Yamaha XF50W Service Manual page 27

Piston
Piston-to-cylinder clearance
Diameter D
Height H
Piston pin bore(in the piston)
Diameter
Offset
Offset direction
Piston pin
Outside diameter
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
Item
_H
"X.
-D—
B
T
\ I B
T I
Standard
0.010~0.035mm
(0.0004~0.0014in)
37.975~37.990mm
(1.4951~1.4957in)
5.0mm(0.1969in)
10.002~10.013mm
(0.3938~0.3942in)
0.35~0.65mm
(0.0138~0.0256in)
Intake side
9.996~10.000mm
(0.3935~0.3937in)
Barrel
0.8×1.65mm
(0.0315×0.0650in)
0.05~0.15mm
(0.0020~0.0059in)
0.03~0.07mm
(0.0012~0.0028in)
Taper
0.8×1.5mm
(0.0315×0.0591in)
0.05~0.17mm
(0.0020~0.0067in)
0.02~0.06mm
(0.0008~0.0024in)
2-8
SPEC 0 *
Limit
0.150mm
(0.0059in)
...
...
10.043mm
(0.3954in)
...
...
9.976mm
(0.3928in)
...
...
0.40mm
(0.0157in)
0.12mm
(0.0047in)
...
...
0.52mm
(0.0205in)
0.12mm
(0.0047in)