Specifications - Yamaha WR450F(Y) 2009 Owner's Service Manual

"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)
Stem-to-guide clearance (IN)
Stem-to-guide clearance (EX)
Stem runout limit
Valve spring:
Free length (IN)
Free length (EX)
Item
MAINTENANCE SPECIFICATIONS
Standard
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 mm (0.0394 in)
1 mm (0.0394 in)
4.475–4.490 mm (0.1762–0.1768 in)
4.965–4.980 mm (0.1955–0.1961 in)
4.500–4.512 mm (0.1772–0.1776 in)
5.000–5.012 mm (0.1969–0.1973 in)
0.010–0.037 mm (0.0004–0.0015 in)
0.020–0.047 mm (0.0008–0.0019 in)
----
39.46 mm (1.55 in)
37.61 mm (1.48 in)
2-5
Limit
----
----
1.6 mm (0.0630
in)
1.6 mm (0.0630
in)
0.85 mm (0.033
in)
0.85 mm (0.033
in)
4.445 mm
(0.1750 in)
4.935 mm
(0.1943 in)
4.550 mm
(0.1791 in)
5.050 mm
(0.1988 in)
0.08 mm (0.003
in)
0.10 mm (0.004
in)
0.01 mm
(0.0004 in)
38.46 mm (1.51
in)
36.61 mm (1.44
in)