Old gas blocking up the pilot jet is a common problem, and the only fix is to remove the jet and clean it. Any blockage here, and you’ll have difficulty idling. Your Pilot Jet is responsible for supplying the gas at idle. Now reduce the idle screw (not air-fuel mix screw) to where the engine idle is smooth, anywhere from 1000- 1500 rpm.Within that window of both stalls, set the screw where the revs are at their highest.Restart, idle the engine and turn the screw (clockwise this time) until it stumbles and stalls.Keep turning until it stumbles and stalls.Start the engine and have a helper balance the throttle while you turn the mix screw anti-clockwise until the engine runs by itself.Return the screw to its original setting.Turn the engine off, find your base setting by turning the pilot screw (mix screw) all the way home (clockwise) until it seats, counting the number of turns (about two is normal).
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