Yamaha FX Nytro 2008 Manuel D'atelier page 56

VALVE CLEARANCE ADJUSTMENT
NOTE:
• Cover the timing chain opening with a rag to pre-
• Make a note of the position of each valve lifter 1
NOTE:
• The thickness a of each valve pad is marked in
• Since valve pads of various sizes are originally
2-9
6. Adjust:
• Valve clearance
Adjustment steps:
• Remove the valve lifter 1 and the valve pad 2
with a valve lapper 3.
Valve lapper:
90890-04101
Valve lapping tool:
YM-A8998
vent the valve pad from falling into the crankcase.
and valve pad 2 so that they can be installed in
the correct place.
• Select the proper valve pad from the following
table.
Valve pad thickness
range
1.20 ~
Nos. 2.40 mm
120 ~ 240 (0.047 ~
0.094 in)
hundredths of millimeters on the side that
touches the valve lifter.
installed, the valve pad number must be rounded
in order to reach the closest equivalent to the
original.
• Round off the original valve pad number
according to the following table.
Last digit
0 or 2
5
8
INSP
ADJ
Available valve pads
25 thicknesses in
0.05 mm (0.0020 in)
increments
Rounded value
0
5
10