Twin Power 90-06 Big Twin and XL CV Carburetor Recalibration Kit

Our recalibration kit cures throttle flat spots, backfiring and poor throttle response common to the CV carbs. It increases power midrange and top end while maintaining satisfactory fuel economy.

Includes instructions for installation and tuning|Main jet assortment for precision timing includes: 150, 160, 170, 180 and 190|P/N 422632 includes gaskets and seals