Using these AS3 Performance silicone radiator hoses on your 2003 - 2008 Kawasaki KX 125 is easy. Just make sure to match them with the right radiator connections. When installing, be gentle to avoid any accidental damage. These hoses are for off - road and track use only, so never use them on public roads. As for maintenance, regularly check the hoses for any signs of wear or damage, like cracks or leaks. If you notice anything wrong, it's best to replace the hose right away. Also, keep them clean by using a mild soap and water. Remember, these hoses come with a 12 - month warranty from the date of purchase, so if you have any issues within that time, reach out to us.