Yamaha XT250X 2008, Service Manual

Page: 25 / 282

ENGINE SPECIFICATIONS
2-6
Offset 0.50 mm (0.0197 in)
Offset direction Intake side
Piston pin bore inside diameter 16.002–16.013 mm (0.6300–0.6304 in)
Limit 16.043 mm (0.6316 in)
Piston pin outside diameter 15.991–16.000 mm (0.6296–0.6299 in)
Limit 15.971 mm (0.6288 in)
Piston-pin-to-piston-pin-bore clearance 0.002–0.022 mm (0.0001–0.0009 in)
Piston ring
Top ring
Ring type Barrel
Dimensions (B
×
T) 0.90
×
2.75 mm (0.04
×
0.11 in)
End gap (installed) 0.19–0.31 mm (0.0075–0.0122 in)
Limit 0.56 mm (0.0220 in)
Ring side clearance 0.030–0.065 mm (0.0012–0.0026 in)
Limit 0.115 mm (0.0045 in)
2nd ring
Ring type Taper
Dimensions (B
×
T) 0.80
×
2.80 mm (0.03
×
0.11 in)
End gap (installed) 0.30–0.45 mm (0.0118–0.0177 in)
Limit 0.80 mm (0.0314 in)
Ring side clearance 0.020–0.055 mm (0.0008–0.0022 in)
Limit 0.115 mm (0.0045 in)
Oil ring
Dimensions (B
×
T) 1.50
×
2.60 mm (0.06
×
0.10 in)
End gap (installed) 0.10–0.35 mm (0.0039–0.0138 in)
H
D
T
B
B
T
B
T
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