Yamaha Tenere 700 2020, Service Manual

Page: 218 / 472

VALVES AND VALVE SPRINGS
5-31
b. Apply molybdenum disulfide oil onto the
valve stem.
c. Install the valve into the cylinder head.
d. Turn the valve until the valve face and
valve seat are evenly polished, then clean
off all of the lapping compound.
TIP
For the best lapping results, lightly tap the valve
seat while rotating the valve back and forth be-
tween your hands.
e. Apply a fine lapping compound to the
valve face and repeat the above steps.
f. After every lapping procedure, be sure to
clean off all of the lapping compound from
the valve face and valve seat.
g. Apply blue layout fluid “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
impression.
j. Measure the valve seat width “c” again. If
the valve seat width is out of specification,
reface and lap the valve seat.
EAS30286
CHECKING THE VALVE SPRINGS
The following procedure applies to all of the
valve springs.
1. Measure:
• Valve spring free length “a”
Out of specification
→
Replace the valve
spring.
EAS30287
CHECKING THE VALVE LIFTERS
The following procedure applies to all of the
valve lifters.
1. Check:
• Valve lifter
Damage/scratches
→
Replace the valve lift-
ers and cylinder head.
EAS30288
INSTALLING THE VALVES
The following procedure applies to all of the
valves and related components.
G0 88 96 8
G0 88 969
G0 88 967
Free length (intake)
40.30 mm (1.59 in)
Limit
38.29 mm (1.51 in)
Free length (exhaust)
41.39 mm (1.63 in)
Limit
39.32 mm (1.55 in)
G0 88 970
G0 88 971