Using this nylon pre - filter is easy. First, make sure you have the carb intake air filter (sold separately). Then, simply place the pre - filter over the top of the air filter. It should fit snugly. As for maintenance, check the pre - filter regularly. If it looks dirty or clogged with debris, you can wash it gently with mild soap and water. Let it dry completely before putting it back on. One important thing to note is that this pre - filter is an accessory and you need to have the main carb intake air filter already. Also, don't force it onto the air filter as it may damage either the pre - filter or the air filter.