Yamaha YZ450F(D) Owner's Service Manual page 34

Timing chain:
Timing chain type/No. of links
Timing chain adjustment method
Valve, valve seat, valve guide:
Valve clearance (cold)
IN
EX
Valve dimensions:
"A" head diameter (IN)
"A" head diameter (EX)
"B" face width (IN)
"B" face width (EX)
"C" seat width (IN)
"C" seat width (EX)
"D" margin thickness (IN)
"D" margin thickness (EX)
Stem outside diameter (IN)
Stem outside diameter (EX)
Guide inside diameter (IN)
Guide inside diameter (EX)
Item
MAINTENANCE SPECIFICATIONS
Standard
98XRH2010-122M/122
Automatic
0.10–0.15 mm (0.0039–0.0059 in)
0.20–0.25 mm (0.0079–0.0098 in)
35.9–36.1 mm (1.4134–1.4213 in)
29.9–30.1 mm (1.1772–1.1850 in)
2.26 mm (0.089 in)
2.26 mm (0.089 in)
0.9–1.1 mm (0.0354–0.0433 in)
0.9–1.1 mm (0.0354–0.0433 in)
1.3 mm (0.0512 in)
1.0 mm (0.0394 in)
5.475–5.490 mm (0.2156–0.2161 in)
5.465–5.480 mm (0.2152–0.2157 in)
5.500–5.512 mm (0.2165–0.2170 in)
5.500–5.512 mm (0.2165–0.2170 in)
2-4
Limit
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1.6 mm (0.0630
in)
1.6 mm (0.0630
in)
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5.445 mm
(0.2144 in)
5.435 mm
(0.2140 in)
5.550 mm
(0.2185 in)
5.550 mm
(0.2185 in)