Checking The Piston Pins - Yamaha FZ1-N Service Manual

Piston ring side clearance
Top ring
0.030–0.065 mm
(0.0012–0.0026 in)
Limit
0.115 mm (0.0045 in)
2nd ring
0.020–0.055 mm
(0.0008–0.0022 in)
Limit
0.115 mm (0.0045 in)
2. Install:
• Piston ring
(into the cylinder)
NOTE:
Level the piston ring into the cylinder with the
piston crown.
5 mm (0.20 in) "a"
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.
Piston ring end gap
Top ring
0.15–0.25 mm
(0.0059–0.0098 in)
Limit
0.50 mm (0.0197 in)
2nd ring
0.30–0.45 mm
(0.0118–0.0177 in)
Limit
0.80 mm (0.0315 in)
Oil ring
0.10–0.40 mm
(0.0039–0.0157 in)
ET2D1016

CHECKING THE PISTON PINS

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 lubrication
system.
2. Measure:
• Piston pin outside diameter "a"
Out of specification → Replace the piston
pin.
Piston pin bore outside diame-
ter
16.991–17.000 mm
(0.6689–0.6693 in)
Limit
16.971 mm (0.6682 in)
3. Measure:
• Piston pin bore inside diameter "b"
Out of specification → Replace the piston.
5-74
CRANKSHAFT