Checking The Piston Pins; Connecting Rods And Pistons - Yamaha YZF-R7 Owner's Service Manual

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CONNECTING RODS AND PISTONS

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 excessive, replace all three piston
rings.
Piston ring end gap
Top ring
0.15 ~ 0.25 mm
(0.006 ~ 0.010 in)
<Limit>: 0.50 mm (0.020 in)
2nd ring
0.25 ~ 0.35 mm
(0.009 ~ 0.014 in)
<Limit>: 0.70 mm (0.028 in)
Oil ring
0.1 ~ 0.3 mm
(0.004 ~ 0.012 in)
EB404421

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 lubri-
cation system.
2. Measure:
• piston pin outside diameter a
Out of specification → Replace the pis-
ton pin.
Piston pin outside diameter
16.995 ~ 17.000 mm
(0.6691 ~ 0.6693 in)
<Limit>: 16.975 mm (0.6683 in)
3. Measure:
• piston pin bore diameter (in the piston)
Out of specification → Replace the pis-
ton pin.
Piston pin bore diameter
(in the piston)
17.004 ~ 17.015 mm
(0.6694 ~ 0.6699 in)
<Limit>: 17.045 mm (0.6711 in)
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ENG