You might want to change your code to:

on *:text:!kon *:#: { 
  if ($nick isop $chan && $$2 ison $chan) {
    set %kick $2 
    msg $chan $2 next time you get talk you will be kicked 
  }
}

Hence the space between !kon and the *, and the $$2. This makes sure $2, the nickname, is set and that it is in your channel.

You should also combine those three text events.