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Discussion Starter #1
I have noticed that my topcase sometimes comes open after going over a bump. Today, I had to stop three times as it 'just came open' even if I lock it before setting off again. Obviouslty it doesn't open all the way but a thud can be heard after going over a bump etc. Is there a fix for this as it quite annoying especially as I know I locked it?
Thanks in advance, Martin
 

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Wrencher Extraordinaire
2005 K1200LT
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14,350 Posts
That is a new one. Try pressing the top of the case down hard and see if the latch opens. If it does then check the little roll pins in the lid where the hooks go. I'll bet the hooks have "sawed" a groove in them. If so then this is an easy fix. BMW does not sell the pins but I am sure you can find a substitute. May even be able to turn them around so a new surface is presented.
 

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Wrencher Extraordinaire
2005 K1200LT
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14,350 Posts
Thanks Dick I knew I had seen part numbers but I could not find them. How do keep track of all those posts?
 

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Discussion Starter #5
There are little grooves worn into the pins. It'll probably be cheaper and easier to have the local machine shop make some pins. However, looking at the length of the hooks it must take quite a force to push them back so the pins can 'escape' and the top case opens even over the smallest bumps :(
 

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1999 LTC
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14,459 Posts
jzeiler said:
Thanks Dick I knew I had seen part numbers but I could not find them. How do keep track of all those posts?
I admit I just git lucky once in awhile, John. I didn't even remember to check the part number list (I think they're in there somewhere?). I do use the 'search' function a lot, cuz my memory bank has blown out too damn many candles over the years!! ;) ;)

Edit: Hey, John. Thanks for the hint about part numbers. Sure enuf, they were in there.

These pins from the K11LT EXACTLY fit the rear trunk lid of the K12LT. The K12LT parts list does not separately call out these latch pins.
46-54-2-316-317 Pin ($1.65 ea.)
07-11-9-932-815 E-clip ($0.10 ea.)
 

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Discussion Starter #7 (Edited)
If I were to put a sleeve over each pin, should that hold the lid closed?

What I cannot understand is how the lid can 'pop open' even after locking it! This morning I checked the lid TWICE before setting off for work, I even gave the lid a gentle tug as I was riding along, it was still closed. Upon arriving in the city another motorcyclist pulled along side and said the lid was bouncing as I was riding along. Upon parking up at work I checked, the lid was open and the locking arms were still locked in place and with very little free play on them. I can't see anyway they could have been pulled open then snapped shut again.
 

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Wrencher Extraordinaire
2005 K1200LT
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If the hooks are closed and it is still opening , then maybe the hooks never engaged the pins. Close it and lock it then try to lift the lid. If it opens then the hooks were not engaged. If it doesn't open then I am at a loss to explain how it can open going down the road.
 

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Discussion Starter #10
jzeiler said:
If the hooks are closed and it is still opening , then maybe the hooks never engaged the pins. Close it and lock it then try to lift the lid. If it opens then the hooks were not engaged. If it doesn't open then I am at a loss to explain how it can open going down the road.
I too can't understand what's happening because after closing the lid I try to open it without using the lock mechanism and it won't open. However, when I pull up after the lid has magically opened the locks are in what seems to be the correct position!

Can I post pictures here, maybe the locks are NOT in the correct position. They sit horizontally, that is correct isn't it? :confused:
 

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1999 LTC
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Martin - unlock the keyed latch plate and pull it out at the bottom; open/lift the lid to the max position and leave it open; push in the latch plate and watch the action of the two pin ARMS as they close over the location where the pins would normally be. Now try to move the ARMS. Do they move at all? Now lock the latch plate and try to move the ARMS again. Any movement?
 

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Discussion Starter #12
Dick, I'll give it a try later on. the bike ins in the garage and I'm at work. Thanks for trying to help.
 

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Wrencher Extraordinaire
2005 K1200LT
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I am with Dick on this one. The hooks should not move at all once you close the latch plate. If they do it is time to pull the liner and have a look at the mechanism. There are little "E" clips that can pop off of the linkage pins and cause all kinds of grief. Mostly a top case that won't open even with the latch pulled out.
 

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Lock the case with it closed and see if it still happens. I don't see how it could possibly open up without the latch opening up as well. If it does, something must have failed in the latch.
 

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Discussion Starter #15
Thanks to everyone here for offering suggestions. I have a feeling that the mechanism is at fault as I have discovered there is some play on the hooks which IS allowing the topcase to open even when locked. The next issue is do I remove the liner to check the circlips etc.?
 

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Aside from your situation, I'm curious as to how the top lid is moving when open? I rarely actually latched my 02 and it never opened or moved when I was riding. Latching and locking was a rare event.

Must be some very bumpy roads and worn shocks?
 

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Discussion Starter #17
DanDiver said:
Aside from your situation, I'm curious as to how the top lid is moving when open? I rarely actually latched my 02 and it never opened or moved when I was riding. Latching and locking was a rare event.

Must be some very bumpy roads and worn shocks?
All down to bumpy roads and urban areas tend to have a lot of speed bumps, funnily enough called 'spring breakers' in the local language. However, if you go over them too fast it's not funny at all!
 

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Discussion Starter #18
Upon arriving home from work today I noticed that my top case was difficult to close. After further investigation it truns out that the 'bridge' which holds the locking mechanism has come loose. The rivets have worked themselves out of their holes! I think the best fix will be small SS bolts and nuts with nylon locking rings.

Has this ocurrence happened to anyone else?
 

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2005 K1200LT
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That is a new on me. Sounds like your idea to fix them will work just fine. Glad you found the reason.
 

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Discussion Starter #20
After just replacing the central rivet with a SS nut and bolt, the mechanism seemed to work fine. I got to work this morning just to discover I can't open the topcase anymore! I tested everything before putting the bike to bed and has no issues at all. Now the problem is how can I open the topcase without damaging it?
 
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