Yamaha LIT-11616-16-02 Model Vehicle User Manual


 
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ENG
CAMSHAFT, ROCKER ARMS AND VALVES
Apply a fine lapping compound to the valve
face and repeat the above steps.
N
OTE:
After every lapping operation, be sure to clean
off all of the compound from the valve face and
valve seat.
Apply Mechanics blueing dye (Dykem) to the
valve face.
Install the valve into the cylinder head.
Press the valve through the valve guide and
onto the valve seat to make a clear pattern.
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.
11.Measure:
Compressed spring force a
Out of specification Replace.
b
Installed length
Free length (valve spring):
Inner:
39.9 mm (1.57 in)
<Limit>: 37.9 mm (1.49 in)
Outer:
43.27 mm (1.70 in)
<Limit>: 41.27 mm (1.62 in)
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,
52.91 ~ 56.45 lb at 1.44 in)