Boyer Brandsen Electronic Ignition in 1979-1980 R65 Points Bean Can install
Although the directions are fairly clear, I went looking online for some installation help while installing a Boyer Brandsen electronic ignition on a R65 BMW that I am fixing up for a friend.
So… here is my install procedure. I am open to suggestions or tips but this is how my install went.
The carbs were tuned nicely before doing this install. The idle never seemed to get low enough which might indicate ignition problems.
I might suggest you get a spare bean can to perform this on. You end up modifying the original can somewhat and it may be difficult if you ever want to go back to stock.
I purchased this from Moto Bins in the UK and it arrived within a week.
Of course, you want to disconnect your negative cable from your battery before starting the procedure.
Gastank Removal is necessary for the wiring.
And remove the front engine timing cover.
I took the bean can cover off and front bearing before I started shooting photos. I was too eager to peek inside the bean can and see what is in there (It is my first time with a points in a can bike).
Notice the ‘e’ circlip on the center shaft. Put a rag over the can when you remove that clip just in case it tries to go flying across the garage. The rag might catch it.
After you get the center cam removed, be careful with the very small circlips that hold the bob weights. Those need to come off to get the bob weights off.
Now it is time for assembly of the electronic ignition!
This was the first hiccup. The magnetic rotor does not fit into the housing properly without bending the spring mounting tabs. They are not easy to bend so it took some work.
Note the next photo. The tabs have to align with the notches where the tiny circlips were. The new rotor should sit flat, spin freely and the large clip should secure it to the center shaft.
Another small snag. When the stator plate was installed with the cord going out the square hole, and the mounting screws were tightened, the magnetic rotor would not spin freely. It was a head scratcher in which everything was taken apart, put together again a few times. Finally by rotating the stator plate 180 degrees and making sure everything spins freely before securing the mounting screws, it happily went together.
I removed the diode board so I could route the wires behind it.
The green wire connects with the existing green wire terminal on the rear ignition coil.
I also connected the ground wire to the coil mount bolt as well.
Not photographed but I made about a 12inch extension wire to connect the black wire from the ignition unit all the way to the other coil to replace the wire on the terminal that was connected to the old points condensor. For some reason, they put shrink tubing on the wiring as if they all connect in the same vicinity. It was either make an extension wire, or cut up the clean tubing so the black wire could reach over to the other coil.
Once I got it timed, and I fussed with the idle a bit, it ran great. Really smooth and more responsive then before.