #3 of 4 (permalink) Old Oct 12th, 2012, 12:36 pm
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Any guidance for replacing the fork seals on my K100 RS 1990?
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post #4 of 4 (permalink) Old Oct 13th, 2012, 5:07 am
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Originally Posted by pipeandslippers
Any guidance for replacing the fork seals on my K100 RS 1990?
Here do you find a link......if yours is a 2V...4V`s got a different fork.
In general most would be similar.....4V`s got a circlip above the seal and bronze bushings.

What could be added is, be careful to keep the key straight when undoing the allen bolts at the bottom of the slider.
These have a narrow head, which is easily rounded.

It also is a special allen key available for these allen bolts with a narrow head, which don`t slipps that easy.

Inge K.
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