BMW Airhead R65 gearbox problem

Having some nasty problems with my Beemer. 5th gear sounds like the sound that occurs in the video, all the time now, and so does 3rd. I am currently in the progress of changing my gearbox, but I found that the one I bought is from a 1982 model, which apparently is incompatible with the flywheel on my 1979 R65. I suspect the problem coming from the gearbox, as 1st, 2nd and 4th works fine. Driven over 100 km since the problem first occured, using only 1st, 2nd and 4th gear without further problems.

[@USSEntrprise]

may be the gears that cracked or something like that. any update on the problem? i own a 82 r65 and the second gear makes a short but destinct scratching sound when i shift up or down unless its at a lower rpm.

[@Palm9moto]

Yes, one of the bearings that hold a rod on which some of the gears where on in the gearbox, was completely destroyed, so the rod with the gears on it was actually tilted around 20 degrees, causing the gears not to mesh properly, causing this sound.

[@anguswaddell6816]

Hi mate. Was this an expensive fix

[@thibaultdubaret9863]

​​@@anguswaddell6816 don't know if it helps but i just got all the bearing in my gearbox replaced, it cosg me about 650€