All the above is good advice, DRIVE the outside peg into the ground.I pride myself on being good at cornering (or so my friends say) Remember to change direction, you must stop going in the direction your going, like a piston. A piston going at high RPM comes to a complete stop at the top and bottom of every stroke. Work on exicuting (sp) the corner and then building the speed. One of my tricks is to brake extremely hard, and cornering smoothly, then accelerating like crazy. hope this helps a little bit, good luck and let us know how you progress.
Set up two cones or cans two or three gears apart on flat smooth ground and charge at them go around and do it again, repeat.
Practice, Practice, Practice.