I have a 1977 model Mercury 20HP 2 cycle and am having troubles with the pull start cord not recoiling if the motor does not crank. I can manually push the pull cord back in and it will catch and on the second pull it starts and the cord recoils back in. Any suggestions would be apprectiated. You all are champs on this site and have never lead me wrong, THANKS in advance to anyone that can help me out on this.