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r90/6

  1. C

    1975 r90/6 front wheel bearing

    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...
    • clmedlin
    • Thread
    • loose bearing race r90/6 rebuild
    • Replies: 7
    • Forum: Airheads
  2. B

    R90/6 Piston Ring Thickness Specs

    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...
    • brewer
    • Thread
    • 1974 piston rings r90/6
    • Replies: 18
    • Forum: Airheads
  3. B

    '76 R90/6 - battery recommendation

    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.
  4. T

    1975 R90 gas-tank help!

    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...
    • thomhplatt
    • Thread
    • advice gas tank repair help needed r90/6
    • Replies: 15
    • Forum: Airheads
  5. C

    Valve issue help (video)

    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...
    • chris.poole
    • Thread
    • airhead r90 r90/6 valve adjustment
    • Replies: 51
    • Forum: Airheads
  6. D

    1976 R90/6 parking and speedo/tach lamps out

    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...
    • DSHAR
    • Thread
    • instrument lights out lighting r90/6
    • Replies: 8
    • Forum: Airheads
  7. gr8ridn2

    1976 R90/6 LED Headlight replacement?

    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...
    • gr8ridn2
    • Thread
    • headlight replacement led headlight r90/6
    • Replies: 15
    • Forum: Airheads
  8. T

    Side Car Tires - R90/6 - Jawa

    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...
  9. D

    1976 R90/6 Starter Relay Wiring

    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...
    • Drbillk
    • Thread
    • electrical question r90/6 wiring
    • Replies: 10
    • Forum: Airheads
  10. P

    Timing and points problem 1976 R90/6 not starting.

    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...
    • pszyjka
    • Thread
    • points ignition r90/6 start timing
    • Replies: 15
    • Forum: Airheads
  11. K

    Help, '75 R90/6 stalling out.

    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...
    • kade010101
    • Thread
    • bing 32mm carburator r90/6
    • Replies: 9
    • Forum: Airheads
  12. B

    Customizing a '76 R90/6

    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...
    • banzaibob
    • Thread
    • brakes collector froks r100s r90/6
    • Replies: 16
    • Forum: Airheads
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