LT broken mirror repair - BMW Luxury Touring Community
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post #1 of 9 Old Jul 9th, 2019, 10:27 am Thread Starter
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LT broken mirror repair

As I posted earlier in my Alaska thread, the front mount on my left mirror broke during the trip. I finally got time today to start the repair. I did a somewhat similar repair on the right mirror several years ago and it seems to be holding, but I did not take any pictures of that repair as I quit frankly did not expect it to last long.

Here is what I did today. I Dremeled out the broken surfaces to true them up a little and cut a piece of ABS sheet stock to fit. The sheet stock is a little thinner than the piece that broke out, but I plan to add a second layer over the glass so that should help. It looks like I have enough clearance on the bike around the ball mount to tolerate the extra thickness.

I added a piece to roughly replace what broke out. I then added a second piece on the end perpendicular to the first to serve as an additional gusset. It was a bugger to get in place with the ABS cement on it, but a pair of curved forceps helped get it roughly in place. I then lathered the outside well with ABS cement (standard plumber’s cement and primer was used) and pressed one layer of glass cloth into it. I will let that harden for 24 hours and then add another layer of ABS sheet over it to make a sandwich. Hopefully, this will hold as well as the other side has.
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beech, bmwcoolk1200 and kbob12 like this.

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1987 Kawasaki Voyager XII
1976 Kawasaki KH400
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1970 Rockford Chibi (the orange one)

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post #2 of 9 Old Jul 9th, 2019, 12:17 pm
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Re: LT broken mirror repair

I decided to just drill, tap and screw mine on, at least for now. Looks like a good repair though. I hope it holds up like the other side has.

Gordon
Sugar Hill, GA
2001 K1200LTI – Champagne (current ride) Lazy Susan
1998 R1100RT – Never should have sold it
1974 Yamaha TX 750 Twin. Omni Phase Balanced


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post #3 of 9 Old Jul 9th, 2019, 1:00 pm Thread Starter
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Re: LT broken mirror repair

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Originally Posted by bmwcoolk1200 View Post
I decided to just drill, tap and screw mine on, at least for now. Looks like a good repair though. I hope it holds up like the other side has.
That is my backup plan. Where did you drill? The flat metal strap that the ball mounts to? It felt like the was something behind that strap and I am hesitant to drill into something I can’t see behind.

2017 KLR650 "Mule"
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1976 Kawasaki KH400
1973 Kawasaki 100 G5
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post #4 of 9 Old Jul 9th, 2019, 1:09 pm
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Re: LT broken mirror repair

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Originally Posted by Voyager View Post
That is my backup plan. Where did you drill? The flat metal strap that the ball mounts to? It felt like the was something behind that strap and I am hesitant to drill into something I can’t see behind.
Will take a picture but yes, there is a metal strap/plate behind the plastic in certain places.

Gordon
Sugar Hill, GA
2001 K1200LTI – Champagne (current ride) Lazy Susan
1998 R1100RT – Never should have sold it
1974 Yamaha TX 750 Twin. Omni Phase Balanced


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post #5 of 9 Old Jul 9th, 2019, 2:24 pm
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Re: LT broken mirror repair

I have done what you have done except I weld the plastic as I don't like using glue. I have gotten pretty good at it with a couple of dedicated welding tips for my Weller Temp controlled soldering station. Have not had a weld break yet and I have done body panels as well.

John
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post #6 of 9 Old Jul 9th, 2019, 9:20 pm Thread Starter
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Re: LT broken mirror repair

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I have done what you have done except I weld the plastic as I don't like using glue. I have gotten pretty good at it with a couple of dedicated welding tips for my Weller Temp controlled soldering station. Have not had a weld break yet and I have done body panels as well.
Well, ABS cement is not technically a glue. Is performs a solvent welding operation and is every bit as strong as a thermal weld, often stronger as you have more surface area. I am not a big fan of glues either which is why I use solvent cement rather than epoxy or cyanoacrylate.
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post #7 of 9 Old Jul 10th, 2019, 6:47 pm
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Re: LT broken mirror repair

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Well, ABS cement is not technically a glue. Is performs a solvent welding operation and is every bit as strong as a thermal weld, often stronger as you have more surface area. I am not a big fan of glues either which is why I use solvent cement rather than epoxy or cyanoacrylate.
True but I feel I have better control on the thickness of the "weld" and can build a better bond over a larger area with more strength over just where the solvent touches. Especially on the small area for the mirror clips and it allows me to "shape" the area better.
Plus I just never seem to have ABS solvent around, lots of PVC and CPVC though.

John
2009 K1300GT Red Rocket
2009 R1200GS (Gone)
2005 K1200LT Ocean Blue Blue Wizard 110 K and counting...
2006 Bushtec Turbo+2 Spell
2004 330 Ci Convertable
K4AN

Have ridden a Motorcycle in all 48
But lack DE, MA, RI and CT with the 2005 LT

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post #8 of 9 Old Jul 10th, 2019, 7:48 pm Thread Starter
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Re: LT broken mirror repair

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Originally Posted by jzeiler View Post
True but I feel I have better control on the thickness of the "weld" and can build a better bond over a larger area with more strength over just where the solvent touches. Especially on the small area for the mirror clips and it allows me to "shape" the area better.
Plus I just never seem to have ABS solvent around, lots of PVC and CPVC though.
I have only bought the all purpose cement since it was first available. That way I always have the right kind.

Much depends on what type of joint you have. If you are butting two sheets together, then thermal welding might be a little stronger as you can build up a bead. However, if you are joining a pipe into a fitting, then welding around the external joint would give you very little surface area compared to solvent welding the pipe into the fitting where you can get the full surface between the pipe and the fitting welded together. That gives probably 6-10 times the surface area and is far, far stronger.

https://www.lowes.com/pd/Oatey-8-fl-...Cement/4750817

2017 KLR650 "Mule"
2007 K1200LT "Starship Enterprise", VOICE II, Navigator V, Motorrad Communicator
1987 Kawasaki Voyager XII
1976 Kawasaki KH400
1973 Kawasaki 100 G5
1970 Rockford Chibi (the orange one)

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post #9 of 9 Old Jul 12th, 2019, 1:41 pm
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Re: LT broken mirror repair

Do you do hip joints?

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2004 K1200LT, bought Oct 2018 w/29K miles.
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