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pdlouche
Jung
Generally, if there's a hesitation when you crack the throttle, like the bike falls on it's face and then picks up, that's a lean condition - raise the needle first to see if that makes it better.
Rich bogs tend to be stuttery and more difficult to ride around. Ride along with the choke on to get an idea what they feel like. If it's rich, the plug will be sooty. If it's really rich, anyone riding behind will see a puff of black, every time you whack open the throttle.