Recalibrate your stock Constant Velocity carburetor to make the most out of the air cleaner, exhaust and cam changes or head work. Kit contains a #5 MAHR needle, 08 B00 jet holder, #45, #48, #50 slow jets, #190, #195, #200 and #205 main jets. Includes suggested jetting guidelines. Made in the USA. Fits all HD CV carbs. (A10)