Piston Ring Check - Yamaha WaveRunner FZR-GX1800 Service Manual

POWR
a
B
T
c
T
b
Crankcase, connecting rod, and piston
b
B
T
B
a

Piston ring check

1. Measure:
• Piston ring dimensions B and T
Out of specification → Replace the pis-
ton rings as a set.
Piston ring dimensions:
Top ring
B: 1.17–1.19 mm
(0.0461–0.0469 in)
T: 2.85–3.05 mm
(0.112–0.120 in)
2nd ring
B: 1.17–1.19 mm
(0.0461–0.0469 in)
T: 2.60–2.80 mm
(0.102–0.110 in)
Oil ring
B: 2.37–2.47 mm
(0.093–0.097 in)
T (reference data):
2.50 mm (0.098 in)
2. Measure:
• Piston ring end gap a
Piston ring end gap a
(reference data):
Top ring:
0.30–0.45 mm (0.012–0.018 in)
2nd ring:
0.45–0.60 mm (0.018–0.024 in)
Oil ring:
0.10–0.35 mm (0.004–0.014 in)
Measuring point b:
5 mm (0.2 in)
5-105
a
:
b
:
c
:
E
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