Yamaha F225F, Service Manual

Page: 285 / 576

7-2
Power unit (check and adjustment)
0
1
2
3
4
5
6
7
8
9
10
A
Checking the valve clearance
Measure the valve clearances when the
engine is cold.
Do not turn the flywheel magnet counter-
clockwise. Otherwise, the water pump
impeller could be damaged.
1. Remove the blowby hose
a
.
2. Remove the vapor gas hoses and
canister. See “Removing the canister” (6-
26).
3. Disconnect the ignition coil couplers
a
,
engine ECM couplers
b
, and knock
sensor coupler
c
.
4. Remove the bracket
b
and speed
sensor coupler
d
.
5. Remove the ignition coils and spark
plugs.
6. Remove the engine ECM and engine
ECM bracket.
7. Turn the flywheel magnet
c
clockwise
until the dowel hole
e
in the flywheel
magnet
c
is aligned between the VCT
assembly (STBD)
d
and driven sprocket
(STBD)
e
.
8. Check that the “II” marks
f
on the VCT
assembly (PORT) and driven sprocket
(PORT) are aligned, and check that the
“I” marks
g
on the VCT assembly
(STBD) and driven sprocket (STBD) are
aligned.
9. Remove the timing belt guide (STBD)
and cylinder head covers.
10. Measure the valve clearances
h
and
k
according to steps 11–13.
a
a
a
d c
b
b
c
e
d
e
f
g
#2
#4
#6
#1
#3
#5
STBD PORT
IN EX IN EX