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Old 12-10-2012, 06:29 PM   #12
Captdan OP
Gnarly Adventurer
Joined: Jan 2012
Oddometer: 206
Originally Posted by disston View Post
As mentioned earlier. The Bing carbs all have a different start position on the mix screw. From this position the bike can be riden enough to warm up and then a final adjustment of the carbs performed. Also mentioned earlier the tune up should include a valve adjustment first, then points dwell and timing (new plugs often are helpful. Then the carbs can be adjusted.

Those carbs are the stock crabs for all R90/6 machines. The start setting for the mixture screw is One (1) full turn out. BTW this is a fuel adjustment, not an air adjustment like in many carbs. Counter clockwise is richer.

Thanks for the notes. I'm awaiting delivy of the points and condenser. Did the valves tonight ( were a bit tight). Also obtained coils, plug wires, and new spark plugs. This weekend I'll install all the new parts and see if I can get it back to running like it was. ( also ordered a new nutral switch and will install it too due to leaks). Another few years of r90/6 ownership and I may know something about working on one. :)

Ps: yes, have an old shop manual that came with the bike.
1965 Cushman super silver eagle, 1968 BMW R-60/2, 1974 R-90/6 cafe, 2008 R-1200 GSA.
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