Installing The Valves And Valve Springs - Yamaha YFM400FAR Service Manual

CAMSHAFT, ROCKER ARMS AND VALVES
12.Measure:
Spring tilt a
G
Out of specification → Replace.
Spring tilt limit:
Inner:
2.5°/1.6 mm (0.06 in)
Outer:
2.5°/1.6 mm (0.06 in)
INSTALLING THE VALVES AND VALVE
SPRINGS
1.Apply:
Molybdenum disulfide oil
G
(onto the valve stem and valve stem seal)
2.Install:
Valve spring seat
G
Valve stem seal
G
Valve
G
Valve springs (inner and outer)
G
Valve spring retainer
G
NOTE:
Install the valve springs with the larger pitch a
facing upwards.
b Smaller pitch
3.Install:
Valve cotters
G
NOTE:
Install the valve cotters while compressing the
valve springs with the valve spring compressor 1.
Valve spring compressor:
P/N. YM-04019, 90890-04019
4.To secure the valve cotters onto the valve
stem, lightly tap the valve tip with a piece of
wood.
CAUTION:
Hitting the valve tip with excessive force
could damage the valve.
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ENG
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