4 - 35
ENG
CYLINDER AND PISTON
CHECKING THE PISTON RING
1.Measure:
●
Ring side clearance
Use a feeler gauge.
Out of specification
→
Replace the piston
and rings as a set.
NOTE:
Clean carbon from the piston ring grooves and
rings before measuring the side clearance.
Side clearance
Standard
Limit
Top
ring
0.04 ~ 0.08 mm
(0.0016 ~ 0.0031 in)
0.13 mm
(0.0051 in)
2nd
ring
0.03 ~ 0.07 mm
(0.0012 ~ 0.0028 in)
0.13 mm
(0.0051 in)
2.Position:
●
Piston ring
(in cylinder)
NOTE:
Insert a ring into the cylinder and push it
approximately 50 mm (2.0 in) into the cylinder.
Push the ring with the piston crown so that the
ring will be at a right angle to the cylinder bore.
a
50 mm (2.0 in)
3.Measure:
●
Ring end gap
Out of specification
→
Replace.
NOTE:
You cannot measure the end gap on the
expander spacer of the oil control ring. If the oil
control ring rails show excessive gap, replace
all three rings.
End gap
Standard
Limit
Top
ring
0.30 ~ 0.45 mm
(0.0118 ~ 0.0177 in)
0.70 mm
(0.0276 in)
2nd
ring
0.30 ~ 0.45 mm
(0.0118 ~ 0.0177 in)
0.80 mm
(0.0315 in)
Oil
ring
0.2 ~ 0.7 mm
(0.0079 ~ 0.0276 in)
—
Summary of Contents for YFM660FS
Page 1: ...LIT 11616 17 14 5KM 28197 E2 YFM660FS SUPPLEMENTARY SERVICE MANUAL ...
Page 17: ...YAMAHA MOTOR CO LTD 2500 SHINGAI IWATA SHIZUOKA JAPAN PRINTED IN U S A ...
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Page 72: ...YFM660FP SERVICEMANUAL LIT 11616 15 01 5KM 28197 E0 ...
Page 117: ...2 11 SPEC MAINTENANCE SPECIFICATIONS Item Standard Cylinder head tightening sequence ...
Page 417: ...9 3 ELEC CHECKING THE SWITCH ...
Page 478: ...YAMAHA MOTOR CO LTD 2500 SHINGAI IWATA SHIZUOKA JAPAN PRINTED IN U S A ...