In this tutorial, we learn how to change your air filter on a 2008 Ninja motorcycle. You will need: a number 5 Allen wrench, a screwdriver, and a new air filter. First, take the side cover off your bike with your screwdriver. After you remove this, set it down to the side as well as everything else that comes with it. Now, remove the air cover from the filter and set the screws to the side. Next, find your air filter and remove it from it's space. After this, replace the old filter with the brand new one. To finish, replace all the parts you took off in the reverse order. After this, your bike will run more efficiently!