I do all my own work also, saves money that way. I started to tear the M97 apart and do the input shaft change like you mentioned. I talked to Bruno and he told me to put the N97 in and run it. I may keep the M94 tranny for a later rebuild, but then I may sell it or part it out. I did put new seals in the M94 on the first go round.
It is up to you and what you fell like doing and the time frame you have to do the swap. If you have the time, change it out. Changing the input shaft, that is up to you.
Originally Posted by RAL88
This thread has been a great help. I just picked up a '95' R1100GS with 15,000 miles on it. Having heard about the transmission I also found a '99' M97 with 13,000 miles on it.
I do all my own work on my bikes and rebuilt the transmission on my '96' R1100RT.
Since the bike has been garaged sinced '98' I will be going through it with a fine tooth comb and this will include a spline lube. Would the recommendation be to change out the old M94 with the M97, Run the M94 until it has a problem and then put in the M97 or swap out the weak input shaft of the M97 with the input shaft of the M94 and then put in the M97.
Any insight would be most helpful.