BMW did not make any parts interchangeable in between the R11xx bikes and the older "airheads". Some people are working on a driveshaft fix. Touratech has a driveshaft but I know someone who tried it and it did not fit inside the paralever case. Touratech told him to grind out the inside of the case. He sent the driveshaft back and got a credit for other Touratech stuff, not a refund.
People are working on a fix go to: www.ibmwr.org/ click on searshable archives, subject driveshaft, under both technical and general dissussion.
also www.airheads.org/ and the GS owners list www.gs-owner-list.de/index.htm (german) www.rcb.org/bmw-gs.htm (river city beemers)
Put your bike on the centerstand in neutral
and turn the rear wheel in the normal direction of travel. If it goes "clunk-clunk)
I would get a new driveshaft. Also watch the needle sleeve bearings just forward of the reardrive.
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