i have a 2005 rancher,its runs fine,but has a chattering coming from the cylinder area.i've heard that it might need a valve adjustment.im handy with cars but havent worked on ATVs much.does anyone have any ideas where i might get started

 

If you buy a service manual, it will describe what needs to be done. Here is an online article on valve adjustment, which should give you a good idea if you want to do it or not. Should be a piece of cake. It usually takes longer to remove the plastic, than it doea to do the check and adjustment.
http://www.motorcyclecruiser.c..._adjustment/index.html