Yamaha YZ125 2016 Owner's Service Manual page 27

MAINTENANCE SPECIFICATIONS
ENGINE
Item
Cylinder head:
Combustion chamber volume
Warp limit
Cylinder:
Bore size
Taper limit
Out of round limit
Piston:
Piston size/
Measuring point "H"
Piston clearance
Piston offset
Piston pin:
Piston pin outside diameter
Piston ring:
Sectional sketch
End gap (installed)
Side clearance (installed)
MAINTENANCE SPECIFICATIONS
Standard
3
8.30–8.50 cm (0.51–0.52 cu.in)
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54.000–54.014 mm (2.1260–2.1265 in)
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53.957–53.972 mm (2.1243–2.1249 in)
17.5 mm (0.69 in)
0.040–0.045 mm (0.0016–0.0018 in)
0.50 mm (0.0197 in)/EX-side
14.995–15.000 mm (0.5904–0.5906 in)
Barrel
B=1.00 mm (0.04 in)
T=2.35 mm (0.09 in)
0.50–0.70 mm (0.0197–0.0276 in)
0.035–0.070 mm (0.0014–0.0028 in)
2-3
Limit
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0.03 mm
(0.0012 in)
54.100 mm
(2.1299 in)
0.050 mm
(0.0020 in)
0.010 mm
(0.0004 in)
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0.100 mm
(0.0039 in)
----
14.975 mm
(0.5896 in)
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1.20 mm
(0.0472 in)
0.100 mm
(0.0039 in)