Re: 15 HP Evinrude pull start
What year? Could be a broken spring or it could be your spring has slipped inside the cup. It could be just gummed up as well. Try soaking the spring area with WD40 spray and see if it loosens up. You should get an OMC service manual as there are step by step instructions in it for this removal proceedure, and a whole lot of others as well. Those springs have a mind of there own when they come unraveled so you need to be careful.
Good luck. Rick.