Yamaha RS90GTZ Service Manual page 438

Item
Valves, valve seats, valve guides:
Valve clearance (cold)
Intake
Exhaust
Valve dimensions
Valve head diameter A
Intake
Exhaust
Valve face width B
Intake
Exhaust
Valve seat width C
Intake
Exhaust
Valve margin thickness D
Intake
Exhaust
Valve stem diameter
Intake
<Limit>
Exhaust
<Limit>
Valve guide inside diameter
Intake
<Limit>
Exhaust
<Limit>
Valve-stem-to-valve-guide clearance
Intake
<Limit>
Exhaust
<Limit>
Valve stem runout limit
Valve seat width
Intake
<Limit>
Exhaust
<Limit>
MAINTENANCE SPECIFICATIONS
0.15 ~ 0.22 mm (0.0059 ~ 0.0087 in)
0.21 ~ 0.25 mm (0.0083 ~ 0.0098 in)
30.90 ~ 31.10 mm (1.2165 ~ 1.2244 in)
25.90 ~ 26.10 mm (1.0197 ~ 1.0276 in)
1.90 ~ 2.62 mm (0.0748 ~ 0.1031 in)
1.90 ~ 2.62 mm (0.0748 ~ 0.1031 in)
0.90 ~ 1.10 mm (0.0354 ~ 0.0433 in)
0.90 ~ 1.10 mm (0.0354 ~ 0.0433 in)
0.80 ~ 1.20 mm (0.0315 ~ 0.0472 in)
0.50 ~ 0.90 mm (0.0197 ~ 0.0354 in)
4.475 ~ 4.490 mm (0.1762 ~ 0.1768 in)
4.445 mm (0.1750 in)
4.460 ~ 4.475 mm (0.1756 ~ 0.1762 in)
4.430 mm (0.1744 in)
4.500 ~ 4.512 mm (0.1772 ~ 0.1776 in)
4.550 mm (0.1791 in)
4.500 ~ 4.512 mm (0.1772 ~ 0.1776 in)
4.550 mm (0.1791 in)
0.010 ~ 0.037 mm (0.0004 ~ 0.0015 in)
0.080 mm (0.0031 in)
0.025 ~ 0.052 mm (0.0010 ~ 0.0020 in)
0.100 mm (0.0039 in)
0.010 mm (0.0004 in)
0.90 ~ 1.10 mm (0.0354 ~ 0.0433 in)
1.6 mm (0.0630 in)
0.90 ~ 1.10 mm (0.0354 ~ 0.0433 in)
1.6 mm (0.0630 in)
9-5
SPEC
Description