Using this Rocket Sprocket Mini Sprocket Hub is easy. First, make sure your kart's axle is 50mm in size. Then, carefully fit the sprocket onto the axle, aligning the 8mm wide keyway slot properly. As for maintenance, keep the sprocket clean and check for any signs of wear regularly. If you notice any issues, it's best to replace the sprocket to ensure your kart runs smoothly. When handling the sprocket, be gentle to avoid any damage.