engine YAMAHA VX 2005 Manual PDF

4-15
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EJU21300
Cleaning and adjusting the
spark plugs
The spark plug is an important engine
component and is easy to inspect. The con-
dition of the spark plug can indicate some-
thing about the condition of the engine. For
example, if one spark plug shows a distinctly
different color, the engine could be defec-
tive. Do not attempt to diagnose any prob-
lems yourself. Have a Yamaha dealer
service the watercraft.
Remove and inspect the spark plugs peri-
odically; heat and deposits will cause the
spark plugs to slowly break down and erode.
If electrode erosion becomes excessive, or if
carbon and other deposits are excessive,
replace the spark plug with the specified
plug.
To remove a spark plug:
1. Remove the seat. (See page 2-5 for seat
removal and installation procedures.)
2. Remove the spark plug cap.
CAUTION:@ Do not use any tools to remove or install
the spark plug cap, otherwise the igni-
tion coil coupler may be damaged. The
spark plug cap may be difficult to remove
because the rubber seal on the end of
the cap fits tightly. To remove the spark
plug cap, simply twist it back and forth
while pulling it up; to install it, twist it
back and forth while pushing it down.
@
3. Remove the spark plug.Specified spark plug: NGK CR9EB
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4-21
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EJU18231
Adjusting the fuel injection
system
The fuel injection system was set at the
Yamaha factory. Have a Yamaha dealer ser-
vice the watercraft if necessary.
CAUTION:@ Do not attempt to adjust the fuel injection
system. If the settings are changed poor
engine performance and damage may
result.
@
EJU18240
Checking the trolling speed
1. Put the watercraft in the water.
2. Start the engine and warm it up. Use the
tachometer in the multifunction meter to
check the trolling speed.
If the trolling speed is out of specification,
have a Yamaha dealer make this adjust-
ment. Trolling speed: 1,550–1,750 r/min
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4-23
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EJU13590
Specifications
MODEL
ITEMUnit VX110 Sport/VX110 Deluxe
WATERCRAFT CAPACITY
Maximum people on board Number of people 3
Maximum load capacity kg (lb) 240 (530)
DIMENSIONS
Length mm (in) 3,220 (126.8)
Width mm (in) 1,170 (46.1)
Height mm (in) 1,150 (45.3)
Dry weight kg (lb) 325 (716)
PERFORMANCE
Maximum output kW (PS) @ r/min 75.0 (102)@ 8,000
Maximum fuel consumption L/h (US gal/h, Imp gal/h) 28 (7.4, 6.2)
Cruising range at full throttle hr. 2.14
Trolling speed r/min 1,550–1,750
ENGINE
Engine type 4-stroke
Number of cylinders 4
Engine displacement
cm
3 (cu in)1,052 (64.2)
Bore & stroke mm (in) 76 ×
58 (2.99 ×
2.28)
Compression ratio 11.4:1
Lubrication system Dry sump
Cooling system Water cooled
Starting system Electric starter
Ignition system TCI
Spark plug CR9EB (NGK)
Spark plug gap mm (in) 0.7–0.8 (0.028–0.031)
Battery capacity V-AH 12-19
Charging system Flywheel magneto
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4-24
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DRIVE UNIT
Propulsion system Jet pump
Jet pump type Axial flow, single stage
Impeller rotation Counterclockwise (viewed from rear)
Jet thrust nozzle horizontal angle Degree 24 + 24
FUEL AND OIL
Recommended fuel Regular unleaded gasoline
Minimum octane rating PON
RON86
90
Recommended engine oil SAE 10W-30, 20W-40, 20W-50
API SE, SF, SG, SH, SJ, SL
Fuel tank capacity
Total L (US gal, Imp gal) 60 (15.9, 13.2)
Engine oil quantity
With oil filter replacement L (US qt, Imp qt) 2.2 (2.3, 1.9)
Without oil filter replacement L (US qt, Imp qt) 2.0 (2.1, 1.8)
Total amount L (US qt, Imp qt) 4.3 (4.5, 3.8)MODEL
ITEMUnit VX110 Sport/VX110 Deluxe
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5-1
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EJU11160
Troubleshooting
If you have any trouble with your watercraft, use this section to check for the possible
cause.
If you cannot find the cause, or if the procedure for replacement or repair is not described
in this Owner’s/Operator’s Manual, have a Yamaha dealer perform the necessary service.
EJU13670
Troubleshooting chart
TBC-F0P7ETROUBLE POSSIBLE CAUSE REMEDY PAGE
Engine does not
startStarter motor does not turn over
Yamaha
Security
System
(VX110
Deluxe)Lock mode selected Select unlock mode
2-15
Engine shut-
off switchClip not in place Install clip
2-9
Fuse Burned out Replace the fuse and
check wiring4-22
Battery Run down Recharge 4-19
Poor terminal connec-
tionsTighten as required
4-19
Terminal corroded Clean 4-5
Starter motor Faulty Have serviced by
Yamaha dealer—
Starter motor turns over
Throttle lever Squeezed Release 2-10
Fuel Empty Refill as soon as possi-
ble3-4
Stale or contaminated Have serviced by
Yamaha dealer4-10
Fuel tank Water or dirt present Have serviced by
Yamaha dealer4-10
Spark plug Fouled or defective Clean or replace 4-15
Spark plug cap Not connected or loose Connect properly 4-15
Connected to wrong
cylinderConnect properly
4-15
Fuel injection
systemFuel pump faulty Have serviced by
Yamaha dealer—
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5-2
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Engine runs irregu-
larly or stallsFuel Empty Refill as soon as possi-
ble3-4
Stale or contaminated Have serviced by
Yamaha dealer4-10
Fuel tank Water or dirt present Have serviced by
Yamaha dealer4-10
Spark plug Fouled or defective Replace 4-15
Incorrect heat range Replace 4-15
Gap incorrect Adjust 4-15
Spark plug cap Loose Connect properly 4-15
Cracked, torn, or dam-
agedReplace
—
Electrical wir-
ingLoose connection Tighten or connect
properly—
Fuel injection
systemJet nozzle clogged Have serviced by
Yamaha dealer—
Warning light or
indicator blinksFuel level Empty Refill as soon as possi-
ble3-4
Engine over-
heatedJet intake clogged Clean
5-3
Check engine
warningFaulty sensors Have serviced by
Yamaha dealer—
Wate rcr af t slow or
loses powerYamaha
Security
System
(VX110
Deluxe)Low-RPM mode
selectedSelect normal mode
2-15
Cavitation Jet intake clogged Clean 5-3
Impeller damaged or
wornHave serviced by
Yamaha dealer—
Engine over-
heat warningEngine speed reduc-
tion control activatedClean jet intake and
cool engine2-22
Oil pressure
warningEngine speed reduc-
tion control activatedAdd oil
2-21
Spark plug Fouled or defective Replace 4-15
Incorrect heat range Replace 4-15
Gap incorrect Adjust 4-15
Spark plug
capsLoose Connect properly
4-15
Electrical wir-
ingLoose connection Tighten or connect
properly—
Fuel Stale or contaminated Have serviced by
Yamaha dealer4-10
Air filter Clogged or oil buildup Have serviced by
Yamaha dealer4-13 TROUBLE POSSIBLE CAUSE REMEDY PAGE
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5-3
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EJU11180
Emergency procedures
EJU21601
Cleaning the jet intake and
impeller
If weeds or debris get caught in the intake
or impeller, cavitation can occur, causing jet
thrust to decrease even though engine
speed rises. If this condition is allowed to
continue, the engine will overheat and may
seize. If there is any sign that the jet intake
or impeller is clogged with weeds or debris,
beach the watercraft and check the intake
and impeller. Always stop the engine before
beaching the watercraft.
WARNING@ Before attempting to remove weeds or
debris from the jet intake or impeller
areas, shut the engine off and remove
the clip from the engine shut-off switch.
Severe injury or death could result from
contact with the rotating parts of the jet
pump.
@
CAUTION:@ If weeds or debris get caught in the
intake, do not operate the watercraft
above trolling speed until they have been
removed.
@
1. Turn the watercraft on its side as shown.
CAUTION:@
Place a suitable clean cloth or carpet-
ing underneath the watercraft to pro-
tect it from abrasions and scratches.

Always turn the watercraft over onto
its port (left) side.

When turning the watercraft on its
side, support the bow so the handle-
bars cannot be bent or damaged.
@
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5-4
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2. Remove any weeds or debris from
around the drive shaft, impeller, pump
housing, and jet thrust nozzle.
If debris is difficult to remove, consult
your Yamaha dealer.
CAUTION:@ Always avoid operating your watercraft in
areas where weed growth is thick. If trav-
eling in weeded areas is unavoidable,
operate the engine alternately at partial
throttle and full throttle. Weeds tend to
accumulate more at a steady speed and
at trolling speed. If weeds clog the intake
or impeller area and cause cavitation, fol-
low the cleaning procedure above.
@
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5-5
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EJU18440
Jumping the battery
If the watercraft battery has run down, the
engine can be started using a 12-volt bat-
tery and jumper cables.
WARNING@ Battery electrolyte is poisonous and dan-
gerous, causing severe burns, etc. Elec-
trolyte contains sulfuric acid. Avoid
contact with skin, eyes or clothing.
Antidotes
External: Flush with water.
Internal: Drink large quantities of water
or milk. Follow with milk of magnesia,
beaten egg or vegetable oil. Call physi-
cian immediately.
Eyes: Flush with water for 15 minutes
and get prompt medical attention.
Batteries produce explosive gases. Keep
sparks, flame, cigarettes, etc. well away.
If using or charging the battery in an
enclosed space, make sure that it is well
ventilated. Always shield your eyes when
working near batteries.
KEEP OUT OF THE REACH OF CHIL-
DREN.
@
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5-6
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EJU18450
Connecting the jumper cables
1. Connect the positive (+) jumper cable 1
to the positive (+) terminals of both bat-
teries.
2. Connect one end of the negative (–)
jumper cable 2 to the negative (–) termi-
nal of the booster battery 3.
3. Connect the other end of the negative (–)
cable to an engine hanger 4.
CAUTION:@ Do not connect the end of the jumper
cable to the negative (–) terminal on the
watercraft battery! Be sure all connec-
tions are secure and correct before
attempting to start the engine. Any
wrong connection may damage the elec-
trical system.
@
4. Start the engine, and then disconnect
the cables by reversing the steps above.
CAUTION:@
Never push the start switch while the
engine is running.

Do not operate the start switch for
more than 5 seconds, otherwise the
battery will be discharged and the
engine will not start. Also, the starter
motor may be damaged. If the engine
does not start in 5 seconds, release
the start switch, wait 15 seconds, and
then try again.
@
UF1K70.book Page 6 Friday, November 19, 2004 2:42 PM