Boyesen Motorcycle valve box Rad Yamaha YZ85

The engineers Boyesen have developed a series of technical innovations for their intake systems to optimise power, torque, and flexibility: Aerodynamic Surface Optimization (optimisation of internal surfaces), Model-Specific Reed Petal Tensioning (model-specific reed petals), Material Fuel Resistance (fuel-resistant materials), and Multi-Stage Reed Timing (staged opening reeds).
The reed valves BOYESEN are specifically developed for each motorcycle model.

• 100% aluminium reed valve body with optimised internal surface
• 4-way diffuser to optimise flow and prevent pressure loss
• Intake pipe and mounting clamps included, direct fit without modification
• Variable flexibility reeds, specific to each model (in aerospace-grade carbon)
• Rubber-coated and hydrocarbon-resistant reeds ensuring prolonged seal life

The RC2 reed valves, developed for competition, significantly optimise intake flow, leading to more efficiency, increased power, and better revs on YOUR motorcycle!

Specifications:

• weight (g): 292
• width (mm): 111
• height (mm): 111
• length (mm): 145
• volume (cm³): 1787