Yamaha RS90K Manuel D'atelier page 546

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5-64
CRANKCASE
• Tighten the connecting rod nuts.
Connecting rod nut:
1st: 20 Nm (2.0 m · kg, 14 ft · lb)
Final: Specified angle 120°
• Replace the connecting rod bolts and nuts with
new ones.
CAUTION:
Tighten the connecting rod bolts using the
plastic-region tightening angle method. Always
install new bolts and nuts.
• Clean the connecting rod bolts and nuts.
• Tighten the connecting rod nuts.
• Put a mark e on the corner of the connecting
rod nut 1 and the connecting rod 2.
• Tighten the connecting rod nut further to reach
the specified angle (120°).
WARNING
When the nut is tightened more than the speci-
fied angle, do not loosen the nut and then
retighten it.
Replace the bolt with a new one and perform
the procedure again.
CAUTION:
• Do not use a torque wrench to tighten the nut
to the specified angle.
• Tighten the nut until it is at the specified
angles.
NOTE:
When using a hexagonal nut, note that the angle
from one corner to another is 60°.
• Remove the connecting rod and big end bear-
ings.
• Measure the compressed Plastigauge
on the crankshaft pin.
If the clearance is out of specification, select
replacement big end bearings.
ENG
®
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