Kawasaki KX250F - User manual

KX250F

Motorcycle

Service Manual

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 j

Periodic Maintenance 2 j

Fuel System (DFI) 3 j

Cooling System 4 j

Engine Top End 5 j

Clutch 6 j

Engine Lubrication System 7 j

Engine Removal/Installation 8 j

Crankshaft/Transmission 9 j

Wheels/Tires 10 j

Final Drive 11 j

Brakes 12 j

Suspension 13 j

Steering 14 j

Frame 15 j

Electrical System 16 j

Appendix 17 j

KX250F

Motorcycle

Service Manual

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 i t 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 Motorcycle 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.

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 r/min, 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) (mass) W watt(s)

h hour(s) Ω ohm(s)

kg (mass)

kgf (force)

L liter(s)

COUNTRY AND AREA CODES

AU Australia EUR Europe

BR Brazil

US United States

CA Canada

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 m ake 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.

To get the longest life out of your vehicle:

•

Follow the Periodic Maintenance Chart i n the

Service Manual.

•

Be alert for problems and non-scheduled

maintenance.

•

Use proper tools and genuine Kawasaki Mo-

torcycle parts. Special tools, gauges, and

testers that are necessary when servicing

Kawasaki motorcycles are introduced 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 stick coil information,

use the Quick Reference Guide to locate the

Electrical System chapter. Then, use the Table

of Contents on the first page of the chapter to

find the Stick 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 m anual contains four more symbols

which will help you distinguish different types

of information.

NOTE

○

This note symbol indicates po ints 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.

GENERAL INFORMATION 1-1

1

General Information

Table of Contents

Before Servicing ..................................................................................................................... 1-2

Model Identification................................................................................................................. 1-7

General Specifications............................................................................................................ 1-8

Technical Information - Dual Injector ...................................................................................... 1-11

Unit Conversion Table ............................................................................................................ 1-13

1-2 G ENERAL INFORMATION

Before Servicing

Before starting to perform an inspection service or carry out a disassembly and reassembly opera-

tion on a motorcycle, read the precautions given below. To facilitate actual operations, notes, illustra-

tions, photographs, cautions, and detailed descriptions have been included in each chapter wherever

necessary. This section explains the items that require particular attention during the removal and

reinstallation or disassembly and reassembly of general parts.

Especially note the following:

Edges of Parts

Lift large or heavy parts wearing gloves to prevent injury

from possible sharp edges on the parts.

Solvent

Use a high-flash point solvent when cleaning parts. High

-flash point solvent should be used according to directions

of the solvent manufacturer.

Cleaning Vehicle before Disassembly

Clean the vehicle thoroughly before disassembly. Dirt or

other foreign materials entering into sealed areas during ve-

hicle disassembly can cause excessive wear and decrease

performance of the vehicle.

Arrangement and Cleaning of Removed Parts

Disassembled parts are easy to confuse. Arrange the

parts according to the order the parts were disassembled

and clean the parts in order prior to assembly.

GENERAL INFORMATION 1-3

Before Servicing

Storage of Remov ed Parts

After all the parts including subassembly parts have been

cleaned, store the parts in a clean area. Put a clean cloth

or plastic sheet over the parts to protect from any foreign

materials that may collect before re-assembly.

Inspection

Reuse of worn or damaged parts may lead to serious ac-

cident. Visually inspect removed parts for corrosion, discol-

oration, or other damage. Refer to the appropriate sections

of this manual for service limits on individual parts. Replace

the parts if any damage has been found or if the part is be-

yond its service limit.

Replacement Parts

Replacement parts must be KAWASAKI genuine or

recommended by KAWASAKI. G askets, O-rings, oil seals,

grease seals, circlips, cotter pins or self-locking nuts must

be replaced with new ones whenever disassembled.

Assembly Order

In most cases assembly order is the reverse of disassem-

bly, however, if assembly order is provided in this Service

Manual, follow the procedures given.

Tightening Sequence

Generally, when installing a part with s everal bolts, nuts,

or screws, start them all in their holes and tighten them to

a snug fit. Then tighten them according to the specified se-

quence to prevent case warpage or deformation which can

lead to malfunction. Conversely when loosening the bolts,

nuts, or screws, first loosen all of them by about a quar-

ter turn and then remove them. If the specified tightening

sequence is not indicated, tighten the fasteners alternating

diagonally.

1-4 G ENERAL INFORMATION

Before Servicing

Tightening Torque

Incorrect torque applied to a bolt, nut, or screw may

lead to serious damage. Tighten fasteners to the specified

torque using a good quality torque wrench. Often, the

tightening sequence is followed twice-initial tightening and

final tightening with torque wrench.

Force

Use common sense during disassembly and assembly,

excessive force can cause expensive or hard to repair dam-

age. When necessary, remove screws that have a non

-permanent locking agent applied using an impact driver.

Use a plastic-faced mallet whenever tapping is necessary.

Gasket, O-ring

Hardening, shrinkage, or damage of both gaskets

and O-rings after disassembly can reduce sealing per-

formance. Remove old gaskets and clean the sealing

surfaces thoroughly so that no gasket material or other

material remains. Install new gaskets and replace used

O-rings when re-assembling.

Liquid Gasket, Non-permanent Locking Agent

For applications that require Liquid Gasket or a

Non-permanent Locking Agent, clean the surfaces so

that no oil residue remains before applying liquid gasket or

non-permanent locking agent. Do not apply them exces-

sively. Excessive application can clog oil passages and

cause serious damage.

Press

For items such as bearings or oil seals that must be

pressed into place, apply small amount of oil to the con-

tact area. Be sure to maintain proper alignment and use

smooth movements when installing.

GENERAL INFORMATION 1-5

Before Servicing

Ball Bearing and Needle Bearing

Do not remove pressed ball or needle unless removal is

absolutely necessary. Replace with new ones whenever

removed. Press bearings with the manufacturer and size

marks facing out. Press the bearing into place b y putting

pressure on the correct bearing race as shown.

Pressing the incorrect race can cause pressure between

the inner and outer race and result in bearing damage.

Oil Seal, Grease Seal

Do not remove pressed oil or grease seals unless removal

is necessary. Replace with new ones whenever removed.

Press new oil seals with manufacture and size marks facing

out. Make sure the seal is aligned properly when installing.

Apply specified grease to the lip of seal before installing

the seal.

Circlips, Cotter Pins

Replace circlips or cotter pins that were removed with new

ones. Take care not to open the clip excessively when in-

stalling to prevent deformation.

Lubrication

It is important to lubricate rotating or sliding parts during

assembly to minimize wear during initial operation. Lubri-

cation points are called out throughout this manual, apply

the specific oil or grease as specified.

1-6 G ENERAL INFORMATION

Before Servicing

Direction of Engine Rotation

When rotating the crankshaft by hand, the free play

amount of rotating direction will affect the adjustment. Ro-

tate the crankshaft to positive direction (clockwise viewed

from output side).

Electrical Leads

A two-color lead is identified first by the primary color and

then the stripe color. Unless instructed o therwise, electrical

leads must be connected to those of the same color.

Instrument

Use a meter that has enough accuracy for an accurate

measurement. Read the manufacture’s instructions thor-

oughly before using the meter. Incorrect values may lead

to improper adjustments.

GENERAL INFORMATION 1-7

Model Identification

KX250YB Left Side View

KX250YB Right Side View

Frame Number Engine Number

1-8 G ENERAL INFORMATION

General Specifications

Items KX250YB ∼ YC

Dimensions

Overall Length 2 170 mm (85.43 in.)

Overall Width 820 mm (32.3 in.)

Overall Height 1 270 mm (50.00 in.)

Wheelbase 1 475 mm (58.07 in.)

Road Clearance 330 mm (13.0 in.)

Seat Height 945 mm (37.2 in.)

Curb Mass:

KX250YB 105.7 kg (233.1 lb)

(US, CA) 105.6 kg (232.8 lb)

KX250YC 106.2 kg (234.2 l b)

(US, CA) 106.1 kg (234.0 lb)

Front:

KX250YB 51.6 kg (113.8 lb)

KX250YC 51.9 kg (114.4 lb)

Rear:

KX250YB

54.1 kg (119.3 lb)

(US, CA) 54.0 kg (119.1 lb)

KX250YC 54.3 kg (119.7 lb)

(US, CA) 54.2 kg (119.5 lb)

Fuel Tank Capacity 7.2 L (1.9 US gal)

Engine

Type 4-stroke, single cylinder, DOHC 4 valve

Cooling System Liquid-cooled

Bore and Stroke 77.0 × 53.6 mm (3.03 × 2.11 in.)

Displacement 249 cm³ (15.2 cu in.)

Compression Ratio 13.5 : 1

Fuel System FI (Fuel Injection), KEIHIN 43

Starting System Primary kick

Ignition System Digital DC-CDI

Timing Advance Electronically advanced

Ignition Timing BTDC 4° @2 000 r/min (rpm)

Spark Plug:

Standard NGK CPR8EB-9

Option NGK CPR9EB-9

Valve Timing:

Intake:

Open BTDC 40°

Close ABDC 72°

Duration

292°

Exhaust:

Open BBDC 69°

Close ATDC 49°

Duration 298°

Lubrication System Forced lubrication (semi-dry sump)

GENERAL INFORMATION 1-9

General Specifications

Items KX250YB ∼ YC

Engine Oil:

Grade API SG, SH, SJ, SL or SM with JASO MA, MA1 or MA2

Viscosity SAE 10W-40

Capacity 1.0 L (1.1 US qt)

Drive Train

Primary Reduction System:

Type

Gear

Reduction Ratio

3.350 (67/20)

Clutch Type Wet m ulti disc, Manual

Transmission:

Type

5-speed, constant mesh, return shift

Gear Ratios:

1st 2.142 (30/14)

2nd 1.750 (28/16)

3rd 1.444 (26/18)

4th

1.235 (21/17)

5th

1.045 (23/22)

Final Drive System:

Type Chain drive

Reduction Ratio 3.846 (50/13)

(EUR, BR) 3.769 (49/13)

Overall Drive Ratio 13.470 @Top gear

(EUR, BR) 13.201 @Top gear

Frame

Type Tubular, semi-double cradle

Steering Angle 42° to either side

Caster (Rake Angle) 28.2°

Trail

120.2 mm (4.732 in.)

Front Wheel:

Tire Size 80/100-21 51M

Tire Make/T ype BRIDGESTONE M403, Tube type

Rim Size

21 × 1.60

Rear Wheel:

Tire Size 100/90-19 57M

Tire Make/T ype BRIDGESTONE M404, Tube type

Rim Size 19 × 1.85

Front Suspension:

Type Telescopic fork (upside down)

Wheel Travel 315 mm (12.4 in.)

Rear Suspension:

Type

Swingarm (New Uni-trak)

Wheel Travel 310 mm (12.2 in.)

Brake Type:

Front and Rear

Single disc

1-10 GENERAL INFORMATION

General Specifications

Items KX250YB ∼ YC

Effective Disc Diameter:

Front 225 mm (8.86 in.)

Rear 215 mm (8.46 in.)

Specifications are subject to change without notice, and may not apply to every country.

GENERAL INFORMATION 1-11

Technical Information - Dual Injector

Overview

Although the Kawasaki Ninja super-sports models are already equipped with dual injectors, the

2012 KX250YC is the first motocross model to adopt dual-injector technology. The dual injectors are

installed in the throttle body and intake duct.

The injector in the throttle body is the Downstream Injector. The injector in the intake duct is the

Upstream Injector.

By using two injectors, power feeling has improved in the middle to high speed range compared to

conventional models (single injector type).

1. Downstream Injector

2. Throttle Body Assy

3. Upstream Injector

4. Intake Duct

Downstream Injector [A]

Upstream Injector [B]

Fuel Injection

Fuel injection is controlled by the ECU based on the throt-

tle opening and engine speed. In the low speed range, the

downstream injector alone will operate, and in the middle

to high speed range, both the downstream and upstream

injectors will operate.

The shaded field in the image below shows the fue

linjec-

tion field of both injectors and the rest of the field s hows the

fuel injection field of the downstream injector.

1-12 GENERAL INFORMATION

Technical Info rmation - Dual Injector

Image of the fuel injection field

A. Throttle Opening

B. Engine Speed

C. Fuel Injection Field of Both Injector

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