Checking The Piston Pin - Yamaha FJR1300AS(X) Service Manual

Piston ring
Top ring
Ring side clearance
0.030–0.070 mm (0.0012–
0.0028 in)
Limit
0.120 mm (0.0047 in)
2nd ring
Ring side clearance
0.020–0.060 mm (0.0008–
0.0024 in)
Limit
0.120 mm (0.0047 in)
2. Install:
• Piston ring
(into the cylinder)
NOTE:
Level the piston ring into the cylinder with the
piston crown.
a. 5 mm (0.20 in)
3. Measure:
• Piston ring end gap
Out of specification → Replace the piston
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.
CONNECTING RODS AND PISTONS
Piston ring
Top ring
End gap (installed)
Limit
2nd ring
End gap (installed)
Limit
Oil ring
End gap (installed)
EAS24440

CHECKING THE PISTON PIN

The following procedure applies to all of the pis-
ton pins.
1. Check:
• Piston pin
Blue discoloration/grooves → Replace the
piston pin and then check the lubrication sys-
tem.
2. Measure:
• Piston pin outside diameter "a"
Out of specification → Replace the piston pin.
Piston pin outside diameter
18.991–19.000 mm (0.7477–
0.7480 in)
Limit
18.971 mm (0.7469 in)
3. Measure:
• Piston pin bore diameter "b"
Out of specification → Replace the piston.
5-110
0.35–0.45 mm (0.0138–0.0177
in)
0.70 mm (0.0276 in)
0.75–0.85 mm (0.0295–0.0335
in)
1.20 mm (0.0472 in)
0.20–0.60 mm (0.0079–0.0236
in)