
STX-15F
JET SKI
®
Watercraft
Service Manual

is a trademark of Kawasaki Heavy Industries, Ltd. registered in U.S.A., Japan,
Austria, Benelux, Sweden, Denmark, Switzerland, France, Canada, Finland, Norway, Greece, Italy,
U.K., Portugal, Thailand, and Taiwan.
KAWASAKI JET SKI
®
is a trademark of Kawasaki Heavy Industries, Ltd. registered in Australia.

This quick reference guide will assist
you in locating a desired topic or pro-
cedure.
•Bend the pages back to match the
black tab of the desired chapter num-
ber with the black tab on the edge at
each table of contents page.
•Refer to the sectional table of contents
for the exact pages to locate the spe-
cific topic required.
Quick Reference Guide
General Information 1
Periodic Maintenance 2
Fuel System (DFI) 3
Engine Lubrication System 4
Exhaust System 5
Engine Top End 6
Engine Removal/Installation 7
Engine Bottom End 8
Cooling and Bilge Systems 9
Drive System 10
Pump and Impeller 11
Steering 12
Hull/Engine Hood 13
Electrical System 14
Storage 15
Appendix 16


STX-15F
JET SKI
®
Watercraft
Service Manual
All rights reserved. No parts of this publication may be reproduced, stored in a retrieval system, or
transmitted in any form or by any means, electronic mechanical photocopying, recording or otherwise,
without the prior written permission of Quality Assurance Division/Motorcycle & Engine Company/Kawasaki
Heavy Industries, Ltd., Japan.
No liability can be accepted for any inaccuracies or omissions in this publication, although every possible
care has been taken to make it as complete and accurate as possible.
The right is reserved to make changes at any time without prior notice and without incurring an obligation
to make such changes to products manufactured previously. See your JET SKI
®
watercraft dealer for the
latest information on product improvements incorporated after this publication.
All information contained in this publication is based on the latest product information available at the time
of publication. Illustrations and photographs in this publication are intended for reference use only and may
not depict actual model component parts.
© 2003 Kawasaki Heavy Industries, Ltd. 10th Edition (2):May 20, 2012

LIST OF ABBREVIATIONS
A ampere(s) lb pound(s)
ABDC after bottom dead center m meter(s)
AC alternating current min minute(s)
ATDC after top dead center N newton(s)
BBDC before bottom dead center Pa pascal(s)
BDC bottom dead center PS horsepower
BTDC before top dead center psi pound(s) per square inch
°C degree(s) Celsius r revolution
DC direct current rpm revolution(s) per minute
F farad(s) TDC top dead center
°F degree(s) Fahrenheit TIR total indicator reading
ft foot, feet V volt(s)
g gram(s) W watt(s)
h hour(s) Ω ohm(s)
L liter(s)
COUNTRY AND AREA CODES
AU Australia FR France
CA Canada US United States
EUR Europe

MAINTENANCE AND ADJUSTMENTS
Maintenance, replacement, or repair of the emission control devices and systems may
be performed by any marine Sl engine repair establishment or individual.
EMISSION CONTROL INFORMATION
Fuel Information
THIS ENGINE IS CERTIFIED TO OPERATE ON UNLEADED GRADE GASOLINE ONLY with
an octane rating equal to or higher than that shown below.
Minimum Octane Rating: Antiknock Index* 87
Research Octane Number (RON) 91
*: The Antiknock Index is an average of the Research Octane Number (RON) and the Motor Octane
Number (MON).
Emission Control Information
To protect the environment in which we all live, Kawasaki has incorporated an exhaust emis-
sion control system in compliance with applicable regulations of the United States Environmental
Protection Agency.
Exhaust Emission Control System
This system reduces the amount of pollutants discharged into the atmosphere by the exhaust
of this engine. The fuel, ignition and exhaust systems of this engine have been carefully de-
signed and constructed to ensure an efficient engine with low exhaust pollutant levels.
Maintenance
Proper maintenance and repair are necessary to ensure that watercraft will continue to have
low emission levels. This Service Manual contains those maintenance and repair recommenda-
tions for this engine. Those items identified by the Periodic Maintenance Chart are necessary
to ensure compliance with the applicable standards.
Tampering with Emission Control System Prohibited
Federal law prohibits the following acts or the causing thereof: (1) the removal or rendering
inoperative by any person other than for purposes of maintenance, repair, or replacement, of
any device or element of design incorporated into any new engine for the purposes of emission
control prior to its sale or delivery to the ultimate purchaser or while it is in use, or (2) the use
of the engine after such device or element of design has been removed or rendered inoperative
by any person.
Among those acts presumed to constitute tampering are the acts listed below:
Do not tamper with the original emission related parts.
* Digital Transistor Ignition System
* Fuel Pump
* Spark Plugs
* Throttle Body and Internal Parts
* Fuel Injectors
* ECU

Foreword
This manual is designed primarily for use by
trained mechanics in a properly equipped shop.
However, it contains enough detail and basic in-
formation to make it useful to the owner who de-
sires to perform his own basic maintenance and
repair work. A basic knowledge of mechanics,
the proper use of tools, and workshop proce-
dures must be understood in order to carry out
maintenance and repair satisfactorily. When-
ever the owner has insufficient experience or
doubts his ability to do the work, all adjust-
ments, maintenance, and repair should be car-
ried out only by qualified mechanics.
In order to perform the work efficiently and
to avoid costly mistakes, read the text, thor-
oughly familiarize yourself with the procedures
before starting work, and then do the work care-
fully in a clean area. Whenever special tools or
equipment are specified, do not use makeshift
tools or equipment. Precision measurements
can only be made if the proper instruments are
used, and the use of substitute tools may ad-
versely affect safe operation.
For the duration of the warranty period,
we recommend that all repairs and scheduled
maintenance be performed in accordance with
this service manual. Any owner maintenance or
repair procedure not performed in accordance
with this manual may void the warranty.
To get the longest life out of your JET SKI
®
watercraft:
•
Follow the Periodic Maintenance Chart in the
Service Manual.
•
Be alert for problems and non-scheduled
maintenance.
•
Use proper tools and genuine Kawasaki JET
SKI
®
watercraft parts. Special tools, gauges,
and testers that are necessary when servic-
ing Kawasaki JET SKI
®
watercraft are intro-
duced by the Service Manual. Genuine parts
provided as spare parts are listed in the Parts
Catalog.
•
Follow the procedures in this manual care-
fully. Don’t take shortcuts.
•
Remember to keep complete records of main-
tenance and repair with dates and any new
parts installed.
How to Use This Manual
In this manual, the product is divided into
its major systems and these systems make up
the manual’s chapters. The Quick Reference
Guide shows you all of the product’s system
and assists in locating their chapters. Each
chapter in turn has its own comprehensive Ta-
ble of Contents.
For example, if you want ignition coil informa-
tion, use the Quick Reference Guide to locate
the Electrical System chapter. Then, use the
Table of Contents on the first page of the chap-
ter to find the Ignition Coil section.
Whenever you see symbols, heed their in-
structions! Always follow safe operating and
maintenance practices.
DANGER
DANGER indicates a hazardous situa-
tion which, if not avoided, will result in
death or serious injury.
WARNING
WARNING indicates a hazardous situa-
tion which, if not avoided, could result
in death or serious injury.
NOTICE
NOTICE is used to address practices not
related to personal injury.
This manual contains four more symbols
which will help you distinguish different types
of information.

NOTE
○ This note symbol indicates points of par-
ticular interest for more efficient and con-
venient operation.
•
Indicates a procedural step or work to be
done.
○ Indicates a procedural sub-step or how to do
the work of the procedural step it follows. It
also precedes the text of a NOTE.
Indicates a conditional step or what action to
take based on the results of the test or inspec-
tion in the procedural step or sub-step it fol-
lows.
In most chapters an exploded view illustration
of the system components follows the Table of
Contents. In these illustrations you will find the
instructions indicating which parts require spec-
ified tightening torque, oil, grease or a locking
agent during assembly.
This model, JT1500A, is mounted with a four
-stroke engine.
When the JET SKI
®
watercraft is submerged
and swamped, the four-stroke engine needs
special care and systematic procedure for re-
covery compared with the two-stroke engine.
Therefore in this manual, such procedures,
which are not shown in SMs for two-stroke
engines, are explained thoroughly to cope with
the cases.
Refer to the section, After submerging in
Chapter 9, Cooling and Bilge Systems for the
summary and detailed procedures.

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- This is a comprehensive factory service repair workshop manual for the Kawasaki Jetski STX 15F PWC, covering the years 2004-2013.
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