Yamaha Fazer, Service Manual

Page: 97 / 213

ENG
1
5mm
ENGINE INSPECTION AND REPAIR
4-23
PISTON RING INSPECTION
1. Measure :
• Side clearance
Out of specification Ÿ Replace the Piston
and the Piston Rings as a set
NOTE :
Remove the carbon deposits from the Piston
Ring Grooves and Rings before measuring the
side clearance.
2. Position :
• Piston Ring
(in the Cylinder bore)
NOTE :
Push the Ring with the Piston Crown so that
the Ring will be at right angles to the Cylinder
Bore 5 mm from the bottom side.
3. Measure :
• End gap ¿ using a feeler gauge
Out of specification Ÿ Replace
NOTE :
You cannot measure the end gap on the ex-
pander spacer of the Oil Ring, If the Oil Ring
Rails show excessive gap, replace all three
Rings.
Side clearance :
Top Ring : <Limit>
0.030 ~ 0.07 mm
2nd Ring : <Limit>
0.020 ~ 0.060 mm
Eng gap :
Top Ring : 0.10 ~ 0.30 mm
<limit> : <0.40 mm>
2nd Ring : 0.30 ~ 0.45 mm
<Limit> : <0.55 mm>
Oil Ring : 0.2 ~ 0.7 mm