Fuel:air mixture

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A fuel/air mixture is what enters the cylinder in a moped's engine and is ignited by a spark plug during operation. Sometimes a moped will not run optimally if this mixture is too rich (too much fuel) or too lean (too little fuel). The mixture can be made richer at wide open throttle by upjetting or restricting airflow. The fuel/air mixture at other throttle positions can be changed via needle adjustment.