These complete CV carb recalibration kits contain all the same parts as the intake performance kits except the K & N filters. For use with a modified stock airbox or K & N clamp-on filter already installed. These kits are designed to work only with K & N clamp-on or K & N replacement elements. Use of the kit with stock filters will not increase performance.

Professional Installation is Recommended.

Yamaha YSR50 K&N Intake Recalibration Kit - Stage 3 - 81-9143 Fits:

1987-1992 Yamaha YSR50