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Thread: 91 r100gs tranny bearing question

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  1. #1
    Rally Rat
    Join Date
    Nov 2009
    Location
    Central Ontario, Canada
    Posts
    271

    91 r100gs tranny - bearings and upgrades

    Hello all

    I have a R100 GS tranny open to do the circlip on the output shaft and will be changing all the ball bearings while I am in there. Do not know the mileage, the gears seem to be in good shape and it shifted by hand fine before i took it apart. As well there was little metal fillings nor had he output shaft been affected by not having the circlip (front bearing still tight to the helical gear)... looks like a good buy off ebay couple of years ago for $150
    I plan to refresh this tranny, use it on the bike while I refresh the original that is in the bike now that is all okay except for having to always lift the gear shift after a gear down before being able to make another shift down; something not returning in the shift mechanism likely.

    Reading through all the articles that i could find and reviewing my configuration I would like some advise on which bearings faces to leave open to oil flow versus having seals in place, pictures on sites show different configurations.
    The configuration I found is all open both side except for:
    output shaft rear: both seals in place (I understand the outer one with the dry drive shaft, but should the inside seal be removed for oil exposure?)
    intermediate shaft rear: seal in place against the rear housing only.

    I also plan to replace the plastic shift roller with the recommended bearing skf 628/8 or 688 (8x16x5) - can anyone report that this makes a significant improvement for shifting?
    Last edited by grahamm; 02-19-2013 at 11:49 AM.

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