How you move your bike? by clicking?
you can reproduce movements without any behavior, by just updating their own X and Y.
If so, just make a instance variable for the player bike and then check how click by second the user is doing. Add it to a math to multiply the mouse count by the dt and divided by the time_count (you can use the time_count of the canvas or make another instance variable, where will be updated every second, for example).
You can make it by many ways.
If you still needing help, and I think you'll earn something with it, please, read this talk: http://www.scirra.com/tutorials/361/understanding-uid-iid-health-of-enemies-and-rocket-smoke-trail
Plus, if you still needing help, place a CAPX with the minimal code and objects here and We can make the deal for you.TELLES08082012-09-05 17:15:03