Suzuki LT-A50 User manual

99500-20212-01E
LT-A50

GROUP INDEX
1
FOREWORD
This manual contains an introductory description on
the SUZUKI LT-A50 and procedures for its inspec-
tion/service and overhaul of its main components.
Other information considered as generally known is
not included.
Read the GENERAL INFORMATION section to fa-
miliarize yourself with the vehicle and its mainte-
nance. Use this section as well as other sections as
a guide for proper inspection and service.
This manual will help you know the vehicle better so
that you can assure your customers of fast and reli-
able service.
!
Inexperienced mechanics or mechanics with-
out the proper tools and equipment may not
be able to properly perform the services de-
scribed in this manual. Improper repair may
result in injury to the mechanic and may ren-
der the vehicle unsafe for the rider.
2
3
4
5
GENERAL INFORMATION
* This manual has been prepared on the basis
of the latest specifications at the time of pub-
lication. If modifications have been made since
then, differences may exist between the con-
tent of this manual and the actual vehicle.
* Illustrations in this manual are used to show
the basic principles of operation and work pro-
cedures. They may not represent the actual
vehicle exactly in detail.
* This manual is written for persons who have
enough knowledge, skills and tools, including
special tools, for servicing SUZUKI vehicle. If
you do not have the proper knowledge and
tools, ask your authorized SUZUKI motorcycle
dealer to help you.
cCOPYRIGHT SUZUKI MOTOR CORPORATION 2001
PERIODIC MAINTENANCE
ENGINE
FUEL AND LUBRICATION
SYSTEM
CHASSIS
6
7
ELECTRICAL SYSTEM
SERVICING INFORMATION
8
LT-A50K3/K4 (’03, ’04-MODELS)
9
LT-A50K5 (’05-MODEL)

HOWTO USETHIS MANUAL
TO LOCATE WHATYOU ARE
LOOKING FOR:
1.The text of this manual is divided into sections.
2.The section titles are listed in the GROUP INDEX.
3.Holding the manual as shown at the right will allow you to find
the first page of the section easily.
4.The contents are listed on the first page of each section to
help you find the item and page you need.
COMPONENT PARTS AND WORKTO BE DONE
Under the name of each system or unit, is its exploded view.Work instructions and other service information
such as the tightening torque, lubricating points and locking agent points, are provided.
Example: Front and rear wheel
1Oil seal
2Bearing
3Spacer
4Front wheel hub
5Bearing
6Oil seal
7Front wheel
8Front wheel center cap
9Rear wheel hub
0Rear wheel
ARear wheel center cap
BCenter cap holder
AWheel nut (front and rear)
BFront hub nut
CRear hub nut
FRONT
REAR
"
ITEM N.m kgf.m lb-ft
A28 2.8 20.5
B65 6.5 47.5
C75 7.5 55.0

SYMBOL (FOR USA)
Listed in the table below are the symbols indicating instructions and other information necessary for servic-
ing.The meaning of each symbol is also included in the table.
Torque control required.
Data beside it indicates specified
torque.
Apply oil. Use engine oil unless
otherwise specified.
Apply SUZUKI SUPER GREASE“A”.
99000-25030
Apply THREAD LOCK “1342”.
99000-32050
ApplyTHREAD LOCK SUPER
“1360”.
99000-32130
Apply SUZUKI BOND “1207B”.
99104-31140
Apply THREAD LOCK SUPER
“1303”.
99000-32030
Measure in voltage range.
Measure in current range.
Measure in diode test range.
Measure in continuity test range.
Use special tool.
SYMBOL DEFINITION SYMBOL DEFINITION
Indication of service data.
Apply SUZUKI MOLY PASTE.
99000-25140
Apply molybdenum oil solution.
(Mixture of engine oil and SUZUKI
MOLY PASTE in a ratio of 1:1)

SYMBOL (For the other countries)
Listed in the table below are the symbols indicating instructions and other information necessary for servic-
ing.The meaning of each symbol is also included in the table.
Torque control required.
Data beside it indicates specified
torque.
Apply oil. Use engine oil unless
otherwise specified.
Apply SUZUKI SUPER GREASE“A”.
99000-25010
Apply THREAD LOCK “1342”.
99000-32050
ApplyTHREAD LOCK SUPER
“1360”.
99000-32130
Apply SUZUKI BOND “1207B”.
99000-31140
ApplyTHREAD LOCK SUPER
“1303”.
99000-32030
Measure in voltage range.
Measure in current range.
Measure in diode test range.
Measure in continuity test range.
Use special tool.
SYMBOL DEFINITION SYMBOL DEFINITION
Indication of service data.
Apply SUZUKI MOLY PASTE.
99000-25140
Apply molybdenum oil solution.
(Mixture of engine oil and SUZUKI
MOLY PASTE in a ratio of 1:1)
Apply SUZUKI BOND “1215”
99000-31110

GENERAL INFORMATION 1-1
1
GENERAL INFORMATION
WARNING/CAUTION/NOTE ............................................................. 1- 2
GENERAL PRECAUTIONS .............................................................. 1- 2
SUZUKI LT-A50K2 (2002-MODEL)................................................... 1- 4
SERIAL NUMBER LOCATION ......................................................... 1- 4
FUEL AND OIL RECOMMENDATIONS ........................................... 1- 4
FUEL.............................................................................................. 1- 5
ENGINE OIL .................................................................................. 1- 5
TRANSMISSION OIL .................................................................... 1- 5
BREAK-IN PROCEDURES............................................................... 1- 5
INFORMATION LABELS .................................................................. 1- 6
SPECIFICATIONS............................................................................. 1- 7
COUNTRY OR AREA CODES ......................................................... 1- 8
CONTENTS

1-2 GENERAL INFORMATION
WARNING/CAUTION/NOTE
Please read this manual and follow its instructions carefully. To emphasize special information, the symbol
and the words WARNING, CAUTION and NOTE have special meanings. Pay special attention to the mes-
sages highlighted by these signal words.
!
Indicates a potential hazard that could result in death or injury.
"
Indicates a potential hazard that could result in vehicle damage.
NOTE:
Indicates special information to make maintenance easier or instructions clearer.
Please note, however, that the warnings and cautions contained in this manual cannot possibly cover all
potential hazards relating to the servicing, or lack of servicing, of the vehicle. In addition to the WARNINGS
and CAUTIONS stated, you must use good judgement and basic mechanical safety principles. If you are
unsure about how to perform a particular service operation, ask a more experienced mechanic for advice.
GENERAL PRECAUTIONS
!
* Proper service and repair procedures are important for the safety of the service mechanic and
the safety and reliability of the vehicle.
* When 2 or more persons work together, pay attention to the safety of each other.
* When it is necessary to run the engine indoors, make sure that exhaust gas is forced outdoors.
* When working with toxic or flammable materials, make sure that the area you work in is well-
ventilated and that you follow all of the material manufacturer’s instructions.
* Never use gasoline as a cleaning solvent.
* To avoid getting burned, do not touch the engine, transmission oil and exhaust system until
they have cooled.
* After servicing the fuel, oil or exhaust systems, check all of the lines and fittings related to the
system for leaks.

GENERAL INFORMATION 1-3
"
* If parts replacement is necessary, replace the parts with Suzuki Genuine Parts or their equiva-
lent.
* When removing parts that are to be reused, keep them arranged in an orderly manner so that
they may be reinstalled in the proper order.
* Be sure to use special tools when instructed.
* Make sure that all parts used in reassembly are clean. Lubricate them when specified.
* Use the specified lubricant, bond, or sealant.
* When tightening cylinder head nuts and crankcase screws, tighten the larger sizes first. Al-
ways tighten the bolts and nuts from the inside working out, in a crisscross pattern and to the
specified tightening torque.
* Whenever you remove oil seals, gaskets, packing, O-rings, locking washers, self-locking nuts,
cotter pins, circlips, and certain other parts as specified, be sure to replace them with new
ones. Also, before installing these new parts, be sure to remove any left over material from the
mating surfaces.
* Never reuse a circlip.When installing a new circlip, take care not to expand the end gap larger
than required to slip the circlip over the shaft. After installing a circlip, always ensure that it is
completely seated in its groove and securely fitted.
* Use a torque wrench to tighten fasteners to the specified torque. Wipe off grease and oil if a
thread is smeared with them.
* After reassembling, check parts for tightness and proper operation.
* To protect the environment, do not unlawfully dispose of used motor oil and tires.
* To protect Earth’s natural resources, properly dispose of used vehicle and parts.

1-4 GENERAL INFORMATION
SUZUKI LT-A50K2 (2002-MODEL)
* Difference between photographs and the actual vehicles depends on the markets.
SERIAL NUMBER LOCATION
The frame serial number or V.I.N. (Vehicle Identification Number) 1is stamped on the left side of the frame
pipe.The engine serial number 2is located on the crankcase. These numbers are required especially for
registering the machine and ordering spare parts.
FUEL AND OIL RECOMMENDATIONS
FUEL (For USA and CANADA)
1.Use only unleaded gasoline of at least 87 pump octane ( ) method or 91 octane or higher rated by the
research method.
2.Suzuki recommends that customers use alcohol free, unleaded gasoline whenever possible.
3.Use of blended gasoline containing MTBE (Methyl Tertiary Butyl Ether) is permitted.
4.Use of blended gasoline/alcohol fuel is permitted, provided that the fuel contains not more than 10 %
ethanol. Gasoline/alcohol fuel may contain up to 5 % methanol if appropriate cosolvents and corrosion
inhibitors are present in it.
5.If the performance of the vehicle is unsatisfactory while using blended gasoline/alcohol fuel, you should
switch to alcohol-free unleaded gasoline
6.Failure to follow these guideline could possibly void applicable warranty coverage. Check with your fuel
supplier to make sure that the fuel you intend to use meets the requirements listed above.
LEFT RIGHT
R + M
2

GENERAL INFORMATION 1-5
FUEL (For the other countries)
Gasoline used should be graded 91 octane or higher. An unleaded gasoline is recommended.
ENGINE OIL (For USA)
Use SUZUKI CCI SUPER 2-CYCLE MOTOR LUBRICANT or an
equivalent good quality synthetic based 2-stroke engine oil rated
FC under the JASO classification.
ENGINE OIL (For the other countries)
Use SUZUKI CCI SUPER OIL.
If they are not available, use a good quality 2-stroke engine oil
rated FC under the JASO classification.
TRANSMISSION OIL
Use a good quality SAE 10W-40 multi-grade motor oil.
BREAK-IN PROCEDURES
During manufacturing only the best possible materials are used and all machined parts are finished to a very
high standard. It is still necessary to allow the moving parts to “BREAK-IN” before subjecting the engine to
maximum stresses. The future performance and reliability of the engine depends on the care and restraint
exercised during its early life. Refer to the following throttle position recommendations.
• Keep to these break-in throttle position.
Up to 10 hours: Below ##
##
#throttle

1-6 GENERAL INFORMATION
INFORMATION LABELS
No LABEL or PLATE NAME APPLIED SPECIFICATION
P02 P03 P28
1 Certification plate
2 Compliance label
3 Manual notice label
4 Parking brake label E
5 Parking brake label F
6 Tire pressure label E
7 Tire pressure label F
8 General warning label E
9 General warning label F
10 No-passenger label
11 Age. 6 label E
12 Age. 6 label F
13 Approval label
14 EC mark label
15 ICES Canada label
16 Fuel caution label
E: English F: French

GENERAL INFORMATION 1-7
SPECIFICATIONS
DIMENSIONS AND DRY MASS
Overall length ................................................................... 1 260 mm (49.6 in)
Overall width .................................................................... 760 mm (29.9 in)
Overall height ................................................................... 745 mm (29.3 in)
Wheelbase ....................................................................... 825 mm (32.5 in)
Ground clearance ............................................................ 120 mm (4.7 in)
Seat height ....................................................................... 535 mm (21.1 in)
Front track ........................................................................ 575 mm (22.6 in)
Rear track ........................................................................ 575 mm (22.6 in)
Dry mass .......................................................................... 71 kg (156 lbs)
ENGINE
Type.................................................................................. Two-stroke, air-cooled
Intake system ................................................................... Piston valve
Number of cylinders ......................................................... 1
Bore × Stroke ................................................................... 41.0 × 37.8 mm (1.61 × 1.49 in)
Displacement ................................................................... 49 cm3(3.0 cu. in)
Corrected compression ratio ........................................... 5.6 : 1
Carburetor ........................................................................ MIKUNI VM12SC, single
Air cleaner ........................................................................ Polyurethane foam element
Idle speed ........................................................................ 1 800 ± 100 r/min
TRANSMISSION
Transmission .................................................................... 2.416 (29/12)
Primary reduction ............................................................ 2.650 (53/20)
Final reduction ................................................................. 3.700 (37/10)
Drive chain ....................................................................... D.I.D. 420
CHASSIS
Front suspension ............................................................. Independent, swing axle, coil spring, oil damped
Rear suspension .............................................................. Swingarm, coil spring, oil damped
Front wheel travel ............................................................. 52 mm (2.0 in)
Rear wheel travel ............................................................. 51 mm (2.0 in)
Caster .............................................................................. 3°
Trail................................................................................... 10 mm (0.39 in)
Camber ............................................................................ 0°
Steering angle ................................................................. 35°
Turning radius .................................................................. 2.0 m (6.6 ft)
Front brake ....................................................................... Drum brake
Rear brake ....................................................................... Drum brake
Front tire size ................................................................... AT16 × 8-7 tubeless
Rear tire size .................................................................... AT16 × 8-7 tubeless
ELECTRICAL
Ignition type ..................................................................... Electronic ignition (CDI)
Ignition timing ................................................................... 24° B.T.D.C. at 3 000 r/min
Spark plug ........................................................................ NGK BPR-4H
CAPACITIES
Fuel tank .......................................................................... 2.6 L (0.7/0.6 US/Imp gal)
Engine oil tank ................................................................. 0.5 L (0.53/0.44 US/Imp qt)
Transmission oil ............................................................... 500 ml (0.53/0.44 US/Imp qt)

1-8 GENERAL INFORMATION
COUNTRY OR AREA CODES
The following codes stand for the applicable country(-ies) and area(-s).
CODE COUNTRY or AREA
P-02 UK
P-03 USA
P-28 Canada

PERIODIC MAINTENANCE 2-1
2
PERIODIC MAINTENANCE
CONTENTS
PERIODIC MAINTENANCE SCHEDULE.........................................2- 2
PERIODIC MAINTENANCE CHART.............................................2- 2
LUBRICATION POINTS ................................................................2- 3
MAINTENANCE ANDTUNE-UP PROCEDURE...............................2- 4
AIR CLEANER ..............................................................................2- 4
CYLINDER HEAD AND CYLINDER .............................................2- 5
SPARK PLUG................................................................................2- 6
THROTTLE CABLE PLAY.............................................................2- 7
ENGINE IDLE SPEED...................................................................2- 7
FUEL HOSE ..................................................................................2- 7
TRANSMISSION OIL ....................................................................2- 8
DRIVE CHAIN................................................................................2- 8
BRAKES........................................................................................2-10
TIRES ............................................................................................2-11
SUSPENSION ...............................................................................2-12
STEERING.....................................................................................2-12
EXHAUST PIPE BOLT AND MUFFLER BOLT .............................2-13
SPARK ARRESTER ......................................................................2-13
CHASSIS BOLTS AND NUTS.......................................................2-14
INITIAL ENGAGEMENT AND CLUTCH LOCK-UP INSPECTION...2-16
INITIAL ENGAGEMENT INSPECTION .........................................2-16
CLUTCH LOCK-UP INSPECTION ................................................2-17

2-2 PERIODIC MAINTENANCE
Interval Initial Every Every
Item 1 month 3 months 6 months
Air cleaner – C –
Cylinder head, cylinder and muffler – C C
Spark plug – C R
Throttle cable I I I
Idle speed I I I
Fuel line I I I
Replace every 4 years
Transmission oil R – R
Drive chain Clean, lubricate and inspect
each time the motorcycle is ridden.
Brakes I I I
Tires Inspect every month
Suspension – – I
Steering I I I
Exhaust pipe bolt and muffler bolt T T T
Spark arrester – – C
Chassis bolts and nuts T T T
PERIODIC MAINTENANCE SCHEDULE
The chart below lists the recommended intervals for all the required periodic service work necessary to keep
the vehicle operating at peak performance and economy. Maintenance intervals are expressed in terms of
kilometers, miles and months, and are dependent on whichever comes first.
NOTE:
More frequent servicing may be performed on vehicle that are used under severe conditions.
PERIODIC MAINTENANCE CHART
NOTE:
Inspect: Inspect and clean, adjust, replace or lubricate as necessary.
C: Clean R: Replace T:Tighten

PERIODIC MAINTENANCE 2-3
Drive chain
Brake cable
Steering shaft holder
Trottle cable
Trottle lever
LUBRICATION POINTS
Proper lubrication is important for smooth operation and long life of each working part of the vehicle.
Major lubrication points are indicated below.
NOTE:
* Before lubricating each part, clean off any rusty spots and wipe off any grease, oil, dirt or grime.
* Lubricate exposed parts which are subject to rust, with a rust preventative spray especially whenever the
vehicle has been operated under wet or rainy condition.

2-4 PERIODIC MAINTENANCE
MAINTENANCE ANDTUNE-UP PROCEDURES
This section describes the servicing procedures for each item in the Periodic Maintenance chart.
•Fill a container with a non-flammable cleaning solvent.
•Immerse the air cleaner element in the cleaning solvent and
wash it.
•Squeeze the cleaning solvent out of the washed element by
pressing it between the palms of both hands: do not twist or
wring the element or it will develop tears.
•Immerse the element in motor oil and squeeze the oil out of the
element leaving it slightly wet with oil.
!
Inspect the air cleaner element for tears. A torn element
must be replaced.
ANon-flammable cleaning solvent
BMotor oil SAE #30
AIR CLEANER
Clean every 3 months.
If the air cleaner is clogged with dust, intake resistance will be
increase, resulting in a decrease in engine output and an increase
in fuel consumption.Clean the air cleaner element in the following
manner.
•Remove the right frame cover. ("5-2)
•Remove the clamp 1and air cleaner cover 2.
•Remove the element.
A
B

PERIODIC MAINTENANCE 2-5
•Reinstall the cleaned air cleaner element in the reverse order of
removal.
!
* Be sure to position the element snugly and correctly,
so that no incoming air will by-pass it. Remember, the
rapid wear of piston rings and the cylinder bore is of-
ten caused by a defective or poorly fitted element.
!
If driving under dusty conditions, clean the air cleaner
element more frequently. The surest way to accelerate
engine wear is to operate the engine without the element
or to use a torn element. Make sure that the air cleaner is
in good condition at all times. The life of the engine de-
pends largely on this component!
CYLINDER HEAD AND CYLINDER
Remove carbon every 3 months.
("3-13) Carbon

2-6 PERIODIC MAINTENANCE
0.5 – 0.6 mm
(0.020 – 0.024 in)
SPARK PLUG
Clean every 3 months.
Replace every 6 months.
Neglecting the spark plug maintenance will eventually leads to
difficult starting and poor engine performance.If the spark plug is
used for a long period, the electrode gradually burns away and
carbon builds up along the inside part of the spark plug.In accor-
dance with the Periodic Maintenance chart, the spark plug should
be inspected, cleaned and regapped at the recommended inter-
vals.
•Disconnect the spark plug cap 1and remove the spark plug
2.
#09930-10121: Spark plug socket wrench set
•Carbon deposits on the spark plug will prevent good sparking
and may cause the engine to misfire. Be sure to clean the car-
bon deposits off periodically.
•If the center electrode is fairly worn down, the spark plug should
be replaced and the spark plug gap set to the specification us-
ing a thickness gauge.
#09900-20804:Thickness gauge
$Spark plug gap: 0.5 – 0.6 mm (0.020 – 0.024 in)
•Check the spark plug for burns.If any abnormalities are found,
replace the spark plug as indicated below.
NGK
STD BPR4H
!
Confirm the thread size and reach when replacing the
spark plug. If the reach is too short, carbon will be de-
posited on the screw portion of the plug hole and engine
damage may result.
!
Before using a spark plug wrench, carefully turn the spark
plug by finger into the threads of the cylinder head to
prevent damage.
•Tighten the spark plug to the using the special tool.
#09930-10121: Spark plug socket wrench set

PERIODIC MAINTENANCE 2-7
ENGINE IDLE SPEED
Inspect initially at 1 month and every 3 months thereaf-
ter.
•Adjust the throttle cable play. (See above.)
•Warm up the engine.
NOTE:
Make this adjustment when the engine is hot.
•Start the engine, turn the throttle stop screw 1and set the en-
gine idle speed as follows.
$Engine idle speed: 1 700 – 1 900 r/min
THROTTLE CABLE PLAY
Inspect initially at 1 month and every 3 months thereaf-
ter.
Throttle cable play Ashould be 3 –5 mm (0.12 –0.20 in) as
measured at throttle when turning the throttle lightly.If the play A
is incorrect, adjust it as follows:
•Loosen the locknut 1and turn the adjuster 2in or out until
the specified play is obtained.
•Tighten the locknut 1while holding the adjuster 2.
$Throttle cable play A: 3 – 5 mm (0.12 – 0.20 in)
%
After the adjustment is completed,check that handlebars
movement does not raise the engine idle speed and that
the throttle lever returns smoothly and automatically.
FUEL HOSE
Inspect initially at 1 month and every 3 months thereaf-
ter. Replace every 4 years.