Definetly no battery on a KDX. Grab a new plug put it in the boot and hold it against the cylinder head to make sure you are getting spark. Drain the gas out of it, if there is water in the gas it sinks to the bottom and it will never start. Make sure th petcock is working right, if it seems like it is flooded, hold the gas wide open and keep kicking it till it starts. My KX 500 would occasionally be a pain in the ass to start. Snapped two kick starters on that bitch, way too much compression...
