Yamaha PW50W 2007, Service Manual

Page: 107 / 168

ENG
5-14
2. Check:
9
Connecting rod small end bearing
Blue discoloration/grooves
→
Replace.
CHECKING THE PISTON PIN AND SMALL
END BEARINGS
1. Check:
9
Piston pin
Blue discoloration/grooves
→
Replace the
piston pin.
3. Measure:
9
Piston pin outside diameter
a
Out of specification
→
Replace the piston
pin and small end bearing as a set.
Piston pin outside diameter
9.994-10.000 mm (0.3935-0.3937 in)
Limit
9.974 mm (0.3927 in)
CYLINDER HEAD, CYLINDER AND PISTON
▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼
a. Install a piston ring into the cylinder.
NOTE:
Level the piston ring into the cylinder with the
piston crown.
a
40 mm (1.57 in)
▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲
2. Measure:
9
Piston ring end gap
Out of specification
→
Replace the piston
ring and cylinder as a set.
Piston ring end gap
0.15-0.35 mm (0.0059-0.0138 in)
Limit
0.50 mm (0.0197 in)
5PG-7-10 105 06.5.16, 17:43:53