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Carbon fiber reeds are lightweight but relatively stiff (higher spring tension)
and designed to resist fluttering at high RPM. Fiberglass reeds are good for
low- to mid-range power and carbon fiber reeds are better for high RPM performance.
The Polini carbon fiber reed set comes four in the package - a pair of thinner ones (blue), and a thicker pair (green
or unmarked). You can adjust the performance of the motor by using different
combinations of these differing thickness reeds, observing that even among the carbon reeds the thinner ones (lower spring
tension) will give you better low-end and the thicker ones (higher spring tension) better high RPM performance
Pocket Bikes Engine Cranks
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The reed(s) on a reed valve induction engine function essentially as a one-way
doggie-door, admitting air when the motor is drawing air/fuel mixture, and closing when crankcase compression (known as "pre-charge")
begins.
There are two types of reed petal materials commonly used,
fiberglass and carbon fiber. Fiberglass reeds have relatively low spring tension, so they instantly respond to pressure changes
in the crankcase (known as "signal"). The low spring tension can allow them to
flutter at high RPM thereby limiting the amount of power.
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