Re: 1987 15hp johnson rewind starter
When I re-install them, I remove the air silencer and turn the unit until the starter is right up against the front of the motor where the rope exits the motor. I then hold the unit tight and pull on the pully (creating tension) to bring it back to where it mounts on the motor. This amount of tension should ensure the rope handle ends up tight against the motor and as you pull it for starting, more tension is created to ensure a good rewind.
If this doesn't work then ensure the outer end of the spring is still sticking out of the groove in the cup. If that spring end goes through the groove, into the cup, it will not work.