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I am not sure I have full understanding of your clutch symptoms, but keep in mind that as the engine gets hot in stop and go traffic, the clutch plates, etc. will swell. When I was stuck in traffic once, my clutch would engage as the lever was let out very near the handle bar. After the engine cooled and the clutch cooled, the lever action returned to normal. I do not attribute this to poor clutch fuild as much as I do heat; although keeping fresh fluid in the system is not a bad idea.