engine YAMAHA SUPERJET 2001 Owner's Manual

3-7
E
EJU00432
Water separator
Check the water separator 1 for water.
Normally the water separator is empty. The
water separator retains any water entering
through the fuel tank breather hose if the
watercraft capsizes.
If water remains in the water separator,
drain it by removing the drain screw 2.
Install the drain screw again after draining
the water separator.
EJU00941
Bilge
Check for moisture and fuel residue in the
bilge.
Excessive water in the bilge can splash
into the carburetor and engine which could
cause engine damage.
E_GM6-3.fm Page 7 Tuesday, July 11, 2000 10:52 AM

3-8
E
EJU00435
Battery
Check the battery condition and the elec-
trolyte level. Check that the battery leads are
tightened securely and there is no corrosion
on the battery terminals.
WARNING@The battery must always be fully charged
and in good condition. Loss of battery
power may leave you stranded. Never
operate the watercraft if the battery does
not have sufficient power to start the
engine or if it shows any other signs of
decreased power.
@
Make sure that the breather hose is prop-
erly connected and that it is not damaged or
obstructed.
Make sure that the battery is securely
held in place.
1
Positive (+): Red lead
2
Negative (–): Black lead
3
Breather hose
E_GM6-3.fm Page 8 Tuesday, July 11, 2000 10:52 AM

3-10
E
EJU00447
Throttle
Squeeze and release the throttle lever
several times to make sure that there is no
hesitation in its travel. It should be smooth
over the complete range, and spring back to
the idle position when released.
WARNING
Before starting the engine, always check
the operation of the throttle lever. It
should move smoothly through its full
range of operation, and should spring
back to the idle position when released.
EJU00448
Steering system
Check for looseness in the handlebars.
Turn them as far as possible to the right and
left to make sure that operation is smooth
and unrestricted throughout the whole
range. Make sure that the jet thrust nozzle
also changes directions as the handlebars
are turned, and that there is no free play
between the handlebars and the jet thrust
nozzle.
EJU00449
Steering pole
Check for looseness in the steering pole.
Move it up and down to make sure operation
is smooth and unrestricted throughout the
whole range. Make sure the steering pole
does not have any side play.
E_GM6-3.fm Page 10 Tuesday, July 11, 2000 10:52 AM

3-11
E
EJU00942
Jet unit
Carefully check the jet intake for weeds,
debris, or anything else that might restrict
the intake of water. If the intake is clogged,
cavitation could occur, reducing jet thrust,
and possibly damaging the jet pump. In
some cases, the engine may overheat
because of lack of cooling water, and dam-
age to the engine could result. Engine cool-
ing water is fed to the engine by the jet
pump. (See page 5-3 for jet intake cleaning
procedures).
WARNING@●Keep away from intake grate while
engine is on. Items such as long hair,
loose clothing, or PFD straps can
become entangled in moving parts
resulting in severe injury or drowning.
●Stop the engine and remove the clip
from the engine shut-off switch before
removing any debris or weeds which
may have collected around the jet
intake.
@
EJU9001a
Engine shut-off cord (lanyard)
Check that the engine shut-off cord is not
frayed or broken. If the cord is damaged,
replace it; never try to repair it or tie it
together.
E_GM6-3.fm Page 11 Tuesday, July 11, 2000 10:52 AM

3-12
E
EJU00915
Switches
Check the start switch 1, the engine stop
switch 2 and the engine shut-off switch 4
for proper operation. To check these
switches place the watercraft in the water to
provide adequate engine cooling. Start the
engine, and then pull the engine shut-off
cord5 to remove the clip 3 from the
engine shut-off switch. Verify that the engine
stops immediately. (See pages 3-15 to 3-18
for information on proper operation of the
start switch, the engine stop switch and the
engine shut-off switch.)
EJU00453
Cooling water pilot outlet
Check that water comes out from the out-
let while the engine is running and the
watercraft is in the water.
E_GM6-3.fm Page 12 Tuesday, July 11, 2000 10:52 AM

3-13
E
EJU00456
Operation
WARNING@Before operating your watercraft,
become familiar with all controls. Con-
sult your Yamaha dealer about any con-
trols or functions you do not fully
understand. Failure to understand how
controls work could cause an accident or
prevent you from avoiding an accident.
@
EJU00458
Engine break-in
The engine break-in period is essential to
allow the various components of the engine
to wear and polish themselves to the correct
operating clearances. This ensures proper
performance and promotes longer compo-
nent life.
CAUTION:@●For the first 5 hours or 2 tankfuls of
operation, premix fuel and oil in a 25:1
ratio.
●After break-in, premix fuel and oil in a
50:1 ratio for normal operation.
@
1. Launch the watercraft and start the
engine, and then board the watercraft.
2. Run the engine at the lowest possible
speed for 5 minutes.
E_GM6-3.fm Page 13 Wednesday, July 12, 2000 3:01 PM

3-14
E
3. Gradually open the throttle lever to 3/4 or
less.
4. Continue operation at 3/4 throttle or less
until the first tankful of fuel has been
used.
5. Fill the tank once more with a fuel-to-oil
ratio of 25:1, and proceed with normal
operation.
CAUTION:@Failure to follow the engine break-in pro-
cedure properly can result in severe
damage to the engine.
@
E_GM6-3.fm Page 14 Tuesday, July 11, 2000 10:52 AM

3-15
E
EJU00927
Starting the engine
WARNING@Never start the engine or let it run for any
length of time in an enclosed area.
Exhaust fumes contain carbon monox-
ide, a colorless, odorless gas that may
cause loss of consciousness and death
within a short time. Always operate the
watercraft in an open area.
@
1. Launch the watercraft in water free from
weeds and debris and at least 60 cm
(2 ft) deep.
WARNING@Never operate in water that is less than
60 cm (2 ft) deep, otherwise you increase
your chance of hitting a submerged
object, which could result in injury.
@
CAUTION:@Never operate in water that is less than
60 cm (2 ft) deep, otherwise pebbles or
sand could be sucked into the jet intake,
causing impeller damage or engine over-
heating.
@
2. Turn the fuel cock knob to the “ON” posi-
tion.
NOTE:@Before starting the watercraft after it has
been sitting, remove the fuel tank filler cap
to release any built-up pressure in the tank
due to fuel expansion.
@
E_GM6-3.fm Page 15 Tuesday, July 11, 2000 10:52 AM

3-16
E
3. Attach the clip 1 to the engine shut-off
switch 2. Also, attach the engine shut
off cord 3 to your wrist.
WARNING@Check that the engine shut-off cord is not
frayed or broken, and keep it free from
the handlebars so the engine stops if the
operator falls off. The engine shut-off
cord may not pull free if wrapped around
the handlebars when the operator falls
off, allowing the watercraft to continue to
run and cause an accident.
@
NOTE:@It is not possible to start the engine with the
clip removed from the engine shut-off
switch.
@
4. Pull and hold the choke knob all the way
out.
NOTE:@The choke should not be used when the
engine is warm.
@
5. While lightly squeezing the throttle lever,
push the start switch.
WARNING@On this watercraft, the engine is con-
nected directly to the jet pump. Starting
the engine immediately generates some
thrust. Apply only enough throttle to
keep the engine running.
@
E_GM6-3.fm Page 16 Tuesday, July 11, 2000 10:52 AM

3-17
E
6. Release the start switch as soon as the
engine starts to run.
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
try again.
@
7. After the engine has warmed up, push
the choke knob in to its original position.
NOTE:@If the choke knob is left pulled out, the
engine will stall.
@
E_GM6-3.fm Page 17 Tuesday, July 11, 2000 10:52 AM