Kick return stoppers often lose their rubber lining or it wears to the point where your gears no longer line up and the kick start lever won’t catch and return like it should. I’m working on finding a solution to reline the rubber. I thought of a glue and screw method or relining it like others reline their clutch shoes.
The part can only be found used and is very difficult to locate. Another solution would be to by a parts bike and hope the stopper was in good shape.