Yamaha WR450FX Owner's Service Manual page 29

Camshaft:
Drive method
Camshaft cap inside diameter
Camshaft outside diameter
Shaft-to-cap clearance
Cam dimensions
Intake "A"
Intake "B"
Exhaust "A"
Exhaust "B"
Camshaft runout limit
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)
Item
MAINTENANCE SPECIFICATIONS
Standard
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)
30.100–30.200 mm (1.1850–1.1890 in)
22.450–22.550 mm (0.8839–0.8878 in)
30.200–30.300 mm (1.1890–1.1929 in)
22.450–22.550 mm (0.8839–0.8878 in)
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98XRH2010-118M/118
Automatic
0.10–0.15 mm (0.0039–0.0059 in)
0.20–0.25 mm (0.0079–0.0098 in)
26.9–27.1 mm (1.0591–1.0669 in)
27.9–28.1 mm (1.0984–1.1063 in)
2-4
Limit
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0.08 mm (0.003
in)
30.000 mm
(1.1811 in)
22.350 mm
(0.8799 in)
30.100 mm
(1.1850 in)
22.350 mm
(0.8799 in)
0.03 mm
(0.0012 in)
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