Yamaha WR125R 2009, Service Manual

Page: 31 / 372

ENGINE SPECIFICATIONS
2-6
Height H 5.0 mm (0.20 in)
Offset 0.50 mm (0.0197 in)
Offset direction Intake side
Piston pin bore inside diameter 14.002–14.013 mm (0.5513–0.5517 in)
Limit 14.043 mm (0.5529 in)
Piston pin outside diameter 13.995–14.000 mm (0.5510–0.5512 in)
Limit 13.975 mm (0.5502 in)
Piston-pin-to-piston-pin-bore clearance 0.002–0.018 mm (0.0001–0.0007 in)
Limit 0.068 mm (0.0027 in)
Piston ring
Top ring
Ring type Barrel
Dimensions (B
×
T) 0.80
×
1.90 mm (0.03
×
0.07 in)
End gap (installed) 0.10–0.25 mm (0.0039–0.0098 in)
Limit 0.50 mm (0.0197 in)
Ring side clearance 0.030–0.065 mm (0.0012–0.0026 in)
Limit 0.100 mm (0.0039 in)
2nd ring
Ring type Taper
Dimensions (B
×
T) 0.80
×
2.10 mm (0.03
×
0.08 in)
End gap (installed) 0.10–0.25 mm (0.0039–0.0098 in)
Limit 0.60 mm (0.0236 in)
Ring side clearance 0.020–0.055 mm (0.0008–0.0022 in)
Limit 0.100 mm (0.0039 in)
Oil ring
Dimensions (B
×
T) 1.50
×
1.95 mm (0.06
×
0.08 in)
End gap (installed) 0.20–0.70 mm (0.0079–0.0276 in)
Ring side clearance 0.040–0.160 mm (0.0016–0.0063 in)
Crankshaft
Width A 47.95–48.00 mm (1.888–1.890 in)
H
D
T
B
B
T
B
T