BOYESEN Pro Series Reed for RAD21D PSR105

A reed valve is your engine's gatekeeper—it controls the precise timing of fuel and air mixture entering the combustion chamber, directly impacting throttle response and power delivery. The Boyesen Pro Series PSR105 combines carbon fiber technology with a proven dual-stage design to give you faster acceleration, sharper throttle control, and measurably improved horsepower and torque without the accelerated wear that plagues traditional carbon fiber reeds. If you're serious about maximizing performance on the track or trail, this is the upgrade that separates competitive builds from the rest.

• Dual-stage reed design
• Carbon fiber top reed
• Fiberglass/epoxy bottom reed
• Responds to piston speed
• Quick throttle response
• Extended reed life
• Increased horsepower output
• Increased torque output
• Fits RAD21D carburetor
• MPN: PSR105
• Bolt-on installation