Results 1 to 15 of 15

Thread: 1994 R100RT fork spring replace

  1. #1
    Registered User
    Join Date
    Oct 2017
    Location
    Wesley Chapel, FL.
    Posts
    13

    1994 R100RT fork spring replace

    I want to remove and replace the stock fork springs. I discovered there is a special tool needed to remove the top of the fork tube. What is the tool and where can one get one?

  2. #2
    Liaison 20774's Avatar
    Join Date
    Sep 2005
    Location
    San Antonio, TX
    Posts
    20,430
    Are you wondering about #2 in this diagram?

    https://www.realoem.com/bmw/enUS/sho...diagId=31_0371

    The nut should be 41mm and is typically thin so there's not much to grab on to. The "tool" to get this off is a 41mm socket, preferably a 6-sided one, with the leading edge milled down. The milling gets rid of the inside chamfer of the socket so it can have full engagement on the nut.
    Kurt -- Forum Liaison ---> Resources and Links Thread <---
    '78 R100/7 & '69 R69S & '52 R25/2
    mine-ineye-deatheah-pielayah-jooa-kalayus. oolah-minane-hay-meeriah-kal-oyus-algay-a-thaykin', buddy!

  3. #3
    All my airheads had a wrench for that in the tool kit.
    '61 Clubman's Gold Star, '13 690 Duke, '13 Daytona 675R, '17 1290 GT, '18 Street Triple RS (gone but not forgotten: '76 R75/6, '84 R100, '76 R90S)

  4. #4
    Gerard jagarra's Avatar
    Join Date
    Aug 2016
    Location
    Reno, NV
    Posts
    377
    Here is a reasonably priced socket in 1/2" drive. When you get up to this size socket the drives get bigger like 3/4" and 1.0" which may require you to buy an adapter.

    https://www.ebay.com/itm/Genius-Tool...item4b3a752bde

    Now this one looks better, could fit under handlebars, but a little more $$

    https://www.ebay.com/itm/SCHLEY-PROD...oAAOSwfshbIj~g
    1994 R1100RS-(5/93)-,1974 R90/6 built 9/73,--1964 Triumph T100--1986 Honda XL600R

  5. #5
    Registered User
    Join Date
    Oct 2017
    Location
    Wesley Chapel, FL.
    Posts
    13
    Quote Originally Posted by 20774 View Post
    Are you wondering about #2 in this diagram?

    https://www.realoem.com/bmw/enUS/sho...diagId=31_0371

    The nut should be 41mm and is typically thin so there's not much to grab on to. The "tool" to get this off is a 41mm socket, preferably a 6-sided one, with the leading edge milled down. The milling gets rid of the inside chamfer of the socket so it can have full engagement on the nut.
    I am looking at #7 on the diagram. It is the spring retainer.
    Thank you for all of the information.

  6. #6
    Registered User
    Join Date
    Oct 2017
    Location
    Wesley Chapel, FL.
    Posts
    13

    spring retainer

    Can anyone tell me what type and size tool is needed to remove the spring retainer from the fork tube on a 1994 BMW R100RT.

    Thank you in advance.

  7. #7
    Liaison 20774's Avatar
    Join Date
    Sep 2005
    Location
    San Antonio, TX
    Posts
    20,430
    I don't find a whole lot written about it in my Haynes. But from the diagrams that we've shown, it appears that nut #2 threads onto the top part of #7 and sandwiches the upper fork between the nut and the flanges of #7. There's an o-ring (#8) that probably fits into the bottom groove on #7. From the diagrams, it just appears that #7 lifts out, working against the fit of the o-ring. Probably on the underside of #7, it's hollowed out enough to accept the spring that fits inside. I guess that's why it's called a spring retainer.

    Never been inside one of these later forks, but that's what it looks like from the diagrams.
    Kurt -- Forum Liaison ---> Resources and Links Thread <---
    '78 R100/7 & '69 R69S & '52 R25/2
    mine-ineye-deatheah-pielayah-jooa-kalayus. oolah-minane-hay-meeriah-kal-oyus-algay-a-thaykin', buddy!

  8. #8
    Registered User
    Join Date
    Oct 2017
    Location
    Wesley Chapel, FL.
    Posts
    13
    Quote Originally Posted by 20774 View Post
    I don't find a whole lot written about it in my Haynes. But from the diagrams that we've shown, it appears that nut #2 threads onto the top part of #7 and sandwiches the upper fork between the nut and the flanges of #7. There's an o-ring (#8) that probably fits into the bottom groove on #7. From the diagrams, it just appears that #7 lifts out, working against the fit of the o-ring. Probably on the underside of #7, it's hollowed out enough to accept the spring that fits inside. I guess that's why it's called a spring retainer.

    Never been inside one of these later forks, but that's what it looks like from the diagrams.
    Thank you for your help. Iíll give it a try tomorrow and let you know the outcome.

  9. #9
    Nope, it is more tedious than that. The enemy is part #6 - the snap ring. There is nothing to grip and compress it with like a normal snap ring with a couple of eyelets in it for a snap ring tool. Nope, with this one, you have to try to get a pick or a small screwdriver started behind it and force it out of the groove. Working against you is the spring pressure acting on part #7 spring retainer. The "solution" I found was to press down on #7 with a nut driver to free up the snap ring to be more easily pried out of its groove with your third hand.

    Seriously, some help is beneficial. There was one airhead model that had a similar devilish snap ring holding the wrist pins in. I think it was the 1977 R100RS. Others had more typical snap rings as this should have.
    Lee A. Dickinson - Danielsville, GA USA
    Airheads #3480 | Iron Butt Assn. #8914
    1992 R100RS - 1993 K1100RS - 2013 R1200GS

  10. #10
    Liaison 20774's Avatar
    Join Date
    Sep 2005
    Location
    San Antonio, TX
    Posts
    20,430
    Thanks, Lee. That's certainly an odd arrangement...almost like those notes on the back of some electronics "No serviceable items inside"...like BMW never intended for this to come apart. Hmmm...maybe Amazon has some "third hands" for sale?
    Kurt -- Forum Liaison ---> Resources and Links Thread <---
    '78 R100/7 & '69 R69S & '52 R25/2
    mine-ineye-deatheah-pielayah-jooa-kalayus. oolah-minane-hay-meeriah-kal-oyus-algay-a-thaykin', buddy!

  11. #11
    Quote Originally Posted by 20774 View Post
    Thanks, Lee. That's certainly an odd arrangement...
    It is. Oak used to talk about the infamous BMW "Verschlimbesserungs", or "improvements" that made things worse. This was one in my mind. The Brembo style forks from the twin shock era were of a reasonable design (though they did not function as well as the ATE style forks they replaced). But with the monos, they decided to take the Crazy Train. The mono Brembos retained the lower performance of the early Brembo design but made them frustrating to disassemble. Assembly is easy.

    I usu. replace the internals with RaceTech Gold Valves to make them function acceptably. That would make a good add while someone had them apart for service. The Gold Valves work best in conjunction with RaceTech single rate springs (instead of progressives).
    Lee A. Dickinson - Danielsville, GA USA
    Airheads #3480 | Iron Butt Assn. #8914
    1992 R100RS - 1993 K1100RS - 2013 R1200GS

  12. #12
    Registered User lkchris's Avatar
    Join Date
    Mar 2003
    Location
    Albuquerque, NM
    Posts
    6,257
    Quote Originally Posted by beemerphile View Post
    But with the monos, they decided to take the Crazy Train.
    In actuality, they simply used K-bike parts.
    Kent Christensen
    21482
    '12 R1200RT, '02 R1100S, '84 R80G/S

  13. #13

    that pesky c clip at top of fork spring retainer

    Hate this clip. Don't mind saying. Tho one "improvement" on pressing #7 retainer down to better access the clip. Yes, we can press it down easily enough, but definitely need both hands dedicated to clip. Get a hold of a ratcheting hold-down (Canoe roof hold-down works well) with large enough hook with no edges, just rounded enough at one end to not damage #7. Place hook into #7 then run the strap down & direct it along non-fragile areas to attach other hook. Ratchet it somewhat tight, then press #7 by hand to bottom out and ratchet to hold in that position. But I still think only bad things about that clip.

  14. #14
    Liaison 20774's Avatar
    Join Date
    Sep 2005
    Location
    San Antonio, TX
    Posts
    20,430
    Welcome to the forum! And thanks for providing some insight on how to tackle this!
    Kurt -- Forum Liaison ---> Resources and Links Thread <---
    '78 R100/7 & '69 R69S & '52 R25/2
    mine-ineye-deatheah-pielayah-jooa-kalayus. oolah-minane-hay-meeriah-kal-oyus-algay-a-thaykin', buddy!

  15. #15
    Registered User
    Join Date
    Aug 2006
    Location
    Boulder, CO
    Posts
    32

    Fork Spring replace

    Check out Brook Reams write up on removal of the cap nut on his '83 RS. Similar process with the '94?
    https://brook.reams.me/bmw-motorcycl...on-components/

Similar Threads

  1. 1994 K1100LT Fork oil
    By 1der in forum Flying Brick K-bikes
    Replies: 1
    Last Post: 06-15-2014, 12:19 AM
  2. How to replace R1100RT Fork Seals
    By happy wanderer in forum Oilheads
    Replies: 18
    Last Post: 07-21-2012, 07:55 PM
  3. 1994 R100rt
    By 2004ret in forum Airheads
    Replies: 4
    Last Post: 02-19-2009, 04:29 PM
  4. 1994 R100RT Fork Oil
    By KOBESGRANDPA in forum Airheads
    Replies: 5
    Last Post: 04-07-2008, 01:03 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •