Yamaha VK10W, Supplementary Service Manual

Page: 119 / 208

51
SPEC
MAINTENANCE SPECIFICATIONS
Valves, valve seats, valve guides:
Valve clearance (cold)
Intake 0.15 ~ 0.22 mm (0.0059 ~ 0.0087 in)
Exhaust 0.21 ~ 0.25 mm (0.0083 ~ 0.0098 in)
Valve dimensions
Valve head diameter A
Intake 29.9 ~ 30.1 mm (1.1771 ~ 1.1850 in)
Exhaust 25.9 ~ 26.1 mm (1.0197 ~ 1.0276 in)
Valve face width B
Intake 1.90 ~ 2.62 mm (0.0748 ~ 0.1031 in)
Exhaust 1.90 ~ 2.62 mm (0.0748 ~ 0.1031 in)
Valve seat width C
Intake 0.9 ~ 1.1 mm (0.035 ~ 0.043 in)
Exhaust 0.9 ~ 1.1 mm (0.035 ~ 0.043 in)
Valve margin thickness D
Intake 0.8 ~ 1.2 mm (0.0315 ~ 0.0472 in)
Exhaust 0.5 ~ 0.9 mm (0.0197 ~ 0.0354 in)
Valve stem diameter
Intake 4.975 ~ 4.990 mm (0.1959 ~ 0.1965 in)
<Limit> 4.945 mm (0.1947 in)
Exhaust 4.965 ~ 4.980 mm (0.1955 ~ 0.1961 in)
<Limit> 4.935 mm (0.1943 in)
Valve guide inside diameter
Intake 5.000 ~ 5.012 mm (0.1969 ~ 0.1973 in)
<Limit> 5.05 mm (0.199 in)
Exhaust 5.000 ~ 5.012 mm (0.1969 ~ 0.1973 in)
<Limit> 5.05 mm (0.199 in)
Valve-stem-to-valve-guide clearance
Intake 0.010 ~ 0.037 mm (0.0004 ~ 0.0015 in)
<Limit> 0.08 mm (0.0031 in)
Exhaust 0.020 ~ 0.047 mm (0.0008 ~ 0.0019 in)
<Limit> 0.10 mm (0.0039 in)
Valve stem runout limit 0.01 mm (0.0004 in)
Valve seat width
Intake 0.9 ~ 1.1 mm (0.0354 ~ 0.0433 in)
<Limit> 1.6 mm (0.0630 in)
Exhaust 0.9 ~ 1.1 mm (0.0354 ~ 0.0433 in)
<Limit> 1.6 mm (0.0630 in)
Model VK10W
A
B
C
D