Yamaha FZ8NA Service Manual page 53

Valve, valve seat, valve guide
Valve clearance (cold)
Intake
Exhaust
Valve dimensions
Valve head diameter A (intake)
Valve head diameter A (exhaust)
Valve face width B (intake)
Valve face width B (exhaust)
Valve seat width C (intake)
Limit
Valve seat width C (exhaust)
Limit
Valve margin thickness D (intake)
Valve margin thickness D (exhaust)
Valve stem diameter (intake)
Limit
Valve stem diameter (exhaust)
Limit
Valve guide inside diameter (intake)
Limit
Valve guide inside diameter (exhaust)
Limit
Valve-stem-to-valve-guide clearance (intake)
Limit
Valve-stem-to-valve-guide clearance (exhaust)
Limit
Valve stem runout
Valve spring
Free length (intake)
Limit
ENGINE SPECIFICATIONS
0.10–0.17 mm (0.0039–0.0067 in)
0.25–0.29 mm (0.0098–0.0114 in)
25.90–26.10 mm (1.0197–1.0276 in)
21.90–22.10 mm (0.8622–0.8701 in)
1.210–2.490 mm (0.0476–0.0980 in)
1.210–2.490 mm (0.0476–0.0980 in)
0.90–1.10 mm (0.0354–0.0433 in)
1.60 mm (0.06 in)
0.90–1.10 mm (0.0354–0.0433 in)
1.60 mm (0.06 in)
0.50–0.90 mm (0.0197–0.0354 in)
0.50–0.90 mm (0.0197–0.0354 in)
3.975–3.990 mm (0.1565–0.1571 in)
3.945 mm (0.1553 in)
3.960–3.975 mm (0.1559–0.1565 in)
3.930 mm (0.1547 in)
4.000–4.012 mm (0.1575–0.1580 in)
4.050 mm (0.1595 in)
4.000–4.012 mm (0.1575–0.1580 in)
4.050 mm (0.1595 in)
0.010–0.037 mm (0.0004–0.0015 in)
0.080 mm (0.0032 in)
0.025–0.052 mm (0.0010–0.0022 in)
0.100 mm (0.0039 in)
0.010 mm (0.0004 in)
38.62 mm (1.52 in)
36.69 mm (1.44 in)
2-4