Connecting Rod Big End Bearing Assembly (75, 80, 90 Hp) - Yamaha 50G Service Manual

POWR
ASSEMBLY AND ADJUSTMENT
G78000-0*
CONNECTING ROD BIG END
BEARING ASSEMBLY (75, 80, 90 hp)
1. Install the piston.
Align the ring ends with locating pins in
the grooves and using the piston slider,
push the piston into the cylinder.
Piston slider:
YU-33294/90890-06530
NOTE:
The "UP" mark on the piston crown should
be on the flywheel side. Be sure to apply oil
to the piston and cylinder wall.
2. Place the crankshaft on the cylinder,
and align the upper, upper middle and
lower middle bearing pin holes with the
pins on the cylinder, and fit the crank-
shaft correctly to the cylinder.
3. Install the bearing in the big end and
install the cap.
The cap bolts should be tightened in the
following manner.
a. Lightly screw in the bolts by hand
while making sure the cap and rod
ends are aligned completely. Then,
tighten the bolts to the 1st specified
torque.
Next, tighten to the 2nd specified
torque. Check to see that the cap and
rod ends are aligned. If not aligned,
do the above procedure all over
again.
b. Loosen the bolts 1/2 turn and tighten
them to the 1st specified torque.
Then, tighten to the 2nd specified
torque.
5-16
E