Yamaha PZ50W Service Manual page 240

f
5-71
CRANKCASE
• Tighten the connecting rod bolts.
Connecting rod bolt:
1st: 20 Nm (2.0 m · kg, 14 ft · lb)
Final: Specified angle 120 ~ 130°
• Replace the connecting rod bolts with new
ones.
CAUTION:
Tighten the connecting rod bolts using the
plastic-region tightening angle method. Always
install new bolts.
Tightening steps:
• Clean the connecting rod bolts.
• Tighten the connecting rod bolts.
• Put a mark e on the corner of the connecting
rod bolt 1 and the connecting rod 2.
• Tighten the connecting rod bolt further to reach
the specified angle (120 ~ 130°).
WARNING
When the bolt is tightened more than the speci-
fied angle, do not loosen the bolt 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 bolt
to the specified angle.
• Tighten the bolt until it is at the specified
angles.
• 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
®
width f