The stock hinges for the seat are well known to break. Using stock parts they are expensive
and hard to replace. (Here is a
quick fix that I haven't
tried yet.) Why not make things so that they don't break in the
first place? They were made that way and with time things tweaked, twisted,
sagged and just plain got old. The design is for the seat to rest on the
rubber bumpers that are around the edge of the seat. Look at yours.
They have a impression where they have been sitting on the rear frame section
for the last century. To test if the seat is still resting on that rubber
piece, stick a piece of paper under each one, or one at a time. Close the
seat and see if the paper will pull out. If too many pull out easily, then
some/all of the weight is on the hinge and it will break. The easy fix is
to wrap black tape around the frame to build it up. Another fix is to
remove and tweak the hinges till they allow the weight to again rest on the
frame. That is risky as they could break and it takes a lot of time.
Do you have another way? I will evaluate it and if it is well thought out, I
will post it here and give you credit.
The /6 seat modification
BMW seats have one weak area, the hinges. They break off easily and are
a real pain to find and replace. There is another way to do it. I
forget who came up with this mod, but we thank him. The seat can be
modified to lift up off of the bike. This is a real advantage for the bike
with saddlebags. The entire locking system stays the same.
Here is what the bike looks like with the seat removed. We will use a
hole that is in the rear sub-frame. It is located on the right side and in
the center of the photo.
The parts used
The parts that are used in this mod are all normal parts.
1. A standard machine bolt 6mm threads and about 1 1/2" long.
2. A short piece of fuel line that is about 1" long.
3. A nut for the bolt.
This is what the seat looks like when the three parts are installed.
The nut locks against the seat pan to hold the bolt securely. The
makeshift post drops into the hole in the frame to keep the seat from moving
around. To open, just push the button, as before, and lift the seat up off
of the motorcycle.
While this works with the LWB models, a few
people with the SWB have made a plate to attach to the sub-frame. The
plate has the hole in it.
I have been using this mod for the last 25 years and I love it. I don't
have saddlebags to get in the way, but it is very nice to not have the seat fall
back into place and require opening again. I also don't have to buy and
replace a seat hinge every few years.
Email testimonial, 2 August, 2005
Well, the "Ausherman seat mod" is done and I wanted to thank you. It's
simple, it works, and it was 75 cents. Thanks again.
Seat Hinge Repair Kit
This repair kit by Joe
may be the way for you to go.