Using your K&N replacement air filter is easy. Just remove the old air filter from your 1987 - 2006 Yamaha YFZ350 Banshee and put the new K&N filter in its place. It's that simple! When it comes to maintenance, check the filter regularly, especially after riding in really dirty or dusty conditions. If it looks dirty, it's time to clean it. You can wash the filter with a mild cleaner and water, then let it dry completely before putting it back in. Remember, this filter is reusable, so you don't have to keep buying new ones. As for precautions, always make sure the filter is properly installed to get the best performance. Also, don't use any harsh chemicals when cleaning the filter as it might damage it.