Yamaha XC125 Service Manual page 59

INSPECTION AND REPAIR I"-ml_-_ ] _
I//2 2. Position:
0 mm O
Piston ring
_@ \_ _in)(into
cylinder)
Push the ring with the piston crown.
3. Measure:
• End gap
__ Use Feeler Gauge _).
Out of specification -+ Replace rings as
_ set.
Standard Limit
0.15 ~ 0.30 mm 0.40 mm
Top Ring (0.006 ~ 0.012 in) (0.16 in)
0.15 _ 0.30 mm 0,40 mm
2rid Ring (0.006 ~ 0.012 in) (0.16 in)
Oil Control 0.30 ~ 0.90 mm 0,40 mm
(Rails) (0.012 ~ 0.035 in) (0.16 in)
Oversize Piston Rings
• The oversize top and middle ring sizes are
stamped on top of the ring.
Oversize 2 0.50 mm (0.0197 in)
Oversize 4 1.00 mm (0.0394 in)
3-20