How do you change the oil on a 1997 Yamaha Kodiak 400 4X4?

The drain plug in located at the bottom of the crankcase. only accesable from under the skid plate. The skid plate does not need to be removed. CAREFULL there is a spring that is on top of the drain plug that will force the plug to eject toward you . The Oil filter is located on the bottem rear area on the left side of the quad under a cover with 2 hoses attached, again there is a spring behing the filter that will push toward you. Exchanging the filter is very easy and strait forward.