The standard BMW tool kit comes with a multitude of tools.
Some of them are quite specific and make maintenance of the bike much easier.
Here are some home made equivalent tools in case they are missing from your kit.
There are also some drawings for official BMW workshop tools.
This tool is used for undoing the swinging arm bolts.
A replica can be made by slicing a standard box spanner and adding a handle.
Two things to note. Box spanners typically come in a 27/36mm combination or 24/27mm. The 24/27mm has a thinner wall section and will therefore more likely fit into the swinging arm recess.
Second, if you weld a simple handle across the centre of the spanner it prevents you using it in combination with an Allen key when locking the bolts down. Drilling off centre makes it a more usable tool.
The handle shown here was made from 8mm steel and knurled part way along.
When brazing or welding this tool, avoid the fumes which may contain chromium from the spanner metal.
On the other end of this BMW tool is a 36mm flat wrench for undoing the fork top nuts. A socket can be used, but the nuts are very thin in section and they pull up flush to a washer so the socket must have no chamfer in it, otherwise is it likely to slip during use.
Most sockets do contain a chamfer on the leading edge so this should be ground off as square as possible, or preferably machined off in the lathe.
This socket has to tighten the fork nuts to a whopping 120Nm so it is important that it grips the nut as securely as possible.
This is a short ring spanner adapter to allow a torque wrench to be used to tighten the 12 sided bolts on the gearbox output flange. There is not enough clearance in the Hook's joint to get a traditional socket on these bolts.
A similar tool can be made from a standard ring or combination 10mm spanner and a 1/2" to 3/8" socket adapter. The distance between the centre of the ring spanner and the centre of the square drive should be as close to 44mm as you can get.
The end of the socket adapter was machined off to leave a large flat area to weld to. Then the spanner was welded in place as shown; this needs to be a strong joint to take the 42Nm of torque which is needed to tighten the nuts properly.
Avoid the fumes from the welding.
3d print file can be downloaded by clicking on the image above.
Print in PLA with 100% infill.
Smooth off bore with wet'n'dry paper if needed.
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