Yamaha F90D, Service Manual

Page: 77 / 241

POWR
Power unit
5-11
6D81G11
4. Install the driven sprockets
0
, timing belt
9
, and spring
8
, and then tighten the
tensioner bolt.
5. Check the intake valve clearance for cyl-
inders #1 and #2, and the exhaust valve
clearance for cylinders #1 and #3. Adjust
if out of specification.
NOTE:
• Check the valve clearance when the engine
is cold.
• Note the measurement.
6. Turn the flywheel magnet 360° clock-
wise.
7. Check the intake valve clearance for cyl-
inders #3 and #4, and the exhaust valve
clearance for cylinders #2 and #4. Adjust
if out of specification.
8. Turn the flywheel magnet clockwise and
align the “TDC” mark on the flywheel
magnet with the pointer, and check that
the “
” marks on the driven sprockets
are aligned.
9. Loosen the tensioner bolt
7
, and then
remove the spring
8
, timing belt
9
,
driven sprockets
0
, camshaft caps
A
,
and camshafts
B
.
NOTE:
Do not mix the valve train parts. Keep them
organized in their proper groups.
10. Remove the valve lifters from the cylinder
head.
S6D85160
8
0
9
S6D85170
IN EX
#1
#2
#3
#4
f e
Valve clearance (cold):
Intake
e
:
0.20
±
0.03 mm (0.008
±
0.001 in)
Exhaust
f
:
0.34
±
0.03 mm (0.013
±
0.001 in)
S6D85180
B
A
0
0
7
9
8