Checking The Piston Pins - Yamaha 2009 Diversion XJ6S Service Manual

Top ring
Ring side clearance
0.030–0.065 mm
(0.0012–0.0026 in)
Limit
0.115 mm (0.0045 in)
2nd ring
Ring side clearance
0.030–0.065 mm
(0.0012–0.0026 in)
Limit
0.125 mm (0.0049 in)
2. Install:
Piston ring
G
(into the cylinder)
TIP
Level the piston ring into the cylinder with the
piston crown.
a. 5 mm (0.20 in)
3. Measure:
Piston ring end gap
G
Out of specification → Replace the piston
ring.
TIP
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.
Top ring
End gap (installed)
0.25–0.35 mm (0.0098–0.0138 in)
Limit
0.60 mm (0.0236 in)
2nd ring
End gap (installed)
0.65–0.80 mm (0.0256–0.0315 in)
Limit
1.15 mm (0.0453 in)
Oil ring
End gap (installed)
0.10–0.35 mm (0.0039–0.0138 in)
EAS24440

CHECKING THE PISTON PINS

The following procedure applies to all of the pis-
ton pins.
1. Check:
Piston pin
G
Blue discoloration/grooves → Replace the
piston pin and then check the lubrication sys-
tem.
2. Measure:
Piston pin outside diameter "a"
G
Out of specification → Replace the piston pin.
Piston pin outside diameter
15.990–15.995 mm
(0.6295–0.6297 in)
Limit
15.970 mm (0.6287 in)
3. Measure:
Piston pin bore inside diameter "b"
G
Out of specification → Replace the piston.
Piston pin bore inside diameter
16.002–16.013 mm
(0.6300–0.6304 in)
Limit
16.043 mm (0.6316 in)
5-68
CRANKSHAFT