Using your K&N replacement air filter is easy. First, turn off your motorcycle and let the engine cool down. Then, locate the air filter housing on your Kawasaki KVF750 Brute Force. Open the housing and carefully remove the old air filter. Place the new K&N filter in the housing, making sure it fits snugly. Close the housing and you're good to go. When it comes to maintenance, it's a good idea to check the filter regularly, especially if you ride in dusty or dirty conditions. You can clean the filter using a K&N filter cleaning kit. Follow the instructions on the kit for best results. Always make sure the filter is completely dry before reinstalling it. Also, don't forget to lubricate the filter after cleaning. This helps it trap dirt and debris effectively. Lastly, if you have any questions or need more detailed help, don't hesitate to contact K&N's customer support.