R1100GS transmission case welding

Discussion in 'GS Boxers' started by cnmjr123, Apr 15, 2021.

  1. cnmjr123

    cnmjr123 Been here awhile

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    A64E5281-D896-46AB-A3D6-CD3E119F2131.jpeg I really screwed the pooch on the ol’ GS: two broken footpeg mounts.

    I know, I know... TT hard parts! Too late for that now!

    I’ve been contacting local welding shops to get it repaired.

    How worried should I be about frying the ECU and other electrical components? Anything I should disconnect or remove prior to welding?

    Thanks
    #1
  2. lewisjr1

    lewisjr1 Long timer

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    Definitely disconnect the battery cables. I'd at least remove the battery altogether. Some will say going as far as unclipping the wiring harness from the ECU is unnecessary. As easy as it is to do, however, I would.

    I haven't owned an 1100 model bike, but I gotta ask... Would it make sense to just buy another transmission?

    And for what it's worth, Heed now seems to offer their ver. of the hard parts... https://heedshop.eu/en_US/p/Transmi...-1100-GS-R-850-GS-R-1100-R-R-850-R-silver/498
    #2
  3. cnmjr123

    cnmjr123 Been here awhile

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    Appreciate your advice @lewisjr1

    I’ll start looking for a used transmission as a final option. I was hoping not to source a used transmission, split the bike, rehab the used transmission, etc...

    If the welding doesn’t work, I may end up looking for another R1100GS and keep this one for parts.
    #3
  4. danisOTR

    danisOTR Living Life on the Road Supporter

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    Anton came through with a transmission case for me. I had it installed and out hard parts both of my 1100’s.

    http://largiader.com/

    Hard parts came from Poland. Took a few weeks to get.
    #4
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  5. cnmjr123

    cnmjr123 Been here awhile

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    Is the transmission case anodized or painted? The silver layer on the outside seems pretty tough
    #5
  6. Blu_Vue

    Blu_Vue Nothing is what it seems.

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    I’ve been down that road. I consulted with a few welding pros, and none would even touch it. That metal is very porous, for one thing, and very hard to clean it up enough to weld effectively. I wound up replacing the trans. +1 on the recommendation to call Anton.
    #6
  7. cnmjr123

    cnmjr123 Been here awhile

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    I’ve got a guy who’s willing to try it, I figure I have nothing to lose at this point. He gave me the “red light guarantee”: the welds will hold long enough to leave his driveway, once he can’t see the tail light, it’s out of his hands :D

    I figure I’ll try the easiest thing first then weigh my options. I need a trans output shaft seal at this point so the trans may come out over the winter if it lasts that long.
    #7
  8. slacker1965

    slacker1965 .....no matter where you go......

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    Unplug ECU!!!!!!!
    I am too lazy to take a pic of the decals on my welding helmet, the race teams that I worked for made them for a reason.....
    If your TIG guy cleans it up real good & pre heats it you will prob be fine, just change oil afterwards...

    I bought my hard parts fm ADVmotorad a few years ago, he may do ADVrider discount

    Keep us posted

    Good luck!!!!
    #8
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  9. cnmjr123

    cnmjr123 Been here awhile

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    @slacker1965 School me on the reason for the oil change? The heat associated with the welding? Trans or engine oil too?

    Thanks
    #9
  10. JimVonBaden

    JimVonBaden "Cool" Aid! Supporter

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    I wouldn't worry about the trans oil, it is far from there. I would weld, then pull the swingarm bearings and check for damage.
    #10
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  11. slacker1965

    slacker1965 .....no matter where you go......

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    See Jims post, he knows way more than me..... I was kinds of thinking of any bits that may have gotten real hot & def if anything blows thru.....
    #11
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  12. JimVonBaden

    JimVonBaden "Cool" Aid! Supporter

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    But I would bet you know far more about good welding! :-)
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  13. slacker1965

    slacker1965 .....no matter where you go......

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    I have worked with some excellent craftsmen & welders yes. I know just enough to be dangerous
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