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"KRS/GT" Technical Q&A K1200RS/GT Technical Questions/Answers

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Old 07-24-2013, 12:38 AM
gsf12s gsf12s is offline
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Front Fork Type

I got K1200RS early model recently.
My bike has oil leak on front fork.
So I will place the order for fork seal to Motorworks.
Could someome tell me how to know which fork, Showa or Marzocchi,
does my bike has?
First registration year is 1999、but It doesn`t match the year of it is built.
So I don`t know the production year.
My frame number is WB10544J7WZA26---
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Old 07-24-2013, 01:20 AM
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Beech Beech is online now
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Re: Front Fork Type

9/98 was the production end of the Marzocchi. If you look at the build decals on your bike you should find the date.

5 31 42 2 333 409 SET: REPAIR KIT SEAL RINGS - MARZOCCHI (to 09/98)0.07 2 $34.72
This repair kit applies to Marzocchi fork sliders that were only used one year prior to the Showa sliders.

Here is data from the next edition of the fork. All this data was found in the Max BMW parts fiche system by looking at the 98-01 and the 02 and on RS

31 42 2 311 988 SHAFT SEAL0.04 2 $15.68
Recommended when doing a fork rebuild. NOTE: In the case of a K12RS (09/1998 and older), these seals DO NOT fit Marzocchi fork sliders. Please use the 409 kit for PRE 09/1998 models.

Here is a link to the basic site, you can order from them to get BMW parts:


Welcome to the site. Don't be afraid to use BMW parts when affordable and there is a question of usability.
Beech Arriba, Abajo, Al Centro, Adentro
Mount Vernon Cannon Works
I need a Honda sport or better yet a Monkey
I change your tires, you buy them on the web, I do the work $40, trying to keep riders on the road.
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Old 07-24-2013, 04:16 AM
gsf12s gsf12s is offline
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Re: Front Fork Type

Thanks Beech,
I will search the build decal on my bike.
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Old 07-24-2013, 06:00 AM
voxmagna voxmagna is offline
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Re: Front Fork Type

I did my '97 seals a long time ago and I remember reading several posts critical of the oem replacements. In the end I took their seal size off the seal and fiche and got mine from a seal supplier. These type of seal specs come without (most common) and with a top dust seal. The oem has the top dust lip seal. Since I put on a pair of fork gaytors, I wasn't too bothered if the top dust lip was there or not and I've had no fork leaks in over 5 years. Checking for 'dings' on the chrome sliders and stopping bugs and dust is the way for reliable fork seals.

Here is the text of a very old post I pulled from my archive, don't know if it will help. Vesrah also do them. If not, do as Beech says and get the stealer parts as they may have woken up to past criticism by now:

I have a '97 K12RS and after three attempts forking out big $ for BMW OEM fork seals, I gave up and installed LeakProof seals (Motovan part #s 155-128 Fork Seal Kit, 36x57x10mm and 157-139 Dust Seal Only Kit, for KTM SX G5 02-07; ref. Goallballs.com) @ $30 total. That was two years ago and the fork tubes have been bone dry ever since. This was an old trick I'd used on a Can-Am enduro bike back in the '80's. Still works
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Old 07-24-2013, 09:12 AM
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Re: Front Fork Type

You can find VIN decoders on the web that will tell you production date from the last 7 characters of your VIN, such as http://www.bmwarchiv.de/vin/. You don't provide all of yours, but I checked ZA26000 and ZA26999. That puts yours somewhere in August, September, or October of 1997. Therefore, you should have Marzocchi forks.
Eric R.

'03 K12RS
'94 R11RS - sold
'86 urq
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Old 07-24-2013, 12:53 PM
gsf12s gsf12s is offline
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Re: Front Fork Type

Racingiron, thanks for the information.
I found that my bike was built on Sep 1997.
Thanks a lot.
And also thanks you all for giving the information.
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Old 07-24-2013, 01:07 PM
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Re: Front Fork Type

Also when you contact the dealer where you'll be buying the parts, giving the dealer you VIN should help assure that you get the correct parts. Changing the fork seals is pretty easy - good luck with it.
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Old 10-03-2018, 09:35 AM
clone5 clone5 is offline
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Re: Front Fork Type

Just to confirm the fork seal sizes between the Showa and Marzocchi

Is this correct?

Early model (pre 9/98)

Everything else
Too many bikes currently in the stable
Kawasaki ZR750C1 Zephyr 1991
Yamaha YZF-R1 2001
BMW K1200RS 1997
Vespa VNB 1961
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