Kit includes necessary all O-rings, gaskets, jets, needle, mixture screw, float bowl screws, float valve needle and seat. (Needle jet and other pressed in jets are not included in kit.) Off road use only Components included in the kits are based off of US models and discretion may be used when attempting to install the kit on a non US model. NBR rubber material is used on all O-rings and rubber gaskets NBR has excellent resistance to the ethanol used in todays fuels.