Yamaha Marine Outboards Factory Service / Repair/ Workshop Manual 225G 250B L250B, Page 170Get this manual
LOWER UNIT (COUNTER ROTATION MODELS)
REMOVING THE PROPELLER
Remove: Propeller
WARNING
Do not hold the propeller with your hands when removing or installing itBe sure to remove the battery leads from the batteries and the lanyard engine stop switchPut block of wood between the cavitation plate and propeller to keep the propeller from turning