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Old 10-18-2008, 04:48 PM   #1
wirewrkr OP
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Center Stand Repair Revisited 1970-80

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.
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wirewrkr screwed with this post 10-18-2008 at 05:03 PM
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Old 10-18-2008, 04:51 PM   #2
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Cont.

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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Old 10-18-2008, 04:54 PM   #3
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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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Old 10-18-2008, 04:56 PM   #4
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making the insert. I tapped it for 10x1.25 pitch.
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Old 10-18-2008, 04:57 PM   #5
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Finished bushing
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Old 10-18-2008, 04:59 PM   #6
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bushing in place, nice tight fit, pulled in from back to front with new 10x1.25 bolt and bushing.
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Old 10-18-2008, 05:00 PM   #7
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whoops here ya go
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Old 10-18-2008, 05:01 PM   #8
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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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Old 10-18-2008, 05:09 PM   #9
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Oh yeah here's another bent lug picture, almost forgot.
RVV
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Old 10-18-2008, 05:57 PM   #10
Bill Harris
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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...
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Old 10-19-2008, 10:05 AM   #11
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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!
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Old 10-19-2008, 02:09 PM   #12
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Perhaps a small cottage industry opportunity for us lathe-less folks?
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Old 10-19-2008, 03:10 PM   #13
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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?
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Old 10-19-2008, 04:31 PM   #14
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I've had a failure in the centrestand, and just the other day the sidestand snapped off. Apparently very common.

My solution is just buy a universal sidestand and be done with it.

http://bmwscotter.com/procedures/cen...enterstand.txt
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Old 10-19-2008, 06:15 PM   #15
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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
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wirewrkr screwed with this post 10-20-2008 at 11:08 AM
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