Yamaha YZ125(P)/LC, Owner'S Service Manual

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4-23
ENG
CYLINDER HEAD, CYLINDER AND PISTON
EC474502
Piston ring
1. Install:
9
Piston ring
Into the cylinder.
Push the ring with the piston crown.
2. Measure:
9
End gap
Use a thickness gauge
1
.
Out of limit
→
Replace.
3. Measure:
9
Side clearance
Use a thickness gauge
1
.
Out of limit
→
Replace piston and/or ring.
NOTE:
Check at several points.
EC474602
Piston clearance
1. Calculate:
9
Piston clearance
Out of limit
→
Replace piston, and piston
ring and/or cylinder.
Refer to “Cylinder” and “Piston”.
Ring end gap (installed):
Standard <Limit>
0.5~0.7 mm 1.2mm
(0.020~0.028 in) (0.047 in)
Side clearance:
Standard <Limit>
0.035~0.070 mm 0.1mm
(0.0014~0.0028 in) (0.004 in)
PISTON
CLEARANCE CYLINDER
BORE PISTON
DIAMETER
=
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5NY-9-30-4B 5/23/01 8:48 PM Page 12