2005 YAMAHA VX110 engine

3-16
E
INSP
ADJ
POWER UNIT
Remove the oil tank filler cap again and
check that the oil level is between the
minimum level mark a
and maximum
level mark b
on the dipstick.
If the engine oil is below the minimum
level mark b
, add sufficient oil of the rec-
ommended type to raise it to the correct
level.
If the engine oil is above the maximum
level mark a
, extract sufficient oil using
an oil changer to lower it to the correct
level.
NOTE:
If the oil temperature is low, the reading on
the dipstick will be low, and if the tempera-
ture is high, the reading on the dipstick will
be high.
Engine oil change — using oil changer
WARNING
Avoid changing the engine oil immediately
after turning the engine off. The oil is hot
and should be handled with care to avoid
burns.
CAUTION:
Do not run the engine with too much or
not enough oil in the oil tank. Oil could
spray out or the engine could be dam-
aged.
Do not run the engine for more than 15
seconds without supplying water, when
checking the oil level on land.
The engine could overheat.
Be sure to change the engine oil after the
first 10 hours of operation, and every 100
hours thereafter or at the start of a new
season, otherwise the engine will wear
quickly.
1. Warm the engine up, and then put the
watercraft in a horizontal position.
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3-17
E
INSP
ADJ
POWER UNIT
2. Remove:
Oil tank filler cap 1

3. Insert the tube of an oil changer into the oil
filler hole.
4. Operate the oil changer to extract the oil.
5. If the oil filter is also to be replaced, per-
form the following procedure.
6. Pour the specified amount of the recom-
mended engine oil into the oil filler hole. Replacing steps:
Place a rag under the oil filter.
Remove the oil filter 1
with an oil filter
wrench.
Oil filter wrench:
YB-01426/90890-01426
Lubricate the O-ring 2
of the new oil filter
with a thin coat of engine oil.
CAUTION:
Make sure the O-ring
2 is positioned
correctly in the groove of the oil filter.
Tighten the new oil filter to specification
with an oil filter wrench.
T R..
Oil filter:
17 N  m (1.7 kgf  m, 12 ft  lb)
1
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3-18
E
INSP
ADJ
POWER UNIT
7. Fill:
Oil tank
(with the specified amount of the recom-
mended engine oil)
CAUTION:
When starting the engine make sure the
dipstick is securely fitted into the oil tank.
8. Install:
Oil tank filler cap
Recommended oil:
SAE 10W-30, 20W-40, 20W-50
API SE, SF, SG, SH, SJ, SL
Oil quantity:
Total amount:
4.3 L (4.5 US qt, 3.8 Imp qt)
Without oil filter replacement:
2.0 L (2.1 US qt, 1.8 Imp qt)
With oil filter replacement:
2.2 L (2.3 US qt, 1.9 Imp qt)
Air filter element clean
1. Disconnect:
Fuel hose 1

Air intake hose 2

Oil separator breather hose 3

2. Remove:
Plastic ties 4

Bolts 5

1
2 4
45 4
3
3. Remove:
Air filter case
4. Remove:
Air filter case cover
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3-19
E
INSP
ADJ
POWER UNIT
5. Remove the air filter element and check it
for dirt and oil. Replace the air filter ele-
ment if there is any oil buildup.
CAUTION:
Do not start the engine with the air filter
case removed, otherwise the engine
could be damaged.
If cleaning the air filter element, use cold
or lukewarm water and let it air dry com-
pletely. Do not use detergent or a solvent
to clean the air filter element, or dry it with
heat or compressed air, otherwise it
could be damaged.
6. Install:
Air filter element
NOTE:
Install the air filter element with its projections
a
facing away from the projections b
on the
air filter case.
7. Install:
Air filter case cover
8. Install:
Air filter case
T R..
Air filter case cover screw (short):
1.5 N  m (0.15 kgf  m, 1.1 ft  lb)
LOCTITE 572
Air filter case cover screw (long):
1.2 N  m (0.12 kgf  m, 0.9 ft  lb)
LOCTITE 572
T R..
Air filter case:
17 N  m (1.7 kgf  m, 12 ft  lb)
a
b
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3-20
E
INSP
ADJ
POWER UNIT
Spark plug inspection
1. Remove:
Ignition coils
CAUTION:
Be careful not to get any foreign sub-
stances or water in spark plug hole.
2. Inspect:
Electrodes 1

Damage/wear →
Replace.
Insulator color 2

Distinctly different color →
Check the
engine condition.
Color guide:
Medium to light tan color:
Normal
Whitish color:
Lean fuel mixture
Air leak
Incorrect settings
Blackish color:
Overly rich mixture
Electrical malfunction
Defective spark plug
3. Clean:
Spark plug
(with a spark plug cleaner or wire brush)
4. Measure:
Spark plug gap a

Out of specification →
Regap.
Spark plug gap:
0.7–0.8 mm (0.028–0.031 in)
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4-1
EFUELFUEL TANK AND FUEL PUMP MODULE
FUEL TANK AND FUEL PUMP MODULE
EXPLODED DIAGRAM
REMOVAL AND INSTALLATION CHART
Step Procedure/Part name Q’ty Service points
FUEL TANK REMOVAL
Follow the left “Step” for removal.
Storage compartment panel Refer to “FRONT HOOD” in Chapter 8.
Ventilation hose From ventilation fitting
Engine unit Refer to “ENGINE UNIT” in Chapter 5.
NOTE:
When removing the pump module only, it is
not necessary to remove the engine unit.
1 Fuel tank breather hose 1
2 Check valve 1
NOTE:
Make sure the arrow direction pointed
toward fuel tank.
7
10
11 3
2
1
18
17121315
16
14
12 6 5
4 8
9
2nd 6.4 N • m (0.64 kgf  m, 4.6 ft  Ib) 1st 3.2 N  m (0.32 kgf  m, 2.3 ft  Ib)
3.7 N  m (0.37 kgf  m, 2.7 ft  Ib)
5.9 N  m (0.59 kgf  m, 4.3 ft  Ib)
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4-14
EFUEL
THROTTLE BODY ASSEMBLY AND INTAKE
MANIFOLD
Fuel hose installation (replacing with new
fuel hose)
1. Install:
Fuel hose 1

NOTE:
To install the fuel hose, be sure to align the
white mark a
of the fuel hose with the
checker tab 2
of the quick connector.
When replacing the fuel hose with a new
one, a checker tab 2
that has half engage-
ment prevention is attached to the quick con-
nector of the hose. If the quick connector is
completely installed to the fuel pipe, it is
removable.
2
1a
2
Fuel hose connection
1. Apply a thin coat of engine oil to the con-
tact surfaces of the fuel pipe.
2. Insert the quick connector into the fuel
pipe until you hear a “click.”
3. To check the connection of the quick con-
nector, push and pull on the quick connec-
tor several times until there is free play of
2–3 mm (0.08–0.12 in).
NOTE:
If free is not obtained, disconnect the fuel hose
and check the O-ring for damage and that it is
properly installed.
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4-17
EFUEL
THROTTLE BODY ASSEMBLY AND INTAKE
MANIFOLD
Air filter case assembly installation
1. Install:
Air intake duct 1

Air intake hose 2

Air filter case cover
NOTE:
Align the projections a
on the air intake duct
and air intake hose with the projections b
on
the air filter case cover as shown in the illustra-
tion.
2. Adjust:
Throttle lever free play
Refer to “CONTROL SYSTEM” in Chap-
ter 3.
a
b a
b
2
1
Fuel pressure measurement
1. Disconnect:
Fuel hose
Refer to “Fuel hose disconnection”.
2. Install:
Fuel pressure gauge adapter 1

Fuel pressure gauge 2

NOTE:
To connect the fuel pressure gauge adapter,
follow the procedures for connecting a fuel
hose. (Refer to “Fuel hose connection”.)
3. Start the engine and arrow it to warm up
for several minutes.
4. Measure:
Fuel pressure
Out of specification →
Replace the fuel
pump module.
Fuel pressure gauge adapter:
YW-06842/90890-06842
Fuel pressure gauge:
YB-06766/90890-06786
Fuel pressure:
320–327 kPa
(3.2–3.3 kgf/cm
2, 46–47 psi)
2
1
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