Yamaha YZF-R6 99, Service Manual

Page: 199 / 400

4-71
CONNECTING RODS AND PISTONS
ENG
NOTE:
3. Measure:
piston ring end gap
Out of specification
Replace the piston
ring.
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
<Limit>: 0.50 mm
2nd ring
0.40 0.50 mm
<Limit>: 0.85 mm
Oil ring
0.10 0.35 mm
ABS00266
CHECKING THE PISTON PINS
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
15.991 16.000 mm
3. Measure:
piston pin bore diameter (in the piston)
Out of specification
Replace the piston
pin.
Piston pin bore diameter
(in the piston)
16.002 16.013 mm