Yamaha WaveRunner FX SHO, Service Manual

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5-103
E
POWR
3. Measure:
• Piston ring grooves
Out of specification
→
Replace the pis-
ton.
NOTE:
Before measuring the piston ring grooves,
eliminate any carbon deposits from the piston
ring grooves.
Piston ring groove:
Top ring
a
:
1.21 – 1.23 mm (0.0476 – 0.0484 in)
2nd ring
b
:
1.21 – 1.23 mm (0.0476 – 0.0484 in)
Oil ring
c
:
2.51 – 2.53 mm (0.0988 – 0.0996 in)
a
b
c
4. Measure:
• Piston ring side clearance
Out of specification
→
Replace the pis-
ton and piston rings as a set.
NOTE:
Before measuring the piston ring side clear-
ance, eliminate any carbon deposits from the
piston ring grooves and piston rings.
Piston ring side clearance:
Top ring
a
:
0.02 – 0.06 mm (0.0008 – 0.0024 in)
2nd ring
b
:
0.02 – 0.06 mm (0.0008 – 0.0024 in)
Oil ring
c
:
0.04 – 0.16 mm (0.0016 – 0.0063 in)
Piston pin check
1. Measure:
• Piston pin outside diameter
a
Out of specification
→
Replace the pis-
ton pin.
Piston pin outside diameter
a
:
21.991 – 22.000 mm
(0.8658 – 0.8661 in)
Crankcase, connecting rod, and piston