Yamaha XP500 Service Manual page 45

Item
Valves, valve seats, valve guides
Valve clearance (cold)
Intake
Exhaust
Valve dimensions
A
Head Diameter
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
Exhaust
Valve guide inside diameter
Intake
Exhaust
Valve-stem-to-valve-guide clearance
Intake
Exhaust
ENGINE SPECIFICATIONS
0.15 ~ 0.20 mm (0.0059 ~ 0.0079 in)
0.25 ~ 0.30 mm (0.0098 ~ 0.0118 in)
B
Face Width
24.9 ~ 25.1 mm (0.9803 ~ 0.9882 in)
21.9 ~ 22.1 mm (0.8622 ~ 0.8701 in)
1.14 ~ 1.98 mm (0.0449 ~ 0.0780 in)
1.14 ~ 1.98 mm (0.0449 ~ 0.0780 in)
0.9 ~ 1.1 mm (0.0354 ~ 0.0433 in)
0.9 ~ 1.1 mm (0.0354 ~ 0.0433 in)
0.6 ~ 0.8 mm (0.0236 ~ 0.0315 in)
0.6 ~ 0.8 mm (0.0236 ~ 0.0315 in)
3.975 ~ 3.990 mm (0.1565 ~ 0.1571 in)
3.960 ~ 3.975 mm (0.1559 ~ 0.1565 in)
4.000 ~ 4.012 mm (0.1575 ~ 0.1580 in)
4.000 ~ 4.012 mm (0.1575 ~ 0.1580 in)
0.010 ~ 0.037 mm (0.0004 ~ 0.0015 in)
0.025 ~ 0.052 mm (0.0010 ~ 0.0020 in)
2 - 5
Standard
C
Seat Width
SPEC
Limit
----
----
D
Margin Thickness
----
----
----
----
1.6 mm
(0.06 in)
1.6 mm
(0.06 in)
0.5 mm
(0.0197 in)
0.5 mm
(0.0197 in)
3.945 mm
(0.1553 in)
3.930 mm
(0.1547 in)
4.050 mm
(0.1594 in)
4.050 mm
(0.1594 in)
0.080 mm
(0.0032 in)
0.100 mm
(0.0039 in)