Last weekend with my boat at full throttle, the motor suddenly turned off. When the top was popped, the #1 spark plug was loose and somewhat stripped around the threads.<br /><br />I was unable to get the plug back in, and the motor would no longer start. <br /><br />Does anyone have any ideas what may have caused the plug to go loose, and how the stripped threads on the motor can be repaired or replaced?<br /><br />Thanks in advance! 