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Yamaha TT-R125EW Owner's Service Manual Page 152

Lit-11626-20-01; 1b2-f8199-12.
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CYLINDER AND PISTON
Piston ring
1. Measure:
Ring side clearance
Use a feeler gauge.
Out of specification → Replace the pis-
ton and rings as a set.
NOTE:
Clean carbon from the piston ring grooves and
rings before measuring the side clearance.
Top
ring
2nd
ring
2. Position:
Piston ring
(in cylinder)
NOTE:
Insert a ring into the cylinder and push it
approximately 40 mm (1.57 in) into the cylin-
der. Push the ring with the piston crown so that
the ring will be at a right angle to the cylinder
bore.
a 40 mm (1.57 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.
Top
ring
2nd
ring
Oil ring
4 - 36
ENG
Side clearance:
Standard
0.035 ~ 0.090 mm
(0.0014 ~ 0.0035 in)
0.020 ~ 0.060 mm
(0.0008 ~ 0.0024 in)
End gap:
Standard
0.15 ~ 0.30 mm
(0.006 ~ 0.012 in)
0.30 ~ 0.45 mm
(0.012 ~ 0.018 in)
0.20 ~ 0.70 mm
(0.01 ~ 0.03 in)
<Limit>
0.12 mm
(0.0047 in)
0.12 mm
(0.0047 in)
<Limit>
0.4 mm
(0.016 in)
0.55 mm
(0.022 in)

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