This is a needle shim kit for fine tuning your Mikuni Round and Flatslide Carbs. These fit most Ski-doo, Arctic-Cat, Polaris , and Yamaha carbs from 1993-2017.
Included are 2-.020"shims, and 4- .010" shims. This gives you the ability to shim non adjustable needles from .010" to 040" or fine tune adjustable needles by .010" or .020" increments between the oem (.030") needle clip increments. No pilot jets are included in this kit.