In this tutorial, we learn how to replace the spark plugs on a 2008 Kawasaki Ninja 250. First look underneath your bike to find out exactly where the spark plugs are at. Next, use wrenches and ratchets to loosen the parts around the spark plugs, then remove the spark plugs completely. After you have pulled them out, replace them with the new one and secure them into place. When finished, replace all the casing around the plugs and make sure you secure them tightly. Add on all bolts when you are finished as well, so everything stays in place. When finished, you will have new spark plugs to help your bike run better!