Yamaha YP250R 2005 Service Manual page 28

Item
Piston
Piston-to-cylinder clearance
Diameter D
D
Height H
Piston pin bore (in the piston)
Diameter
Offset
Offset direction
Piston pin
Outside diameter
Piston-pin-to-piston-pin-bore clear-
ance
Piston rings
Top ring
Ring type
Dimensions (B × T)
End gap (installed)
Ring side clearance
2nd ring
Ring type
Dimensions (B × T)
End gap (installed)
Ring side clearance
ENGINE SPECIFICATIONS
0.020 ~ 0.040 mm (0.0008 ~ 0.0016 in)
68.965 ~ 68.980 mm (2.7152 ~ 2.7157 in)
H
5.0 mm (0.20 in)
17.004 ~ 17.015 mm (0.6694 ~ 0.6699 in) 17.045 mm
0.50 mm (0.0197 in)
Intake side
16.991 ~ 17.000 mm (0.6689 ~ 0.6693 in) 16.971 mm
0.004 ~ 0.024 mm (0.0002 ~ 0.0009 in)
B
T
Barrel
1.00 × 2.60 mm (0.04 × 0.10 in)
0.15 ~ 0.30 mm (0.0059 ~ 0.0118 in)
0.040 ~ 0.080 mm (0.0016 ~ 0.0031 in)
B
T
Taper
1.00 × 2.90 mm (0.04 × 0.11 in)
0.30 ~ 0.45 mm (0.0118 ~ 0.0177 in)
0.030 ~ 0.070 mm (0.0012 ~ 0.0028 in)
2 - 8
Standard
SPEC
Limit
0.15 mm
(0.0059 in)
----
----
(0.6711 in)
----
----
(0.6681 in)
0.074 mm
(0.0029 in)
----
----
0.45 mm
(0.0177 in)
0.120 mm
(0.0047 in)
----
----
0.70 mm
(0.0276 in)
0.120 mm
(0.0047 in)