The kick starter catch is two pieces separated by a light spring that is supposed to collapse when you kick the lever. Either the spring is sticking, or maybe the teeth on the catch are rounded or damaged in some other way. Take the side cover off and isnpect the kick starter, the problem should be visible. As for the throttle, if the throttle moves and the slide does not, either the cable sheath is not anchored properly, there is too much slack in the cable, or the cable is broken. If the throttle is stuck, do what MWKE said.