Twin Power 422632 CV Carburetor Recalibration Kit with Gaskets and Seals for Big Twin and XL

The Twin Power 422632 CV Carburetor Recalibration Kit is designed to optimize the tuning of the Keihin constant velocity (CV) carburetor found on 1990–2006 Harley-Davidson Big Twin and Sportster (XL) models. This is the complete version of the kit, including gaskets and seals for a thorough service.

Common CV carb issues like throttle flat spots, backfiring, and sluggish throttle response are directly addressed by this recalibration kit. It delivers improved power in the midrange and top end while preserving acceptable fuel economy — making it an ideal upgrade for riders who have added performance modifications or simply want to restore crisp carburetor response.

Kit Includes:

• Main jet assortment for precision tuning — sizes 150, 160, 170, 180, and 190
• Gaskets and seals for a complete service
• Installation and tuning instructions

Key Features:

• Cures throttle flat spots, backfiring, and poor throttle response common to CV carburetors
• Increases midrange and top-end power output
• Maintains satisfactory fuel economy after recalibration
• Brass jets engineered for high-precision, flow-calibrated fuel delivery
• Includes step-by-step instructions for correct installation and jetting selection

Twin Power has specialized in V-Twin motorcycle parts and accessories since 1983, making them a trusted name in Harley-Davidson aftermarket performance components.