Operation
65
B. Less throttle produces lower thrust, so
the watercraft will turn more gradually.
C. Releasing the throttle lever completely
produces only minimum thrust. If you are
traveling at speeds above trolling, you will
have rapidly decreasing ability to steer
without throttle. You may still have some
turning ability immediately after releasing
the throttle lever, but once the engine
slows down, the watercraft will no longer
respond to handlebar input until you ap-
ply throttle again or you reach trolling
speed.
At trolling speed, the watercraft can be
turned gradually by handlebar position
alone using just the amount of thrust
available at idle.D. If the engine is stopped while riding, there
is no thrust. The watercraft will go straight
even though the handlebars are turned.
You need throttle to steer.
This model is equipped with the Yamaha En-
gine Management System (YEMS) that in-
cludes an off-throttle steering (OTS) system.
It will activate at planing speeds should you
attempt to steer the watercraft after releasing
the throttle lever (see condition C above).
The OTS system assists in turning by continu-
ing to supply some thrust while the watercraft
is decelerating, but you can turn more sharply
if you apply throttle while turning the handle-
bars. The OTS system does not function be-
low planing speeds or when the engine is off.
Once the engine slows down, the watercraft
will no longer turn in response to handlebar in-
put until you apply throttle again or you reach
trolling speed.
EJU37510Stopping the watercraft
The watercraft is not equipped with a sepa-
rate braking system. It is stopped by water re-
sistance when the throttle lever is released.
From full speed, the watercraft comes to a
complete stop in approximately 130 m (430 ft)
after the throttle lever is released or the en-
gine is stopped, although this distance will
vary depending on many factors, including
gross weight, water surface conditions, and
wind direction. The watercraft slows down as
UF2C70E0.book Page 65 Monday, November 3, 2008 10:16 AM
Maintenance and care
70
water passages by alternately squeezing
and releasing the throttle lever for 10 to
15 seconds.
(8) Stop the engine.
(9) Remove the garden hose adapter and in-
stall the flushing hose connector cap.
(10) Install the watertight compartment and
the rear seat.
EJU36911Lubrication
(1) Lubricate all cables such as the throttle
and steering cables.
Use a suitable marine grease applicator
to pressure-lubricate the cables and
purge out any moisture between the inner
and outer cables.
(2) Lubricate the areas of the watercraft
specified in “Lubrication points” on page
77.
EJU33681Battery
If the watercraft will not be used for more than
a month, remove the battery from the water-
craft and store it in a cool, dry place.
(1) Disconnect the negative (–) battery lead
first, then the positive (+) battery lead and
breather hose, and then remove the bat-
tery from the watercraft.
(2) Clean the battery casing using fresh wa-
ter.
(3) If the battery terminals are dirty or corrod-
ed, clean them with a wire brush.
(4) Fully charge the battery.
(5) Apply Yamaha Marine Grease or
Yamaha Grease A to the battery termi-
nals, and then store the battery in a cool,
dry place.
(6) Check the battery at least once every 2
months and fully charge it if necessary.
NOTICE: Always keep the battery
charged. Storing a discharged batterycan cause permanent battery damage.
[ECJ00101]
To check the condition of the battery, check
the specific gravity of the electrolyte or mea-
sure the voltage at both battery terminals.
Charge the battery if the voltage is less than
12 volts.
It is recommended to have a Yamaha dealer
check the specific gravity and charge the bat-
tery. If you maintain the battery yourself, be
sure to read and follow the instructions provid-
ed with the battery tester and charger you
use.
EJU33731Cleaning the watercraft
Clean the watercraft before storing it for a long
period.
(1) Wash down the hull, handlebars, and jet
unit with fresh water.
(2) Rinse the engine and engine compart-
ment with fresh water. Drain all of the wa-
ter and wipe up any remaining moisture
with clean, dry rags. NOTICE: Do not
use high-pressure water when rinsing
the engine and engine compartment
as severe engine damage could result.
[ECJ00111]
(3) Spray the engine’s exterior with a rust in-
hibitor and lubricant.
(4) Wax the hull with a non-abrasive wax.
(5) Wipe all vinyl and rubber components,
such as the seat and engine compart-
ment seals, with a vinyl protectant. Specific gravity (for reference):
1.28 at 20 °C (68 °F)
UF2C70E0.book Page 70 Monday, November 3, 2008 10:16 AM
Maintenance and care
72
EJU37060Periodic maintenance chart
The following chart gives general guidelines for periodic maintenance. However, maintenance
may need to be performed more frequently depending on your operating conditions.
This“” mark indicates maintenance that you may do yourself.
This“” mark indicates work to be done by a Yamaha dealer.
Item OperationInitial Thereafter every
Page 10
hours50
hours100
hours100
hours200
hours
6
months12
months12
months24
months
Spark plugsCheck, clean, adjust 76
Lubrication pointsLubricate 77
Internal engine
componentsLubricate*2
50 hours or 12 months—
QSTS cablesLubricate—
Intermediate hous-
ingLubricate 77
Fuel systemCheck 74
Fuel tankCheck, clean 74
Trolling speedCheck, adjust 80
Throttle shaftCheck—
Cooling water pas-
sagesFlush
*169
Water inlet strain-
erCheck, clean—
Bilge strainerClean—
Electric bilge
pump strainerCheck, clean—
ImpellerCheck—
Jet thrust nozzle
angleCheck, adjust 74
Steering masterCheck—
QSTS mechanismCheck, adjust—
Shift cable and re-
verse gateCheck, adjust 75
Throttle cableCheck, adjust 75
Stern drain plugsCheck, replace 49
UF2C70E0.book Page 72 Monday, November 3, 2008 10:16 AM
Maintenance and care
75
If the steering is stiff or misadjusted, have a
Yamaha dealer service it.
EJU36590Checking the shift cable
Place the shift lever in the reverse position.
Make sure that the reverse gate makes con-
tact with the stopper.If the reverse gate does not make contact with
the stopper, have a Yamaha dealer service it.
EJU37480Checking the throttle lever
Operate the throttle lever several times to
make sure that it moves back to the fully
closed (idle) position when released. Also,
make sure that the throttle lever free play is
within the specified range.
(1) Adjust the handlebars to the lowest posi-
tion and face them straight ahead. (See
“Telescopic steering system” on page 29
for more information.)
(2) Squeeze and release the throttle lever.
(3) Check the throttle lever free play with the
throttle lever in the fully closed (idle) posi-
tion. Difference of A and B:
Maximum 5 mm (0.20 in)
1Stopper
A
A
B
B
1Throttle lever free play
Throttle lever free play:
2.0–5.0 mm (0.08–0.20 in)
1
UF2C70E0.book Page 75 Monday, November 3, 2008 10:16 AM
Maintenance and care
78
Throttle cable (handlebar end)
Steering cable (handlebar end)
Steering cable (jet thrust nozzle end)
QSTS rod (jet thrust nozzle end)
Shift cable (reverse gate end)
Intermediate housing
Fill the intermediate housing with water-re-
sistant grease through the grease nipple
using a grease gun.
EJU34452Checking the battery
Check the level of the battery electrolyte and
make sure that the negative (–) and positive
(+) battery leads are tightened securely.
Grease quantity:
Initial 10 hours or 1 month:
33.0–35.0 cm³ (1.12–1.18 US oz,
1.16–1.23 Imp.oz)
Every 100 hours or 12 months:
6.0–8.0 cm³ (0.20–0.27 US oz,
0.21–0.28 Imp.oz)
1Grease nipple
1
UF2C70E0.book Page 78 Monday, November 3, 2008 10:16 AM
Index
Operating your watercraft......................... 58
Operation ................................................. 55
Operation of controls and other
functions ............................................... 24
Operation requirements ........................... 12
Owner’s/operator’s manual and tool kit .... 71
P
Periodic maintenance chart...................... 72
Post-operation care .................................. 67
Pre-operation check list............................ 45
Pre-operation check points ...................... 47
Pre-operation checks ............................... 45
Primary Identification (PRI-ID) number ...... 1
Q
Quick Shift Trim System (QSTS) ............. 52
Quick Shift Trim System (QSTS)
selector ................................................. 30
R
Reboarding grip........................................ 31
Reboarding step ....................................... 32
Recommended equipment ....................... 14
Remote control transmitter ....................... 25
Reverse on waterways ............................. 66
Riding with passengers ............................ 59
S
Safe boating rules .................................... 18
Seats ........................................................ 24
Shift cable, checking ................................ 75
Shift lever ................................................. 29
Shift lever and reverse gate ..................... 51
Shifting ..................................................... 57
Spark plugs, cleaning and adjusting ........ 76
Speedometer............................................ 35
Start switch............................................... 27
Starting the engine ................................... 55
Starting the watercraft .............................. 59
Steering system ................................. 28, 51
Stern drain plugs ...................................... 49
Stern eyes ................................................ 32
Stopping the engine ................................. 56
Stopping the watercraft ............................ 65
Storage..................................................... 69
Storage compartments ............................. 39
Submerged watercraft .............................. 88
Switches ................................................... 53T
Tachometer .............................................. 35
Telescopic steering system ...................... 29
Throttle lever ...................................... 27, 50
Throttle lever, checking ............................ 75
Towing the watercraft ............................... 88
Transporting ............................................. 68
Trolling speed, checking .......................... 80
Troubleshooting ....................................... 82
Troubleshooting chart .............................. 82
Turning the watercraft .............................. 64
W
Water separator ....................................... 48
Watercraft characteristics ......................... 15
Water-skiing ............................................. 17
Watertight compartment ........................... 41
Y
Yamaha Security System ......................... 32
Yamaha Security System settings ........... 33
UF2C70E0.book Page 2 Monday, November 3, 2008 10:16 AM