Kits are intended for closed course racing only.NBR rubber material is used on all O-rings and rubber gaskets..NBR has excellent resistance to the ethanol used in todays fuels.Components included in the kits are based off of US models and discretion must be used when attempting to install the kit on a non US model.All gaskets and O-rings including intake gaskets before and after the carburetor.Float bowl, carburetor cap, and accelerator pump screws.Extended fuel mixture screw with spring, washer, and O-ring.Float needle valve with FMK tip.Accelerator pump diaphragm spring and boot.Emulsion tube with slide needle.3 main jets and 3 pilot jets that can be used to tune a stock machine or a modified one