Boyesen Reeds GasGas Pro Keihin Pro SeriesA POWERFUL SOLUTION TO A SIMPLE PROBLEM One reed petal is NOT enough! The reed petals in all 2 stroke machines take an incredible amount of abuse! At peak RPM, reed petals are opening and closing hundreds of times per second. Over time, a single reed loses its ability to regulate flow rates in proper proportions. This causes a loss of reed petal reaction and reduces the consistency of peak horsepower. Boyesen's revolutionary dual stage reed design