The one thing I have always done is to kill it with the bike in gear and the clutch in. Then-and this is the important part-don't let the clutch out again until you kick it, it fires, and you are ready to take off. It is my understanding that this keeps a certain amount of fluid between the clutch plates. Releasing the lever squeezes this fluid out, causeing more drag on the clutch, which tends to want to make the bike move forward when in gear and kicking it over. There will still be a slight amount of pull from the motor, but a decently strong kick should over come it, and he will be motoring off almost immediately after it fires. Practice this as many times as you can with him. Also have him start it (but don't take off!) when the lines in front of him start and take off. He doesn't have to do it with every line of riders, but just enough to keep the engine warm, and to keep him in practice. Good luck!