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Old 04-29-2012, 06:05 AM   #1
seevtsaab OP
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Joined: Nov 2009
Location: Smugglers Notch VT
Oddometer: 192
1100RS subframe break

So now I know something about the rear subframe strength on the 94 1100RS.
Purchased locally late last year w/ 130K miles in great condition.
Added Givi rear rack. Bike shares commuting duty, getting the call on coldest and wettest days.
The rack carries my backpack with laptop and occasionally groceries.
The rear subframe has broken immediately behind driver seat (typical spot).
There was an TSB update to this year subframe as BMW added rear case option.

Thoughts on options to strengthen the subframe? Planning to have a mild steel rods inserted, not
sure if there's room for much bracing.
(twinz yes I've changed the oil!)




seevtsaab screwed with this post 04-29-2012 at 01:51 PM
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Old 04-29-2012, 06:24 AM   #2
mike54
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Caribou sells a tail rack brace kit. here I used to have the wunderlich one on mine but they don't sell it any more. But I packed a lot of gear on the tail rack and bounced down some rocky trails and never had an issue. The one that Caribou is selling looks like it would function similarly.

I think if you put slugs in when you weld in back together and add some bracing like in the kit from Caribou, it won't break in that spot again.
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Old 04-29-2012, 11:04 PM   #3
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On my R1150GS I replaced the arms with inch and a half slotted/drilled angle iron all the way back to hold a top box. Can't do this on a RS but maybe something similiar? It's also a good idea to add a triangular plate at the intersection for added strength.
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Old 04-30-2012, 04:26 AM   #4
AntonLargiader
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My approach: find a good/used newer subframe and replace (or modify) the rear seat to match.
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Old 04-30-2012, 11:02 AM   #5
seevtsaab OP
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Quote:
Originally Posted by AntonLargiader View Post
My approach: find a good/used newer subframe and replace (or modify) the rear seat to match.
Thanks All - I've hedged my bets and located a newer one, looks to have the same tranny mount so that's a plus.
I'll see what the seat mod entails. I'm also planning to take my old one to a welder to see what he can do, in case
I discover fitment issues (replacement is from '95 so oughta be fine).

Anton - I came across a nice RS summary of yours in my search - nice.
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Old 04-30-2012, 01:42 PM   #6
Mike Figielski
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Quote:
Originally Posted by seevtsaab View Post
Thanks All - I've hedged my bets and located a newer one, looks to have the same tranny mount so that's a plus.
I'll see what the seat mod entails. I'm also planning to take my old one to a welder to see what he can do, in case
I discover fitment issues (replacement is from '95 so oughta be fine).

Anton - I came across a nice RS summary of yours in my search - nice.
You'll want to be sure it is the upgraded one from a bike built after 5/95 or you will get the same crack prone frame you already have. We have them (on sale!) at Beemerboneyard if you need one: http://www.beemerboneyard.com/46512320698.html
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Old 05-01-2012, 11:37 AM   #7
seevtsaab OP
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Thanks Mike! not sure if I'll need it - but I ordered one yesterday (shipping to VT).

Had a local guy weld in rods (about 12"long) so I'll give that a shot.
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Old 05-01-2012, 12:18 PM   #8
Mike Figielski
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Thanks! The rods may work. I had mine fixed like that for a while before I grabbed one from our stock a couple years ago.
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Old 05-07-2012, 08:03 AM   #9
seevtsaab OP
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Update - fixed - I used the frame from Beemerboneyard as the one I had repaired wasn't aligned exactly right.
I had the replacement available so I used it - with exception of the passenger pegs (one frozen bolt) it's all back
together and parked here at work.
I'm now too familiar with everything on the bike except where I need to be: final drive, valves, alternator belt.
Soon.

Thanks for the support! Anyone want a used frame with a misaligned tail (about an inch too wide at the tail peice?)
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