Checking The Valve Springs - Yamaha WR450F Owner's Service Manual
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Also See for WR450F:
- Owner's manual (98 pages) ,
- Supplementary owner's service manual (28 pages) ,
- Owner's service manual (795 pages)
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g. Apply Mechanic's blueing dye (Dykem) "b"
onto the valve face.
h. Install the valve into the cylinder head.
i. Press the valve through the valve guide and
onto the valve seat to make a clear impres-
sion.
j. Measure the valve seat contact width "c"
again. If the valve seat contact width is out of
specification, reface and lap the valve seat.
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EAS2GC1253
CHECKING THE VALVE SPRINGS
1. Measure:
• Valve spring free length "a"
Out of specification Replace the valve
spring.
Free length (intake)
40.76 mm (1.60 in)
Limit
38.72 mm (1.52 in)
Free length (exhaust)
36.94 mm (1.45 in)
Limit
35.09 mm (1.38 in)
VALVES AND VALVE SPRINGS
2. Measure:
• Compressed valve spring force "a"
Out of specification Replace the valve
spring.
b. Installed length
Installed compression spring
force (intake)
178.00–204.00 N (18.15–20.80
kgf, 40.01–45.86 lbf)
Installed compression spring
force (exhaust)
124.00–142.00 N (12.64–14.48
kgf, 27.88–31.92 lbf)
Installed length (intake)
34.78 mm (1.37 in)
Installed length (exhaust)
30.83 mm (1.21 in)
3. Measure:
• Valve spring tilt "a"
Out of specification Replace the valve
spring.
Spring tilt (intake)
2.5 °/1.8 mm (2.5 °/0.07 in)
Spring tilt (exhaust)
2.5 °/1.6 mm (2.5 °/0.06 in)
6-28
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