Boyesen Power Reeds 333R Yamaha Yamaha 90 replacement O-Ring Kit

Yamaha 90 replacement O-Ring Kit

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This Kit Fits our TSR 1989-2001 CR500 Billet Cases & our 2021- 2024 CR500 Billet Direct Drop in Kit

15mm swing arm bush variant is to suit to suit stock KX500

sold as individual domes

Boyesen Power Reeds 333R Yamaha Yamaha 90 replacement O-Ring KitDual stage reeds work in unison to perform efficiently throughout the entire powerband. The difference in stiffness between the top reed and the bottom reed allow the reeds to respond quickly and accurately to changes in engine pressure. This translates into quicker acceleration, crisper throttle response and increased horsepower throughout the powerband. Important Note: Complete Set 3 Cylinder Engine. Racing reeds for engines running over 7,000 7,500