Our damper unit is designed to protect gear teeth & sprag clutch on supercharger drive system. Dampener features innovative cushioning mechanism that insulates gears from harsh clutch engagement. Directly replaces OEM intermediate gear located between clutch and supercharger shaft. Constructed with superior materials and thicker gear teeth than OEM. Designed to be used with RIVA Supercharger Shaft Upgrade kits. Key Features Include: Dampener mechanism protects supercharger drive gears. Improves sprag clutch durability. Stronger materials and thicker gear teeth than OEM. Directly replaces OEM intermediate gear. No auxiliary clutch systems or maintenance required. Superior bearing material & thickness. Use with RIVA Supercharger Shaft Upgrade Kit. Manufactured exclusively for RIVA Racing by HKS.APPLICATION GUIDE: RY17040-SGD-6S5: `09~12 FZR up to Primary ID # F2R806400 `09~12 FZS up to Primary ID # F2C808500 `08~12 FX SHO up to Primary ID # F2S803100 Compatible with 60 tooth Yamaha clutch part# 6S5-17800-10-00. RY17040-SGD-6S5-20: `12 & Newer FZR starting with Primary ID # F2R806401 `12 & Newer FZS starting with Primary ID # F2C808501 `12 & Newer FX SHO starting with Primary ID # F2S803101 Compatible with 57 tooth Yamaha clutch part# 6S5-17800-20-00.
