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Old 01-07-2013, 09:27 AM   #1
Uncledeadly OP
Gnarly Adventurer
Joined: Oct 2006
Location: BC, Canada
Oddometer: 169
Transmission swap questions 1100GS

The rear bearing on the input shaft let go on a trip last summer and I'm finally getting around to getting that bike rolling again. M97 transmission, 3/97 stamped on the steering head of the bike.

I tore the transmission out and split the case, found that the bearing let go, heated up and spun the rear seal on it's bore and on the end of the input shaft (bore looks OK, shaft is toast!). When it heated up it made a molten mess of the pushrod piston assy. and oil migrated up the shaft, contaminating the clutch friction plate.

I found a great looking used input shaft assy from a 95 RS (M94) and was planning on rebuilding the existing transmission until somebody suggested trying to find a good used box.

New plan. I found a good looking used box from a 98 RT that came with the pushrod assy. splines and seals look great.

Some questions have arisen after reading and research and I'm looking for some good input and advice from somebody who has maybe "been there and done that".

1. I have no complaints with how the OEM clutch was working but if there is something better that doesn't break the bank, I am all ears. ( not really into the VW option though :)) I am , at this point, hoping to change only the friction plate but will see what the pressure plates look like when I take them apart tonight.

2. I have read where some guys are changing up the clutch spring with an 1150 spring (stronger?). Is this the only thing that needs changing, and is it a straight over swap with my existing spring (mfg 3/97)?

3. I believe that there was a clutch upgrade in , around 12/97 as I have seen clutch parts listed pre 12/97 and post 12/97. What was changed and will the "post 12/97" RT pushrod assy be compatible with my existing clutch assy?

Looking forward to hearing what you have to say
'97 R1100GS
'71 Norton Commando
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