Twin Power CV Recalibration Kit With Seals And Gaskets For Harley Optimize the tuning on your CV carb for performance modifications. Recalibration kit cures throttle flat spots, backfiring and poor throttle response common to the CV carbs. Increases power midrange and top end while maintaining satisfactory fuel economy. Features Main jet assortment for precision timing includes: 150, 160, 170, 180 and 190 Includes gaskets and seals Instructions for installation and tuning included