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The same thing was happening to my Agility 125 and it turned out to be a loose spark plug wire. Where the connection is from the wire to the spark plug was not tight so the vibrations was causing the spark plug not to fire. I go a new NGK plug and wire and that fixed it for me. At very top throttle at high speed it still might cough at me, but its rare. I just back of the throttle a fraction and its all good from there! Give that a try and see how good the connection is with the threads on the spark plug and the wire.