Yamaha 115-225 HP Outboards Service Manual, Page 208Get this manual
4) Remove the woodruff key from the crankshaft keyway by use of screwdriverNOTE:
Take especial care not to damage the surface of the crankshaft
M51000-0
CLEANING, INSPECTION AND REPAIR
Be sure to put the tester leads behind the con nector before making an electrical check, or the connector may be damaged