Motorcycle Reed Valve Systems
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- Boyesen®RAD Valve Replacement Boot & Clamp Kit (RBK-10)RAD Valve Replacement Boot & Clamp Kit by Boyesen®. This top-grade product is expertly made in compliance with stringent industry standards to offer a fusion of a well-balanced design and high level of craftsmanship. Manufactured from...Advanced design for exceptional performanceProven to deliver long-lasting service life$17.05
- Boyesen®RAD Valve Replacement Boot & Clamp Kit (RBK-1)RAD Valve Replacement Boot & Clamp Kit by Boyesen®. This top-grade product is expertly made in compliance with stringent industry standards to offer a fusion of a well-balanced design and high level of craftsmanship. Manufactured from...Advanced design for exceptional performanceProven to deliver long-lasting service life$17.05
- Boyesen®RAD Valve Replacement Boot & Clamp Kit (RBK-16)RAD Valve Replacement Boot & Clamp Kit by Boyesen®. This top-grade product is expertly made in compliance with stringent industry standards to offer a fusion of a well-balanced design and high level of craftsmanship. Manufactured from...Advanced design for exceptional performanceProven to deliver long-lasting service life$17.05
- Boyesen®RAD Valve Replacement Boot & Clamp Kit (RBK-17)RAD Valve Replacement Boot & Clamp Kit by Boyesen®. This top-grade product is expertly made in compliance with stringent industry standards to offer a fusion of a well-balanced design and high level of craftsmanship. Manufactured from...Advanced design for exceptional performanceProven to deliver long-lasting service life$17.05
- Boyesen®RAD Valve Replacement Boot & Clamp Kit (RBK-8)RAD Valve Replacement Boot & Clamp Kit by Boyesen®. This top-grade product is expertly made in compliance with stringent industry standards to offer a fusion of a well-balanced design and high level of craftsmanship. Manufactured from...Advanced design for exceptional performanceProven to deliver long-lasting service life$8.96
- Boyesen®RAD Valve Replacement Boot & Clamp Kit (RBK-5)RAD Valve Replacement Boot & Clamp Kit by Boyesen®. This top-grade product is expertly made in compliance with stringent industry standards to offer a fusion of a well-balanced design and high level of craftsmanship. Manufactured from...Advanced design for exceptional performanceProven to deliver long-lasting service life$8.96
- Boyesen®RAD Valve Replacement Boot & Clamp Kit (RBK-4)RAD Valve Replacement Boot & Clamp Kit by Boyesen®. This top-grade product is expertly made in compliance with stringent industry standards to offer a fusion of a well-balanced design and high level of craftsmanship. Manufactured from...Advanced design for exceptional performanceProven to deliver long-lasting service life$17.05
- Boyesen®RAD Valve Replacement Clamps (RV-HC)RAD Valve Replacement Clamps by Boyesen®. Includes 2 band style clamps. Carbon Tech reeds are the easiest, most cost efficient modification you can make. Carbon Tech have seen up to 4 horsepower increases just by using Carbon Tech...Advanced design for exceptional performanceProven to deliver long-lasting service life$11.65
- Boyesen®RAD Valve Replacement Gasket (RG-03)RAD Valve Replacement Gasket by Boyesen®. This top-grade product is expertly made in compliance with stringent industry standards to offer a fusion of a well-balanced design and high level of craftsmanship. Manufactured from...Advanced design for exceptional performanceProven to deliver long-lasting service life$5.36
- Boyesen®RAD Valve Replacement Gasket (RG-25)RAD Valve Replacement Gasket by Boyesen®. This top-grade product is expertly made in compliance with stringent industry standards to offer a fusion of a well-balanced design and high level of craftsmanship. Manufactured from...Advanced design for exceptional performanceProven to deliver long-lasting service life$5.36
- Boyesen®RAD Valve Replacement Gasket (RG-42)RAD Valve Replacement Gasket by Boyesen®. This top-grade product is expertly made in compliance with stringent industry standards to offer a fusion of a well-balanced design and high level of craftsmanship. Manufactured from...Advanced design for exceptional performanceProven to deliver long-lasting service life$5.36
- Boyesen®RAD Valve Replacement Gasket (RG-15)RAD Valve Replacement Gasket by Boyesen®. This top-grade product is expertly made in compliance with stringent industry standards to offer a fusion of a well-balanced design and high level of craftsmanship. Manufactured from...Advanced design for exceptional performanceProven to deliver long-lasting service life$5.36
- Boyesen®RAD Valve Replacement Gasket (RG-02)RAD Valve Replacement Gasket by Boyesen®. This top-grade product is expertly made in compliance with stringent industry standards to offer a fusion of a well-balanced design and high level of craftsmanship. Manufactured from...Advanced design for exceptional performanceProven to deliver long-lasting service life$5.36
- Boyesen®RAD Valve Replacement Gasket (RG-42A)RAD Valve Replacement Gasket by Boyesen®. This top-grade product is expertly made in compliance with stringent industry standards to offer a fusion of a well-balanced design and high level of craftsmanship. Manufactured from...Advanced design for exceptional performanceProven to deliver long-lasting service life$5.36
- Boyesen®RAD Valve Replacement Gasket (RG-12)RAD Valve Replacement Gasket by Boyesen®. This top-grade product is expertly made in compliance with stringent industry standards to offer a fusion of a well-balanced design and high level of craftsmanship. Manufactured from...Advanced design for exceptional performanceProven to deliver long-lasting service life$5.36
- Boyesen®RAD Valve Replacement Gasket (RG-43)RAD Valve Replacement Gasket by Boyesen®. This top-grade product is expertly made in compliance with stringent industry standards to offer a fusion of a well-balanced design and high level of craftsmanship. Manufactured from...Advanced design for exceptional performanceProven to deliver long-lasting service life$5.36
- Boyesen®RAD Valve Replacement Gasket (RG-40)RAD Valve Replacement Gasket by Boyesen®. This top-grade product is expertly made in compliance with stringent industry standards to offer a fusion of a well-balanced design and high level of craftsmanship. Manufactured from...Advanced design for exceptional performanceProven to deliver long-lasting service life$5.36
- Boyesen®RAD Valve Replacement Gasket (RG-31)RAD Valve Replacement Gasket by Boyesen®. This top-grade product is expertly made in compliance with stringent industry standards to offer a fusion of a well-balanced design and high level of craftsmanship. Manufactured from...Advanced design for exceptional performanceProven to deliver long-lasting service life$5.36
- Boyesen®RAD Valve Replacement Gasket (RG-02A)RAD Valve Replacement Gasket by Boyesen®. This top-grade product is expertly made in compliance with stringent industry standards to offer a fusion of a well-balanced design and high level of craftsmanship. Manufactured from...Advanced design for exceptional performanceProven to deliver long-lasting service life$5.36
- Boyesen®RAD Valve Replacement Gasket (RG-01A)RAD Valve Replacement Gasket by Boyesen®. This top-grade product is expertly made in compliance with stringent industry standards to offer a fusion of a well-balanced design and high level of craftsmanship. Manufactured from...Advanced design for exceptional performanceProven to deliver long-lasting service life$5.36
- Boyesen®RAD Valve Replacement Gasket (RG-10)RAD Valve Replacement Gasket by Boyesen®. This top-grade product is expertly made in compliance with stringent industry standards to offer a fusion of a well-balanced design and high level of craftsmanship. Manufactured from...Advanced design for exceptional performanceProven to deliver long-lasting service life$5.36
- Boyesen®RAD Valve Replacement Gasket (RG-24)RAD Valve Replacement Gasket by Boyesen®. This top-grade product is expertly made in compliance with stringent industry standards to offer a fusion of a well-balanced design and high level of craftsmanship. Manufactured from...Advanced design for exceptional performanceProven to deliver long-lasting service life$5.36
- Boyesen®RAD Valve Replacement Gasket (RG-21)RAD Valve Replacement Gasket by Boyesen®. This top-grade product is expertly made in compliance with stringent industry standards to offer a fusion of a well-balanced design and high level of craftsmanship. Manufactured from...Advanced design for exceptional performanceProven to deliver long-lasting service life$5.36
- Boyesen®RAD Valve Replacement Reeds (RL-07)RAD Valve Replacement Reeds by Boyesen®. Replacement Pro Series Reeds for Boyesen RAD Valves. Includes petals, rev-plates and extra screws. This top-grade product is expertly made in compliance with stringent industry standards to offer...Advanced design for exceptional performanceProven to deliver long-lasting service life$30.22
- Boyesen®RC2 Series RAD Valve (RAD-42E)RC2 Series RAD Valve by Boyesen®. The Rad Valve's seamless, one-piece, precision casting and continuous aero-form surfacing provide maximum flow velocities and instant, explosive movement of air particles the moment you turn the...Boyesen Engineering would like to introduce the all-new RC2 Series Rad Valve, designed to increase overall horsepower and throttle responseEach Boyesen RAD Valve is unique - tailor made to that model, year and displacement$153.80
- Boyesen®RC2 Series RAD Valve (RAD-46)RC2 Series RAD Valve by Boyesen®. Patented, one piece, cast aluminum Reed Block system that delivers guaranteed bolt on performance. Carb boot, Carb boot clamp and gasket provided. No modifications required. An aero-form reed valve that...Boyesen Pro Series RAD Reeds includedAdvanced design for exceptional performance$145.25
- Boyesen®Replacement Power Reed Kit for RAD Valve (RL-21)Replacement Power Reed Kit for RAD Valve by Boyesen®. Includes petals, rev-plates and extra screws. This top-grade product is expertly made in compliance with stringent industry standards to offer a fusion of a well-balanced design and...Advanced design for exceptional performanceProven to deliver long-lasting service life$37.59
- Boyesen®Replacement Power Reed Kit for RAD Valve (RL-20)Replacement Power Reed Kit for RAD Valve by Boyesen®. Includes petals, rev-plates and extra screws. This top-grade product is expertly made in compliance with stringent industry standards to offer a fusion of a well-balanced design and...Advanced design for exceptional performanceProven to deliver long-lasting service life$37.59
- Boyesen®Replacement Power Reed Kit for RAD Valve (RL-12)Replacement Power Reed Kit for RAD Valve by Boyesen®. Includes petals, rev-plates and extra screws. This top-grade product is expertly made in compliance with stringent industry standards to offer a fusion of a well-balanced design and...Advanced design for exceptional performanceProven to deliver long-lasting service life$40.86
- Boyesen®Replacement Power Reed Kit for RAD Valve (RL-08)Replacement Power Reed Kit for RAD Valve by Boyesen®. Includes petals, rev-plates and extra screws. This top-grade product is expertly made in compliance with stringent industry standards to offer a fusion of a well-balanced design and...Advanced design for exceptional performanceProven to deliver long-lasting service life$40.86
In a two-stroke engine, the piston works like a pump sucking the fresh air-fuel mixture into the crankcase. Does the motor really need a check valve in the air intake? Of course, it can work perfectly well using just a plain piston-port system, but the valve allows for increasing engine performance. There are two main kinds of such devices – the rotary disc valves, which were popular in the 60s, and the reed ones. The former are much more complex, more expensive, and less reliable. The latter are simpler and good enough for most applications including motocross.
Installed between the engine and carburetor, or even bolted directly to the crankcase, the reed valve prevents some part of the mixture from going back to the intake thus ensuring more power. Typically, it's composed of two or more flexible petals mounted onto a wedge-shaped cage. When the piston creates a low-pressure zone in the crankcase, these petals open to let the mixture inside the engine. The number, material, and size of these parts can differ in various models, but the main principle remains the same. However, there are some traits peculiar to each model, and they influence the valve's lifespan and its efficiency at low or high RPM.
The cage's design can also vary influencing performance. In general, its volume has to be approximately the same as the volume of the crankcase and carburetor in order not to create restrictions to the flow. There can be multiple shorter petals or one large petal laying over another one, like in a dual-stage system by Boyesen; such solutions are meant for better throttle response and higher torque throughout the powerband. Our online store offers reed valves, rebuild kits, gaskets, boots, and related components made by Moto Tassinari, Boyesen, and other reliable companies that dominate the market these days. We carry both carbon fiber and fiberglass reeds featuring sufficiently light weight and durability to meet the highest expectations.