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Thread: Hi, new and already have a transmission repair question.

  1. #1
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    Hi, new and already have a transmission repair question.

    Hello, David House here. I've been the proud but frustrated owner of an 83 BMW R65 since December 2012. Rebuilt the carbs, replaced the coil and the engine runs great. But.... when I took it out for a test ride yesterday, was winding through the gears and from 4 to 5, the tranny made this sound of dogs and gear slots not meshing. Sound stopped upon deacceleration. The bike still shifts through the gears, but only at the lowest of throttle. If any torque is applied in any gear, the grinding sound occurs. Do I have a tranny rebuild on my hands? Any suggestions for a quick fix?

  2. #2
    Registered User toooldtocare's Avatar
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    Does not sound healthy. My first BMW I bought new, a 1986 R80RT that ran perfect until one day it did pretty much as yours. My problem turned out to be stripped splines in the clutch and input shaft. The bike had about 35K on it at the time. Whatever it is, it needs to be looked at.

    Wayne

  3. #3
    Registered User PAS's Avatar
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    Have you drained the gearbox and checked the oil for metal? Take out the rubber timing plug and see if there is any metallic dust inside. Stick a pencil magnet in and see if anything sticks to it.

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    If you are not absolutely sure the sound comes from the transmission do not forget
    Splines at rear end of drive shaft
    Spline cup in rear wheel

  5. #5
    Registered User dmftoy1's Avatar
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    No suggestions for a quick fix but had Tom Cutter at rubber chicken racing garage go through my r90/6 recently and he treated me fairly. Tranny shifts much nicer now.

    Good luck,
    Dave

  6. #6
    Administrator 20774's Avatar
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    Pull the rubber boot back where the tranny is bolted to the driveshaft...make sure all those bolts are in place and tight.
    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!

  7. #7
    Registered User krpntr's Avatar
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    And if they are tight get some new ones because your going to pull the trany. If they are lose, replace them.

  8. #8
    Sir Darby Darryl Cainey's Avatar
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    Quote Originally Posted by Krpntr View Post
    And if they are tight get some new ones because your going to pull the trany. If they are lose, replace them.
    I have used those bolts multiple times over.

    I keep a set just in case but If you can thread them in easily by hand they are OK.

    From a retired metallurgist.
    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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    Thanks, all

    Thanks for all your responses. Will check out all suggestions, including finding a reputable BMW repair shop to work this problem out. Sounds like it is beyond my capabilities.

  10. #10
    Registered User lmo1131's Avatar
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    Name your location, there are folks here on the boards spread out all over the US and Canada; some one will know of a shop that can help you out. There's also the Resources & Links page to refer to.
    "It is what you discover, after you know it all, that counts." _ John Wooden

    Lew Morris
    1973 R75/5 - original owner

  11. #11
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    Newbie's location.

    Quote Originally Posted by lmo1131 View Post
    Name your location, there are folks here on the boards spread out all over the US and Canada; some one will know of a shop that can help you out. There's also the Resources & Links page to refer to.

    I am located in Rehoboth, Massachusetts, about 10 miles east of Providence, RI.

  12. #12
    . AntonLargiader's Avatar
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    Sounds like the ears are broken off the input shaft gear. It does exactly what you describe, and it's a known issue for those years.

    ears.jpg
    Anton Largiader 72724
    largiader.com bmwra.org

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