
E
4
EJU10860 
MAINTENANCE AND 
CARE 
Storage ...................................................... 4-1
Flushing the cooling system  .................. 4-1
Lubrication .............................................. 4-3
Fuel system ............................................ 4-3
Battery .................................................... 4-5
Cleaning the watercraft .......................... 4-6
Maintenance and adjustments .............. 4-7
Owner’s/Operator’s Manual and 
tool kit  ..................................................... 4-8
Periodic maintenance chart  ................... 4-9
Inspecting the fuel system  ................... 4-10
Inspecting the oil injection system ....... 4-11
Inspecting the jet thrust nozzle 
angle ..................................................... 4-12
Inspecting and adjusting the 
throttle cable ......................................... 4-12
Inspecting the QSTS mechanism  ....... 4-13
Cleaning and adjusting the 
spark plugs  ........................................... 4-14
Lubrication points  ................................. 4-15
Inspecting the battery  .......................... 4-18
Adjusting the fuel injection system  ...... 4-20
Replacing the fuse  ............................... 4-21
Bleeding the oil injection pump ............ 4-21
Adjusting the Yamaha Adjustable 
Sponson (Y.A.S.)  ................................. 4-22
Specifications ........................................ 4-23
UF1G70.book  Page 1  Wednesday, December 18, 2002  3:35 PM 

4-21
E
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. 
@ 
EJU11120 
Bleeding the oil injection 
pump  
If the oil tank becomes completely empty,
or any hose connected to the oil pump has
been disconnected, the oil pump must be
bled to ensure proper oil flow. 
If bleeding of the oil pump is necessary,
have a Yamaha dealer bleed it. Fuse amperage: 
20 A (main) 
3 A (meter) 
3 A (bilge pump)
UF1G70.book  Page 21  Wednesday, December 18, 2002  3:35 PM 

5-1
E
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-*** TROUBLE POSSIBLE CAUSE REMEDY PAGE
Engine does not 
startStarter motor does not turn over
Engine shut-
off switchClip not in place Install clip
2-7
Fuse Burned out Replace the fuse and 
check wiring4-21
Battery Run down Recharge 4-18
Poor terminal connec-
tionsTighten as required
4-18
Terminal corroded Clean—
Starter motor Faulty Have serviced by 
Yamaha dealer—
War ning 
systemOverheat mode Cool down engine
2-12
Starter motor turns over
Throttle lever Squeezed Release 2-7
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 4-14
Spark plug cap Not connected or loose Connect properly 4-14
Crankcase Filled with water Crank engine with plug 
out until clean5-8
Fuel injection 
systemFuel pump faulty Have serviced by 
Yamaha dealer—
Water 
temperature 
sensorFailed Have serviced by 
Yamaha dealer 2-12
UF1G70.book  Page 1  Wednesday, December 18, 2002  3:35 PM 

6-2
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J
Jet unit................................................... 3-12
Jumping the battery................................. 5-5
L
Label location .......................................... 1-3
Learning to operate your watercraft ...... 3-19
Leaving the watercraft ........................... 3-18
Limitations on who may operate 
the watercraft .......................................... 1-9
Location of main components ................. 2-1
Lubrication............................................... 4-3
Lubrication points .................................. 4-15
M
Maintenance and adjustments ................ 4-7
Manufactured date label.......................... 1-2
Multifunction information center ... 2-15, 3-13
O
Oil filter .................................................. 4-11
Oil tank .................................................. 4-11
Oil tank filler cap...................................... 2-6
Oil warning indicator.............................. 2-18
Operating your watercraft...................... 3-19
Operation .............................................. 3-14
Operation of controls and 
other functions......................................... 2-5
Operation requirements ........................ 1-11
Other labels ............................................. 1-7
Owner’s/Operator’s Manual and 
tool kit ...................................................... 4-8
P
Periodic maintenance chart..................... 4-9
Post-operation checks........................... 3-31
Pre-operation check list........................... 3-6
Pre-operation check points ..................... 3-7
Pre-operation checks .............................. 3-6
Primary Identification (PRI-ID) 
number .................................................... 1-1
Q
Quick Shift Trim System (QSTS) 
selector.................................................. 2-10R
Recommended equipment .................... 1-13
Replacing the fuse ................................ 4-21
Riding watercraft with a passenger ....... 3-20
Rough water operation .......................... 3-30
S
Safe boating rules ................................. 1-16
Safety information ................................... 1-9
Seat ......................................................... 2-5
Specifications ........................................ 4-23
Speedometer......................................... 2-16
Starting and boarding in 
shallow water ........................................ 3-22
Starting from a dock .............................. 3-22
Starting the engine ................................ 3-16
Starting the watercraft ........................... 3-21
Start switch.............................................. 2-8
Steering system .............................2-9, 3-11
Stopping the engine .............................. 3-18
Stopping the watercraft ......................... 3-29
Storage.................................................... 4-1
Storage compartments .......................... 2-20
Submerged watercraft ............................. 5-8
Switches ................................................ 3-13
T
Tachometer ........................................... 2-16
Throttle .................................................. 3-11
Throttle lever ........................................... 2-7
Towing the watercraft .............................. 5-7
Transporting .......................................... 3-33
Troubleshooting ...................................... 5-1
Troubleshooting chart ............................. 5-1
Turning the watercraft ........................... 3-27
W
Warning labels ........................................ 1-4
Watercraft characteristics ...................... 1-14
Water separator ...................................... 3-8
Y
Yamaha Adjustable Sponson 
(Y.A.S.).................................................. 2-21
Yamaha Engine Management 
System (YEMS) ..................................... 2-14
UF1G70.book  Page 2  Wednesday, December 18, 2002  3:35 PM