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AIR CUT OFF VALVES PREVENT "AFTER BURN" GENERATED WHEN THE THROTTLE IS SUDDENLY CLOSED WHEN THE THROTTLE IS SUDDENLY CLOSED, THE VALVE TEMPORARILY CLOSES THE SLOW-JET PASSAGEWAY---CREATING AN INSTANTLY RICHER MIXTURE AND THUS REDUCES "POP" SOUNDS UPON DE-ACCELERATION

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Q: What does a motorcycle air cut off valve do?
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