Yamaha YZ125(T)/T1 Owner's Service Manual page 258

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.
Ring end gap (installed):
Standard
0.5~0.7 mm
(0.020~0.028 in)
3. Measure:
9 Side clearance
Use a thickness gauge 1.
Out of limit ¡ Replace piston and/or ring.
Side clearance:
Standard
0.035~0.070 mm
(0.0014~0.0028 in)
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".
PISTON
CLEARANCE
4-23
ENG
<Limit>
1.2mm
(0.047 in)
<Limit>
0.1mm
(0.004 in)
CYLINDER PISTON
=
–
BORE DIAMETER