Yamaha F50F Service Manual page 138

POWR
5. Install the piston with the "UP" mark on
the piston crown facing towards the fly-
wheel magnet.
NOTE:
Apply engine oil to the side of the pistons and
piston rings before installation.
Piston slider: 90890-06529
6. Install half of the main bearings 9 into
the cylinder block 0.
E
NOTE:
• Install the main bearings in their original
positions.
• Insert the projection f of each bearing into
the slots in the cylinder block.
7. Set the crankshaft A and oil seals B and
C into the cylinder block as shown.
5-47
Power unit
0
9
f
S6D55920
NOTE:
Apply engine oil to the inner oil seals before
installation.
8. Install the connecting rod caps D to the
connecting rods, and then tighten the
connecting rod bolts to the specified
torques in two stages.
g
D
E
E
S6C15750
6C13G11