Yamaha YZ250F(D) Owner's Service Manual page 32

Piston pin bore inside diameter
Piston pin outside diameter
Piston rings:
Top ring:
Type
Dimensions (B × T)
End gap (installed)
Side clearance (installed)
2nd ring:
Type
Dimensions (B × T)
End gap (installed)
Side clearance
Oil ring:
Dimensions (B × T)
End gap (installed)
Crankshaft:
Crank width "A"
Runout limit "C"
Big end side clearance "D"
Small end free play "F"
Item
MAINTENANCE SPECIFICATIONS
Standard
16.002–16.013 mm (0.6300–0.6304 in)
15.991–16.000 mm (0.6296–0.6299 in)
Barrel
0.90 × 2.75 mm (0.04 × 0.11 in)
0.15–0.25 mm (0.006–0.010 in)
0.030–0.065 mm (0.0012–0.0026 in)
Taper
0.80 × 2.75 mm (0.03 × 0.11 in)
0.30–0.45 mm (0.012–0.018 in)
0.020–0.055 mm (0.0008–0.0022 in)
1.50 × 2.25 mm (0.06 × 0.09 in)
0.10–0.40 mm (0.004–0.016 in)
55.95–56.00 mm (2.203–2.205 in)
0.03 mm (0.0012 in)
0.15–0.45 mm (0.0059–0.0177 in)
0.4–1.0 mm (0.016–0.039 in)
2-6
Limit
16.043 mm
(0.6316 in)
15.971 mm
(0.6288 in)
----
----
0.50 mm (0.020
in)
0.12 mm (0.005
in)
----
----
0.80 mm (0.031
in)
0.12 mm (0.005
in)
----
----
----
0.05 mm (0.002
in)
0.50 mm (0.02
in)
2.0 mm (0.08
in)