Carb Rebuild KitKits include all of the necessary components to repair/rebuild a carburettor.NBR rubber material is used on all O-rings and rubber gaskets NBR has excellent resistance to the ethanol used in today’s fuels.OEM jet sizes are included in the kit and kits are based off of U.S. models and discretion should be used when installing kit on non U.S. model.Models with multiple carburetors include components to repair each carburetors.