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Big thanks to everyone for the insights, although you've confirmed my worst fears! this bike is a Bitsa. The current owner told me yesterday that the previous owner got it from a junk yard. No doubt the PO likely tried to "fix it up". The engine and frame are definitely 90/6 (based on seri...

Sorry, the image didn't get posted with the topic.

Another couple of dumb questions. I'm helping a buddy with a1974 90/6, and going through all the electrics to verify operation The ignition switch key befuddles me ! When I press the key into the hole, an indicator in the tach lights up (see photo) So first, question, what is this indicator telling ...

Thank you. I won't mess with it

Quick (and probably dumb) question . What is this black box with a red top under the tank of a 1974 R90/6.
Looks like something electric, but I don' want to start prying/pulling to take a look.

This isn’t a question. Instead it is an examination of the BMW starter relay used on many air-heads, I hope it will save someone from the same head-scratching I went through. This is all based on a 1974 90/6, which I repaired after the starter stopped running due to a failed starter relay. Other mod...

Thanks! together with the others I've found, that will help confirm As to why, I'm replacing the starter relay, The electrical engineer in me wants to understand why there are all these wires not related to the starter button, or relay operation, connected to the relay. (Like the one running to the ...

I'm working on a friend's 1974 90/6. I have the Clymer "500-1000cc twins" book. It has a schematic for a 1974 R90s. It might be the same for a 90/6, but I'm not sure. I've looked on the internet for a wiring diagram and found some, but they all are all different. Anyone have a source they ...

I just saw a 1971 R50/5 on BAT, that has this same ignition switch. I also rechecked the frame tag and it reads "R90/6" Perhaps someone grafted a /5 headlight shell onto this bike, but that would require huge amount of rewiring. Looks "factory" Another mystery

I'm working on electrical issues on a friends' 1974 R90/6 (that is what the frame tag confirms.) First thing I couldn't find is the ignition switch! What I find is 2"-long rod with a plastic handle on top that fits into a hole under a sliding plastic cover, mounted to the top of the headlight s...