Page 120 of 152
4-11
E
EJU18160
Inspecting the fuel system
WARNING@ Gasoline is highly flammable and explo-
sive. Failure to check for and repair any
fuel leakage could result in fire or explo-
sion. A fire or explosion can cause
severe injury or death. Shut off the
engine. Do not smoke. Avoid spilling
gasoline.
Fuel in hose is pressurized.
Fuel can spray out and cause injury or a
fire hazard if fuel line is disconnected.
Do not attempt to run engine with fuel
line disconnected.
@
Check the fuel system for leaks, cracks,
or malfunctions. If any problem is found,
consult a Yamaha dealer.
Check:
Fuel tank for water or dirt.
Fuel tank cap (seal) for damage.
Fuel tank for damage, cracks or leakage.
Fuel hose joint for leakage.
Fuel hose for cracks or other damage.
Air bleeding passages for leakage.
EJU18410
Fuel tank
Check the fuel tank 1 for leakage or
water in the tank. If water is found in the fuel
system or if the fuel tank needs to be
cleaned, have a Yamaha dealer service the
watercraft.
E_F1X-70.book Page 11 Friday, August 26, 2005 11:00 AM
Page 121 of 152
4-12
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EJU21590
Changing the engine oil
WARNING@ Engine oil is extremely hot immediately
after the engine is turned off. Coming
into contact with or getting any engine
oil on your clothes could result in burns.
@
CAUTION:@ Do not run the engine with too much or
not enough oil in the oil tank. Oil could
spray out and the engine could be
damaged.
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.
The oil filter should be replaced every
year or every 100 hours of operation.
Have a Yamaha dealer replace the oil
filter if necessary.
@
It is recommended to have a Yamaha
dealer change the engine oil. However, if
you choose to change the oil on your own,
consult a Yamaha dealer.
NOTE:@ Dispose of used oil according to local regu-
lations.
@
Recommended engine oil:
See page 3-3.
Oil quantity:
With oil filter replacement:
2.3 L (2.4 US qt, 2.0 Imp qt)
Without oil filter replacement:
2.1 L (2.2 US qt, 1.8 Imp qt)
Total amount:
4.5 L (4.8 US qt, 4.0 Imp qt)
E_F1X-70.book Page 12 Friday, August 26, 2005 11:00 AM
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4-17
E
Measure the spark plug gap a with a
wire thickness gauge. Replace the spark
plug or adjust the gap to specification if nec-
essary.
To install the spark plug:
1. Clean the gasket surface.
2. Wipe any dirt from the threads of the
spark plug.
3. Install the spark plug, and then tighten it
to the specified torque.
4. Install the spark plug cap.
NOTE:@ Wipe off any water on the spark plug or
inside the cap before installing the spark
plug cap. Push the spark plug cap down
until it is securely installed.
If a torque wrench is not available when
you are installing a new spark plug, a good
estimate of the correct torque is 1/4 turn to
1/2 turn past finger tight with the spark
plug wrench included in the tool kit. Have
the spark plug adjusted to the correct
torque with a torque wrench as soon as
possible.
@
WARNING@ Be careful not to damage the insulator
when removing or installing a spark plug.
A damaged insulator could allow sparks
to escape, which could lead to an explo-
sion or fire.
@
5. Install the air filter element in the air filter
case, and then install the air filter case
cover. Spark plug gap:
0.7–0.8 mm (0.028–0.031 in)
Spark plug tightening torque:
12.5 N·m (1.25 kgf·m, 9 ft·lb)
E_F1X-70.book Page 17 Friday, August 26, 2005 11:00 AM
Page 130 of 152
4-21
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EJU19710
Inspecting the battery
Check the level of the battery electrolyte
and make sure that the negative and posi-
tive leads are securely tightened.
WARNING@ Battery electrolyte is poisonous and
dangerous, causing severe burns, etc.
Electrolyte contains sulfuric acid.
Avoid contact with skin, eyes, or cloth-
ing.
Antidotes
External: Flush with water.
Internal: Drink large quantities of water
or milk. Follow with milk of magnesia,
beaten egg, or vegetable oil. Call phy-
sician 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 bat-
tery in an enclosed space, make sure
that it is well ventilated. Always shield
your eyes when working near batter-
ies.
KEEP OUT OF THE REACH OF CHIL-
DREN.
Be sure to connect the breather hose
to the battery. Fire or explosion could
result if the breather hose is damaged,
obstructed, or not connected properly.
@
CAUTION:@ Be careful not to place the battery on
its side.
Be sure to remove the battery from the
battery compartment when adding
electrolyte or charging the battery.
@
E_F1X-70.book Page 21 Friday, August 26, 2005 11:00 AM
Page 133 of 152
4-24
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EJU18250
Replacing the fuse
The fuse is in the electrical box 1.
To replace the fuse:
1. Remove the cap 2.
2. Replace the fuse 4 with the spare
fuse5 of the correct amperage by using
the special tool 3 on the reverse side of
the cap.
WARNING@ Do not use fuses of higher amperage
than those recommended. Substitution
of a fuse of improper rating can cause
extensive electrical system damage and
possible fire.
@
Fuse amperage:
20 A (main)
3 A (meter)
3 A (bilge pump)
E_F1X-70.book Page 24 Friday, August 26, 2005 11:00 AM
Page 139 of 152
5-2
E
Engine runs irregu-
larly or stallsFuel Empty Refill as soon as possi-
ble3-4
Stale or contaminated Have serviced by
Yamaha dealer4-11
Fuel tank Water or dirt present Have serviced by
Yamaha dealer4-11
Spark plug Fouled or defective Replace 4-16
Incorrect heat range Replace 4-16
Gap incorrect Adjust 4-16
Spark plug cap Loose Connect properly 4-16
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
SystemLow-RPM mode
selectedSelect normal mode
2-22
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 engine2-30
Oil pressure
warningEngine speed reduc-
tion control activatedAdd oil
2-30
Spark plug Fouled or defective Replace 4-16
Incorrect heat range Replace 4-16
Gap incorrect Adjust 4-16
Spark plug
capsLoose Connect properly
4-16
Electrical wir-
ingLoose connection Tighten or connect
properly—
Fuel Stale or contaminated Have serviced by
Yamaha dealer4-11
Air filter Clogged Clean or replace 4-14
Oil buildup Replace 4-14 TROUBLE POSSIBLE CAUSE REMEDY PAGE
E_F1X-70.book Page 2 Friday, August 26, 2005 11:00 AM
Page 140 of 152
5-3
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EJU11180
Emergency procedures
EJU21602
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,
return to shore 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
area, shut the engine off and remove the
clip from the engine shut-off switch.
Severe injury or death could result from
coming in 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.
E_F1X-70.book Page 3 Friday, August 26, 2005 11:00 AM
Page 142 of 152
5-5
E
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.
@
E_F1X-70.book Page 5 Friday, August 26, 2005 11:00 AM
