Yamaha YZ450FX 2019 Owner's Service Manual page 46

Camshaft journal diameter
Camshaft-journal-to-camshaft-cap clearance
Limit
Camshaft lobe dimensions
Lobe height (Intake)
Limit
Lobe height (Exhaust)
Limit
Camshaft runout limit
Valve, valve seat, valve guide
Valve clearance (cold)
Intake
Exhaust
Valve dimensions
Valve seat contact width (intake)
Limit
Valve seat contact width (exhaust)
Limit
Valve stem diameter (intake)
Limit
Valve stem diameter (exhaust)
Limit
Valve guide inside diameter (intake)
Valve guide inside diameter (exhaust)
Valve-stem-to-valve-guide clearance (in-
take)
Limit
Valve-stem-to-valve-guide clearance (ex-
haust)
Limit
Valve stem runout
Valve spring
Free length (intake)
Limit
Free length (exhaust)
Limit
Cylinder
Bore
Wear limit
Piston
Piston-to-cylinder clearance
Diameter
Measuring point (from piston skirt bottom)
Piston pin bore inside diameter
Limit
Piston pin outside diameter
Limit
Piston-pin-to-piston-pin-bore clearance
ENGINE SPECIFICATIONS
21.959–21.972 mm (0.8645–0.8650 in)
0.028–0.062 mm (0.0011–0.0024 in)
0.080 mm (0.0032 in)
38.130–38.230 mm (1.5012–1.5051 in)
38.030 mm (1.4972 in)
34.270–34.370 mm (1.3492–1.3531 in)
34.170 mm (1.3453 in)
0.030 mm (0.0012 in)
0.10–0.17 mm (0.0039–0.0067 in)
0.15–0.22 mm (0.0059–0.0087 in)
0.90–1.10 mm (0.0354–0.0433 in)
1.5 mm (0.06 in)
0.90–1.10 mm (0.0354–0.0433 in)
1.5 mm (0.06 in)
5.475–5.490 mm (0.2156–0.2161 in)
5.445 mm (0.2144 in)
5.465–5.480 mm (0.2152–0.2157 in)
5.435 mm (0.2140 in)
5.500–5.512 mm (0.2165–0.2170 in)
5.500–5.512 mm (0.2165–0.2170 in)
0.010–0.037 mm (0.0004–0.0015 in)
0.080 mm (0.0032 in)
0.020–0.047 mm (0.0008–0.0019 in)
0.100 mm (0.0039 in)
0.010 mm (0.0004 in)
40.57 mm (1.60 in)
38.54 mm (1.52 in)
37.42 mm (1.47 in)
35.55 mm (1.40 in)
97.000–97.010 mm (3.8189–3.8193 in)
97.060 mm (3.8213 in)
0.010–0.045 mm (0.0004–0.0018 in)
96.955–96.970 mm (3.8171–3.8177 in)
9.0 mm (0.35 in)
18.004–18.015 mm (0.7088–0.7093 in)
18.045 mm (0.7104 in)
17.991–18.000 mm (0.7083–0.7087 in)
17.981 mm (0.7079 in)
0.004–0.024 mm (0.0002–0.0009 in)
2-3