Yamaha PW50W 2007, Service Manual

Page: 108 / 168

ENG
5-15
CYLINDER HEAD, CYLINDER AND PISTON
4. Measure:
9
Piston pin bore diameter
b
Out of specification
→
Replace the piston,
piston pin and small end bearing as a set.
5. Calculate:
9
Piston-pin-to-piston-pin-bore clearance
Out of specification
→
Replace the piston
and piston pin as a set.
Piston-pin-to-piston-pin-bore clearance
=Piston pin bore diameter
b
-Piston
pin outside diameter
a
Piston pin bore inside diameter
10.004-10.015 mm (0.3939-0.3943 in)
Limit
10.035 mm (0.3951 in)
Piston-pin-to-piston-pin-bore
clearance
0.004-0.021 mm (0.0002-0.0008 in)
Limit
0.061 mm (0.0024 in)
INSTALLING THE PISTON RING AND PIS-
TON
1. Lubricate:
9
Connecting rod big end bearing
9
Connecting rod small end bearing
(with the recommended lubricant)
Recommended lubricant
Engine oil
5PG-7-10 106 06.5.16, 17:43:54