Yamaha Rhino 450 YXR45FAV Service Manual page 156

CAMSHAFT, ROCKER ARMS AND VALVES
e. Apply a fine lapping compound to the valve
face and repeat the above steps.
NOTE:
After every lapping operation be sure to clean
off all of the compound from the valve face and
valve seat.
f. Apply Mechanic's blueing dye (Dykem) to
the valve face.
g. Install the valve into the cylinder head.
h. Press the valve through the valve guide and
onto the valve seat to make a clear pattern.
i. Measure the valve seat width again. If the
valve seat width is out of specification,
reface and relap the valve seat.
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10.Measure:
• valve spring free length a
Out of specification → Replace.
Free length (valve spring)
Inner
39.90 mm (1.57 in)
<Limit>: 37.9 mm (1.49 in)
Outer
43.27 mm (1.70 in)
<Limit>: 41.1 mm (1.62 in)
11.Measure:
• compressed spring force a
Out of specification → Replace.
b Installed length
Compressed spring force
Inner
104.9 ~ 120.6 N at 33.6 mm
(10.70 ~ 12.30 kg,
23.58 ~ 27.11 lb at 1.32 in)
Outer
235.4 ~ 251.1 N at 36.6 mm
(24.00 ~ 25.60 kg,
52.92 ~ 56.45 lb at 1.44 in)
4 - 25
ENG
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