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Old 12-10-2012, 05:58 PM   #11
disston
ShadeTreeExpert
 
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Joined: Mar 2011
Location: Silver Spring, Md
Oddometer: 8,935
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.
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