YAMAHA SUPERJET 2001 Manual Online

4-12
E
EJU00546
Inspecting the steering cable
Check for smooth operation of the handle-
bars and jet thrust nozzle.
Turn the handlebars as far as possible to
the right and left and check that the distance
between the jet thrust nozzle and the hull
are equal on right and left sides.
If steering is stiff or misadjusted, have a
Yamaha dealer service it.Distance A and B: A = B
EJU00550
Inspecting and adjusting the
throttle cable
Check that the throttle cable moves back
to the set position smoothly and that free
play is within specification.
1. Squeeze and release the throttle lever. If
the lever does not return smoothly, have
a Yamaha dealer service it.
2. Adjust free play a by loosening the lock-
nut 1 and turning the adjuster 2.
Throttle lever free play:
7.0–10.0 mm (0.27–0.39 in)
E_GM6-4.fm Page 12 Tuesday, July 11, 2000 11:28 AM

4-13
E
EJU00948
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 the center electrode porcelain is
very white, this could indicate an intake air
leak or carburetion problem in that cylinder.
Do not attempt to diagnose any problems
yourself. Have a Yamaha dealer service the
watercraft.
Remove and inspect the spark plug peri-
odically; heat and deposits will cause the
spark plug 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.
Measure the spark plug gap a with a
wire thickness gauge before installing the
spark plug. Adjust the gap to specification if
necessary.
To reinstall spark plug:
1. Clean the gasket surface.
2. Wipe any dirt from the threads of the
spark plug.
3. Screw the spark plug to the correct
torque. Standard spark plug:
NGK BR-7HS
Spark plug gap:
0.6–0.7 mm (0.024–0.028 in)
Spark plug torque:
25 Nm (2.5 m·kg, 18 ft·lb)
E_GM6-4.fm Page 13 Tuesday, July 11, 2000 11:28 AM

4-14
E
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 clicks.
●If a torque wrench is not available when
you are fitting a new spark plug, a good
estimate of the correct torque with a new
gasket is a quarter turn to a half turn past
finger tight. 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 explosion
or fire.
@
EJU00553
Lubrication points
To keep moving parts sliding or rotating
smoothly, coat them with water-resistant
grease.
●Throttle cable (carburetor end)
●Choke cable (carburetor end)
●Throttle cable (handlebar end)
Pull the throttle lever and remove the seal 1.
Spray a rust inhibitor into the outer cable. Refit
the seal securely.
Recommended water resistant grease:
Yamaha Marine Grease/
Yamaha Grease A
E_GM6-4.fm Page 14 Tuesday, July 11, 2000 11:28 AM

4-15
E
●Steering cable ball joint (handlebar end)
●Steering cable inner wire (handlebar end)
1. To access the steering cable and joint,
remove the handle cover by removing
the two bolts.
2. Grease the steering cable ball joints both
on the handlebar end of the cable and on
the jet thrust nozzle end.
3. Extend the steering cable inner wire, and
then apply a thin coat of grease to both
the handlebar end and the jet thrust noz-
zle end.
●Steering cable ball joint (nozzle end)
●Steering cable inner wire (nozzle end)
●Steering handle pivot shaft
Lubrication of the steering handle pivot
shaft requires disassembly of steering com-
ponents. Have a Yamaha dealer lubricate it.
●Steering nozzle pivot bolts (collars)
E_GM6-4.fm Page 15 Tuesday, July 11, 2000 11:28 AM

4-16
E
●Intermediate housing
Using a grease gun, fill the intermediate
housing with water-resistant grease through
the grease nipple.
Grease capacity:
Initial 10 hours or 1 month:
20–22 cm
3
Every 100 hours or 6 months:
3–5 cm3
EJU00570
Adjusting the choke cable
Check that the choke cable is properly
adjusted.
1. Pull the choke knob out until it stops, and
then release the knob. The knob should
not move.
2. Adjust the friction. If the choke knob
moves back on its own, tighten the choke
knob adjusting nut 1 slightly. If the knob
is difficult to move, loosen the adjusting
nut slightly.
E_GM6-4.fm Page 16 Tuesday, July 11, 2000 11:28 AM

4-17
E
EJU00572
Inspecting the battery
Check the level of the battery electrolyte
and make sure the leads are secure.
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.
@
CAUTION:
Be careful not to place the battery on its
side.
Make sure to remove the battery from the
battery compartment when adding the
battery electrolyte or charging the bat-
tery.
When checking the battery, make sure
the breather hose is connected to the
battery and not obstructed.
@
E_GM6-4.fm Page 17 Tuesday, July 11, 2000 11:28 AM

4-18
E
To replenish the battery:
1. Make sure the electrolyte level is between
the maximum 1 and minimum 2 level
marks.
2. Refill the battery with distilled water if
necessary.
CAUTION:@Normal tap water contains minerals that
are harmful to a battery. Use only dis-
tilled water for replenishing the battery.
@
To charge the battery:
1. Remove the caps from the battery cells.
If the level is low, add distilled water.
2. Connect the battery to a charger. Set the
charging rate at 1.9 A, and then charge
the battery for 10 hours.
WARNING@●The battery gives off explosive gases.
When charging the battery, keep it well
away from sparks and open flames.
●When using a battery charger, connect
the battery to the charger before you
turn the charger on. This will prevent
sparking at the terminals, which could
ignite battery gases.
@
To connect the battery terminals:
1. Make sure the connections are correct
when you insert the battery into the
watercraft.
2. Make sure that the breather hose is
properly connected and that it is not
damaged or obstructed.
3. Make sure the battery is securely held in
place.
1Positive (+): Red lead
2Negative (–): Black lead
3Breather hose
Specific gravity: 1.28 at 20 °C (68 °F)
E_GM6-4.fm Page 18 Tuesday, July 11, 2000 11:28 AM

4-19
E
EJU00573
Adjusting the carburetor
The carburetor is a vital part of the engine
and requires very sophisticated adjustment.
Most adjusting should be left to a Yamaha
dealer who has the professional knowledge
and experience to perform it. However, the
operator may adjust the trolling speed as
part of the usual maintenance routine.
CAUTION:@The carburetor was set at the Yamaha
factory after many tests. If the settings
are disturbed by someone who does not
have the necessary technical knowledge,
poor engine performance and damage
may result.
@
EJU00574a
Adjusting the trolling speed
1. Put the watercraft in the water.
2. Start the engine and warm it up for 1 or
2 minutes. Using a diagnostic tachome-
ter, adjust the engine speed to specifica-
tion.
3. Turn the throttle stop screw 1 clockwise
to increase engine speed if necessary.
Turn it counterclockwise to decrease
engine speed if necessary.
Trolling speed: 1,250–1,350 r/min
E_GM6-4.fm Page 19 Tuesday, July 11, 2000 11:28 AM

4-20
E
EJU00578
Replacing the fuse
The fuse is in the electrical box 1.
To replace the fuse:
1. Remove the cap 2, pull out the red lead,
and bring the fuse holder 3 out of the
electrical box.
2. Open the fuse holder and replace the
fuse4 with one of the correct amper-
age.
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: 10 A
EJU00582
Adjusting the steering friction
The amount of friction in the steering can
be adjusted to suit operator preference.
To adjust the friction:
1. Loosen the four screws, and then
remove the handlebar cover.
2. Turn the handlebars as far as possible to
starboard (right).
3. Loosen the locknut 2.
4. Tighten or loosen the adjusting nut 1
until the desired amount of friction is
reached.
5. Hold the adjusting nut with one wrench
while tightening the locknut with another
wrench.
Tightening torque:
29 Nm (2.9 m·kg, 21 ft·lb)
E_GM6-4.fm Page 20 Tuesday, July 11, 2000 11:28 AM

4-21
E
EJU00953
Adjusting the jet thrust nozzle
angle
The angle of the jet thrust nozzle can be
adjusted to suit operator preference.
1. Loosen the two screws, and then remove
the steering pole cover 1.
2. Select the desired nozzle angle a.
Changing the position of the handlebar
stopper and/or steering cable pivot bolt
changes the nozzle angle as shown in
the following chart.
E_GM6-4.fm Page 21 Tuesday, July 11, 2000 11:28 AM