r90/6

I am rebuilding a r90/6. I bought the bike as a barn find project. As I went to rebuild the front hub, one of the outter races fell out when I pulled the bearing. As I went to install the new outter races, one side pressed in as expected. On the side which came out with the bearing, the outer...

I am in the middle a top end and cylinder base overhaul of my R90/6. While looking up specs to check for piston ring wear limits (as in gap between the rings and the ring groove in the piston) I have come up with a bit of a surprise. I have several sources which I have crossed checked for the...

New rider - current battery in the bike is a Yuasa 12V that seems a bit small for the battery tray. Looking for a recommendation for new one.

Hey folks, First of all, this is my first time posting on here - I just joined the BMW MOA and I'm very happy to be here! I bought my 1975 R90/6 back in November, and now that it's slowly starting to warm up in Canada I'm starting to get some work done to get her ready for spring. The first...

Valve issue help (video) UPDATE Hi guys, I took my R90/6 out for about 60mi this morning for the first time in a month or so and it ran/sounded great. When I got back home, I had it idling in the garage and heard a loud SNAP and then clank clank clank clank, as the engine continued to run for...

Hello! I finally have a tech question to pose to the experts... The parking lamp and speedo/tach lamps on my 1976 R90/6 suddenly stopped working. The center lamps (oil, gen, etc) work normally, but I get no lighting in the dials and no parking lamp regardless of the key or light switch position...

As I see this bike uses a H4 halogen bulb. Being spoiled by the newer bikes one of which has the factory LED headlight I am considering a headlight LED bulb with the R90. The benefits are primarily safety. There is no doubt you are seen better during the day with a bright headlight. I feel a...

Hello! After fixing login issues... this is my first post. :-) I have a couple of airheads and recently acquired a 1974 R90/6 with a side car setup by Jawa. Its a nice rig but I don't have a good place to store it other than outside with covers. So my plan is to fix a few small things and...

I am in the middle of restoring my R90/6 and took LOTS of pictures before teardown. Unfortunately, the only pics I have of the wiring for my starter relay are blurry and un-usable. Now I'm stuck. In the Haynes manual it shows 5 connectors with 9 wires, in the Clymer manual it shows 5 connectors...

I recently replaced my points on my r90/6 and can't seem to advance the timing enough to get the bike to fire up. While using the alligator clip to light bulb method to set the timing initially I can only turn the plate enough to turn the bulb on about 3 cm from the S marks and on the other end...

I'm stuck with this '75 R90/6. This is what's wrong: It starts fine, and when I have the rear wheel jacked up the bike goes through its gears smooth and easy. When I get on it for a ride it will stall unless I give it near full throttle but when I get into 2nd and 3rd the 'stalling' becomes...

Hello, new member here. I have a '76 R90/6 that I am for the most part, happy with. I has about a bazillion miles (dead odometer/speedo). I also have a non running '77 R100S that is locked up, missing parts and in general, a parts bike. Question is: I would like to put the front forks...