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Thread: That imfamous transmission detent spring--broken again.

  1. #1
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    That imfamous transmission detent spring--broken again.

    I have a 1979 R90/6 with 100,000 mi and this is the 2nd time I have had this spring problem--trans stuck in 2nd gear and will not shift. The last time the spring broke, it was about 20 years ago at amost 50,000 mi. The last time I removed the trains and delivered to a dealer to fix at about $450 back then. The price is $575 now and I'd like to tackle it myself this time. I have the Sep 03 Gary Smith ON repair article and a repair manual, but I'm lacking the special tools (nut puller and nut screw) to remove the drive flange nut and flange. If anyone has these rarely used tools and wouldn't mind renting or lending them, I'd appreciate hearing from you. Any advice on doing this job would be appreciated as well. My name is Richard and my email is Nostlgiagifts@yahoo.com, phone: 321-254-2933--Cheers!

  2. #2
    Administrator 20774's Avatar
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    Snowbum has some pretty good diagrams for making an emergency shifting tool:

    http://bmwmotorcycletech.info/emerge...fting-tool.htm

    Not what you need, but something to look at and consider.
    Kurt -- Forum Administrator ---> 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
    Registered User kioolt's Avatar
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    I could have used that tool 31 years ago on my 82 R100RT.
    2004 R1150RT 151,500 miles , 1991 K100LT 128,000 miles, 1982 R100RT 106,900 miles
    Total 386,400 BMW miles
    AMA,BMWRA,BMWMOA
    The cheapest thing on a BMW is the nut that connects the handlebars to the seat.

  4. #4
    Sir Darby Darryl Cainey's Avatar
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    If anyone is interested a machinist friend makes them in Dunnville Ontario Canada.
    Not sure how much but I can ask, I always carry one in my tool kit.
    Ambassador BMW MOA Ontario Canada
    President Niagara BMW Riders #298
    Knights of the Roundel #333
    1977 R100RS, (Retired) 1993 R100GS (just getting started)

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    Neutral detend spring

    Saw your post. My '74 R90/6 detend spring failed around 50k miles also. Maybe you know this already, BMW of Marin said the shaft that the shift lever attaches to was not machined correctly and the spring would hang up in the front or rear position instead of centering as it should. After so many miles of being hit by something in the trans, I am not a trans expert, the end would break off and you are stuck in whatever gear, mine was third gear. Yellowstone park to Santa Rosa, CA., in third gear. After repair, no more problems. Hope this helps. J Terry, Paradise, CA.

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    Question Prevent?

    Isn't there some upgrade or modification you can do to prevent this situation?

  7. #7
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    Quote Originally Posted by jforgo View Post
    Isn't there some upgrade or modification you can do to prevent this situation?
    Snowbum discusses it in Section 9A on this page:

    http://bmwmotorcycletech.info/transmission.htm

    Anton talks about the shift kit here:

    http://www.largiader.com/tech/airtrans/
    Kurt -- Forum Administrator ---> 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
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    Thank you! How does OP have a 1979 R90/6? - wasn't 1976 last year for those?

  9. #9
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    Quote Originally Posted by jforgo View Post
    How does OP have a 1979 R90/6? - wasn't 1976 last year for those?
    Good catch...probably fat-fingered it! Unless he put an R90/6 into a 1979 frame??
    Kurt -- Forum Administrator ---> 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!

  10. #10
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    That infamous transmission detent spring-broken again.

    You're right, wrong year--it's a1974 R90/6--and at 6'6'' I do have big fingers. Does anyone have that special drive flange tool? Richard

  11. #11
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    Quote Originally Posted by 15385 View Post
    Does anyone have that special drive flange tool?
    Dan at Cycleworks sells all kinds of tools that are pretty dang good.


    http://www.cycleworks.net/index.php?...roducts_id=321
    Kurt -- Forum Administrator ---> 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!

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