The OEM Air Filter is used to stop debris and particles from entering the carburetor and engine, which could cause damage. It is attached in the air filter housing. It comes in black, and is contructed from foam. Installation is rated as "Easy" by customers, and will require a screwdriver. (Tip: You can place the filter in a plastic bag w...Read moreith a bit of oil, remove it, and then squeeze the filter to drain the excess oil. The remaining oil will work as a sticky trap). If the part becomes worn over time, the engine will be hard to start and will run rich. In this case, replace the part. Refer to your make, model and diagram to ensure this is the correct part for you.