Yamaha Waverunner VXS VX1800 Service Manual page 168

a
B
T
c
a. Top ring
b. 2nd ring
c. Oil ring
Top ring
Height (B)
1.170–1.190 mm (0.0461–0.0469 in)
Width (T)
2.850–3.050 mm (0.1122–0.1201 in)
2nd ring
Height (B)
1.170–1.190 mm (0.0461–0.0469 in)
Width (T)
2.600–2.800 mm (0.1024–0.1102 in)
Oil ring
Height (B)
2.370–2.470 mm (0.0933–0.0972 in)
Width (T)
2.500 mm (0.0984 in)
2. Measure the piston ring end gap "a" at the
specified measuring point "b".
b
b
B
T
B
T
a
Crankcase, connecting rod, and piston
Top ring
End gap (installed)
0.300–0.450 mm (0.0118–0.0177 in)
Limit
0.700 mm (0.0276 in)
2nd ring
End gap (installed)
0.450–0.600 mm (0.0177–0.0236 in)
Limit
0.850 mm (0.0335 in)
Oil ring
End gap (installed)
0.100–0.350 mm (0.0039–0.0138 in)
End gap measuring point
6.0 mm (0.24 in)
3. Measure the piston ring grooves.
a. Ring groove (Top)
b. Ring groove (2nd)
c. Ring groove (Oil)
Ring groove (Top ring)
1.210–1.230 mm (0.0476–0.0484 in)
Ring groove (2nd ring)
1.210–1.230 mm (0.0476–0.0484 in)
Ring groove (Oil ring)
2.510–2.530 mm (0.0988–0.0996 in)
4. Measure the piston ring side clearance.
Replace the piston and piston rings as a
set if out of specification.
5-77
a
b
c