re: Are you sure your sitting on the bike right.....
Don't know powercart...but don't assume he's just trying to be funny.
It would go like this: Jam the brake (rear presumed). Push the bike down on the right. Move your body to the left. Countersteer effect of turning the bars to the left is a dive to the right. Yeah the body shift and countersteer effect would offset. Still, if you're moving your self thru pedal pressure you need to change your technique.
Or...Are you sure you're sitting on the bike right?
The kicker may be goobered in a number of ways. If it's loose (if it's a stock kicker more than 10 minutes old, it probably is), and moves freely to the tucked position but doesn't stay there, try the allen adjustment limit said.
If it's tight and does not move freely to the tucked position, it may be full of crud, hanging up on o-ring pieces inside or a non-maintained kicker may be galled.
It's a good idea to keep it clean and lubricated. The snap ring has the spring tension of a piece of solder. Be careful when removing it. Back off the allen screw, remove the kicker from the knuckle, clean it up and grease it. Put on new o-rings. Put it back together.
Keep in mind that with the allen backed out to relieve pressure on the check ball when you actually take the kicker OFF..the check ball will likely fall out and roll to someplace as yet unexplored by mankind.
The spring has the same tension characteristics as the snap ring. You will do yourself a favor by going to your local hardware store to get a decent spring.