Center Stand Repair Revisited 1970-80

Discussion in 'Old's Cool' started by wirewrkr, Oct 18, 2008.

  1. wirewrkr

    wirewrkr the thread-killer

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    there have been a few different discussion recently concerning repairing stripped frame lugs for the centerstand for the 70-80 standard twins.
    One of the methods I used in the past when the damage was not too-too bad was a 7/16 fine thread bolt. it was easy enough to drill out the damage threads and tap to 7/16" fine thread and bore out the centerstand bushing so the bolt will pass through. BUT once in a while you get one that is just wasted.
    This 1975 R75/R90/6 belongs to a friend and 23 years ago I put TIMESERT inserts in the frame lugs which fixed the problen foir about 18 years or so.
    What we suspect now is that the use of the Ride-off stand has continued to decay and deform the lugs, because when I pulled it apart a few weeks ago, they were trashed. bent, stripped out (again) and rather than weld on new lugs, I came up with a better solution. (I actually did this on my R100S/RS several years ago and the current owner has no probs with it.
    Firts pic is of bent lugs.

    Attached Files:

    #1
  2. wirewrkr

    wirewrkr the thread-killer

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    next a tool was made to slip in between the engine block and lug to twist straight.
    It moves easily and no heat is required.

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    #2
  3. wirewrkr

    wirewrkr the thread-killer

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    Lugs were drilled out to 1/2" in steps. use as many drills as possible progressing up to 1/2" this will lower the likelyhood of drilling off center.

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    #3
  4. wirewrkr

    wirewrkr the thread-killer

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    making the insert. I tapped it for 10x1.25 pitch.

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    #4
  5. wirewrkr

    wirewrkr the thread-killer

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    Finished bushing

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    #5
  6. wirewrkr

    wirewrkr the thread-killer

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    bushing in place, nice tight fit, pulled in from back to front with new 10x1.25 bolt and bushing.
    #6
  7. wirewrkr

    wirewrkr the thread-killer

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    whoops here ya go

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    #7
  8. wirewrkr

    wirewrkr the thread-killer

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    and what is left on the backside. JUUUST enough clearance for the spring to pass by.
    Robert

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    #8
  9. wirewrkr

    wirewrkr the thread-killer

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    Oh yeah here's another bent lug picture, almost forgot.
    RVV

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    #9
  10. Bill Harris

    Bill Harris Confirmed Curmudgeon

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    Thanks for the write-up. I've not had a centerstand failure on my '73, but it probably wouldn't be a bad idea to start thinking of a pre-emptive repair on it.

    Like death and taxes, they go... :evil
    #10
  11. Wirespokes

    Wirespokes Beemerholics Anonymous

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    That's why I'm extremely careful of mine! Make sure the bolts are tight, everything is clean and lubed, and don't sit on the bike while on the stand.

    Thanks for the write-up Robert!
    #11
  12. Milagro

    Milagro Been here awhile

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    Perhaps a small cottage industry opportunity for us lathe-less folks? :ear
    #12
  13. Hawk Medicine

    Hawk Medicine Coyote's Brother

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    Hey!!

    I have a /6 frame with fracked center stand mounts too.

    Would you make me s couple pair of those inserts?
    #13
  14. Seb

    Seb Adventurer

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    #14
  15. wirewrkr

    wirewrkr the thread-killer

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    HOLY cow, I had no idea.
    If you are interested in these bushings, please check in the vendor section for my comments.
    Robert
    #15
  16. mspa

    mspa Been here awhile

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    The tool shown in the photo on post #2 . . . does anyone know if a similar type tool might be available at the hardware store or auto store? My box wrenches are too thick so I can't fit between the tab and engine.
    #16
  17. Bill Harris

    Bill Harris Confirmed Curmudgeon

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    That is a custom-made tool. Looks like a piece of 1/4" or 5/16" steel with a slot the size of the centerstand tab cut in it. Best thing todo would measure the dimensions it needs, get a bar of steel the right size and hunt up a machine shop. Five minutes work on a milling machine. Or a couple of hours of drill-and-file for the DIYer.

    The repair bushings are now available from Chris at BoxerMetal http://www.boxermetal.com/

    RIP Robert. :cry

    --Bill
    #17
  18. Tarka

    Tarka Doesn't wave back.

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    Maybe now you'll have time to do something about that horrendous collection of washers on that engine bolt? :evil
    #18
  19. FR700

    FR700 Heckler ™©®

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    :huh
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  20. Bill Harris

    Bill Harris Confirmed Curmudgeon

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    #20