Yamaha WaveRunner FX140 Manuel D'entretien page 404

POWR
CONNECTING RODS AND PISTONS
2. Install:
• Piston ring
(into the cylinder)
NOTE:
Level the piston ring in the cylinder with the
piston crown.
a 5 mm (0.2 in)
3. Measure:
• Piston ring end gap
Out of specification → Replace the pis-
ton ring.
NOTE:
The oil ring expander spacer's end gap cannot
be measured. If the oil ring rail's gap is exces-
sive, replace all three piston rings.
Piston ring end gap:
Top ring:
0.38–0.55 mm
(0.0150–0.0217 in)
2nd ring:
0.49–0.69 mm
(0.0193–0.0272 in)
Oil ring:
0.29–0.59 mm
(0.0114–0.0232 in)
Piston pin inspection
The following procedure applies to all of the
piston pins.
1. Check:
• Piston pin
Blue discoloration/grooves → Replace
the piston pin and then check the lubri-
cation system.
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