1991 Yamaha Outboard Factory Service Manual 9.9 and 15 HP, Page 119Get this manual
Starter spring Holding the spring with one hand, unfold the spring from its center with the otherBe careful the spring does not jump outWARNING:
When replacing the starter rope, cut it to the specified length (1,650 mm or 65 in) and burn the rope end so that it will not ravel
When removing or installing the starter spring, use care not to injure your hand
Starter spring Check the starter spring for distorted ends or breaks and replace as requiredAlso check for wear or breakage of the starter spring retainer postsStarter housing shaft Check the starter housing shaft for cracks, chips, excessive wear or other defects and replace as requiredStarter spring