Use a long lunge whip and when he kicks out at you spank his butt and make him RUN!! Once he has made a couple of circles around the pen, ask him to slow down, ask him to change directions, then do it all over again. Repeat, repeat, repeat until he gets tired of getting his butt stung and will pick up a nice canter when you ask.
You have got to spank RIGHT when he is kicking, so you need a long whip. And you need to fix it soon, before he actually hurts you.
Good luck with him.
EDIT: Sorry, I'm assuming you have a round pen. If no round pen is available but you have an enclosed area to work in in case he pulls away from you, the same applies, but be prepared in case he takes off. That can be a tough one to deal with on a line.