Yamaha XC125 Service Manual page 159

SPECIFICATIONS
APPX I
MAINTENANCESPECIFICATIONS
Engine
Model XC125S
Warp Limit < 0.05 mm (0.002 in) >
* Lines indicate straightedge measurement.
I
Cylinder:
Bore Size/Masuring Point* -X- 49.00 _ 49.01 mm 11.929 _ 1.930 in)/
19.0 mm (0.75 in) (From the top of the cylinder)
< Limit> <49.1 mm (1.933 in)>
i
Camshaft:
Drive Method Chain (Left)
Cam Dimensions: !_ _ "A"
Intake & Exhaust 26.169 _ 26.269 mm (1.030 _ 1.034 in)
"B" 21.061 _ 21.161 mm (0.829 "_ 0.833 in)
5.264 _ 5.274 mm (0.207 _ 0.208 in)
Rocker Arm/Rocker Arm Shaft:
Shaft Outside Diameter 9.81 _ 9.91 mm (0.386 _ 0.390 in)
Arm-to-shaft Clearance 0.09 _ 0.34 mm (0.0035 _ 0.0134 in)
< Limit > < 0.08 mm (0.0032 in) >
Valve, Valve Seat, Valve Guide:
Valve Clearance (Colde): IN. 0.08 _ 0.12 mm (0.003 _ 0.005 in)
EX. 0.10 _ 0.14 mm (0.004 _ 0.006 in)
Valve Dimensions:
Head Dia. Face Width Seat Width Margin Thickness
"A" Head Diameter: IN. 25.9 _- 26.1 mm 11.020 _" 1.028 in)
EX. 21.9 _ 22.1 mm (0.862 _ 0.870 in)
"B" Face Width: IN. 1.4 _ 3.0 mm (0.055 _ 0.118 in)
EX. 1.7 _2.8 mm (0.067 _ 0.110 in)
"C" Seat Width/< Limit >: IN. 0.9 _ 1.1 mm (0.035 _- 0.043 in)/
< 1.6 mm (0.063 in) >
EX. 0.9 _ 1.1 mm (0.035 _ 0.043 in)/ _J
< 1.6 mm (0.063 in) >
"D" Margin Thickness: IN. 0.4~ 0.8mm(0.016 ~ 0.031 in)
EX. 0.8 _ 1.2 mm (0.031 _ 0,047 in)
Stem Outside Diameter/< Limit >: IN. 4.975 _- 4.990 mm (0.1959 "- 0.1965 in)/
<4.950 mm (0.1949 in) >
EX. 4.960 _ 4.975 mm (0.1953 _ 0.1959 in)/
< 4.953 mm (0.1950 in) >
7-4