This makes bike #4 I have gotten out in the Desert. Three R75/5 models and one R90/6.
Just the way I like them too… cheap and dead. I can’t allow myself to chop up a good condition BMW motorcycle but when they come to me like this, I can get creative. Luckily it came with a good condition toaster tank.
This one is going to be restored for a guy who spent the last 6 years building hospitals in Saudi Arabia. He wanted to treat himself to a BMW or two when he returned so here we go!
We’ll probably upgrade this engine a bit, go to a 5 Speed kick start, and get this ready to tackle the roads and hills in Michigan.
This is weird. A friend sent me a link to some YouTube videos that people made with the photographs of the bike I built for Shane.
This guy needs some editing skills. Could have been shorter with the photos cropped better:
When I first got this bike, I had to use all my muscle to rock it off of the center stand. It made me wonder about the R65 model… but then I realized that both tires were still touching the ground while it was on the center stand. I still wasn’t sure if this was correct or not. I thought it could have been on of the R65 quirks until a local mechanic friend told me it was due to the center stand being slightly bent.
So the bike went back up on the lift…
The front wheel no longer touches the ground and it is much easier to rock off the center stand. I could have built up even more material so it would sit a bit higher but I was being conservative. I wasn’t really sure how much was too much. But for now, the problem is solved.
This thing has been making progress… slowly but surely… Parts take forever to get and it needed a complete tear down.
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.
I can’t remember the condition of this final drive when I assembled my 77 R100s back in 2003. When I had my rear tire replaced recently, I noticed how terrible the splines are. The splines on the wheel are better then the final drive but they will need replacing someday too.
I found this drive with the same ratio and cleaned it up and replaced the spline. Now it is time to swap the drives.
While it is apart, I am taking the opportunity to pull the tranny back and lube the clutch splines as well.