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Old 01-22-2007, 12:48 AM   #1
Oddometer: n/a
Cry Having trouble with R100 tranny

Hi all.
Friend of mine are stuck in Equador, Quito, with a broken tranny.
He is trying to rebuild the gearbox, but found the parts to expensive.
So he is looking for someone or something which can transform the BMW part number over to other aftermarket part numbers. Like having part number (BM's) for the bearings in the tranny and then just walk over to the store and by Timken or SKF bearings which just fit right in.

Anyone who have been into this before?

Bike: R100GS/Sidecar rebuild with dobbel mono swingarm and car-wheels

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Old 01-22-2007, 03:20 AM   #2
Any bike can go anywere
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Joined: Jul 2006
Location: Hobart, Tasmania
Oddometer: 1,363
The only really "special" bearing in the box is the front input shaft bearing inner race, this is a standard parrallel roller bearing outer with a removable inner race, it is the inner that is different.
What makes it special isn't the size but that it is longer than standard so the front seal can run on it rather than the shaft.
The bearing that most often gives grief is the front bearing of the output shaft, but if the bike has sat for some time, the back bearing of the output shaft can bugger up as it is closest to the breather.
All bearings other than the front input shaft bearing are shallow groove ball bearings and so aren't weird or very hard to find.
The problem with any boxer gearbox rebuild is the shimming to get the dogs in the correct relationship to the gears, and the end float correct.

Wish your mate good luck for me.

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Old 01-22-2007, 04:11 AM   #3
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Joined: Aug 2003
Location: Charlottesville, VA
Oddometer: 4,312
I have the bearings cross-referenced on my website.
Anton Largiader
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Old 01-22-2007, 02:20 PM   #4
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Joined: Jul 2001
Location: Lausanne, Switzerland
Oddometer: 1,356
Originally Posted by helgaairhead
Anyone who have been into this before?
If you merely type "BMW R gearbox revision" in, you land on my gearbox page ... the parts list for the different years is in the "What you need" section, together with the tools list.
- Joerg

1990 BMW R80GS and K100LT * Lausanne, Switzerland
My Motorcycle WebPages - LED voltage monitor (aka charge light)
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Old 01-22-2007, 02:56 PM   #5
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Joined: Apr 2004
Location: Lexington, KY
Oddometer: 2,178
Originally Posted by AntonLargiader
I have the bearings cross-referenced on my website.
Nice site and info.

it makes everything better.
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