Yamaha F90D - Valve Train and Timing Belt Service

6D81G11
5-10
1
2
3
4
5
6
7
8
9
Checking the valve clearance
CAUTION:
• Do not turn the flywheel magnet coun-
terclockwise, otherwise the valve sys-
tem may be damaged.
• Do not remove the ignition timing
pointer.
• Do not turn the flywheel magnet or the
driven sprockets when the timing belt is
not installed. Otherwise the piston and
valves will interfere with each other and
be damaged.
NOTE:
For removal and installation procedures of
the timing belt, driven sprockets, and cam-
shafts, see the applicable procedures in this
manual.
1. Remove the flywheel magnet cover
1
,
filter
2
, and spark plug wire cover
3
,
disconnect the spark plug wires
4
, fuel
hoses
5
, and blowby hose
6
, and then
remove all spark plugs.
2. Turn the flywheel magnet clockwise and
align the “TDC” mark
a
on the flywheel
magnet with the pointer
b
, and check
that “” marks
c
and
d
on the driven
sprockets are aligned.
3. Loosen the tensioner bolt
7
, and then
remove the spring
8
, timing belt
9
,
driven sprockets
0
, and cylinder head
cover
A
.
S6D85130
1
6
3
4
5
2
S6D85140
a
b
c
d
S6D85150
0
0
A
9
8
7
Power unit