Yamaha YZ450F Owner's Service Manual page 46

Cylinder head
Volume
Warpage limit
Camshaft
Drive system
Camshaft cap inside diameter
Camshaft journal diameter
Camshaft-journal-to-camshaft-cap clearance
Camshaft lobe dimensions
Intake A
Limit
Intake B
Limit
Exhaust A
Limit
Exhaust B
Limit
Camshaft runout limit
Timing chain
Tensioning system
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)
A
B
A
B
ENGINE SPECIFICATIONS
25.98–26.78 cm
0.05 mm (0.0020 in)
Chain drive (left)
22.000–22.021 mm (0.8661–0.8670 in)
21.959–21.972 mm (0.8645–0.8650 in)
0.028–0.062 mm (0.0011–0.0024 in)
37.730–37.830 mm (1.4854–1.4894 in)
37.630 mm (1.4815 in)
27.950–28.050 mm (1.1004–1.1043 in)
27.850 mm (1.0965 in)
33.540–33.640 mm (1.3205–1.3244 in)
33.440 mm (1.3165 in)
24.769–24.869 mm (0.9752–0.9791 in)
24.669 mm (0.9712 in)
0.030 mm (0.0012 in)
Automatic
0.13–0.20 mm (0.0051–0.0079 in)
0.20–0.25 mm (0.0079–0.0098 in)
36.90–37.10 mm (1.4528–1.4606 in)
30.40–30.60 mm (1.1968–1.2047 in)
1.697 mm (0.0668 in)
1.768 mm (0.0696 in)
2-3
3
(1.59–1.63 cu.in)