Yamaha F50A Service Manual page 267

WARNING
Do not hold the propeller with your hands
when loosening or tightening it. Be sure
to remove the battery leads from the bat-
teries and the engine shut-off switch. Put
a block of wood between the cavitation
plate and propeller to keep the propeller
from turning.
NOTE:
If the grooves in the propeller nut 4 do not
align with the cotter pin hole, tighten the nut
until they are aligned.
Propeller nut 4:
35 N·m (3.5 kgf·m, 25 ft·lb)
62Y3A11
Drive shaft and lower case (T50/FT50B, FT50C)
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