Baja motorsports WD90UR-2 User manual

WD90UR-2 ATV
Read this manual carefully. It contains important safety information.
Children under the age of 16 should be supervised by a responsible adult.
Always wear a helmet; It could save your Life!
Please obtain, review, and follow provincial / municipal government acts and regulations pertaining to owning
and operating an off-road vehicle.
Minimum Age Requirement -12
OWNER’S MANUAL
Quebec Canada - 14
REV B
052108

II
Congratulations on your purchase of the
WD90UR-2 ATV.
It is warranted to be free of manufacturing defects in the material of
workmanship for a period of 90 days from the date of purchase. During the
warranty period BAJA, INC. will at its option, repair, provide replacement
parts or replace your BAJA INC. 90cc ATV at no charge. This warranty does
not cover normal wear items or damage caused by neglect or misuse of the
product.
Engine Warranty – 90 days
Frame Warranty – 90 days
Warranty is void if:
Frame is bent or broken due to abuse
Wheels are bent or broken
Fender bent or broken due to abuse
Any sign of impact, accident, jumping, spin-outs or roll over.
BAJA, INC. is not liable for any damage claim or liability claim person or
otherwise resulting from the operation of this product in any way.
Should you experience a problem or need to return your 90cc ATV for repair, please
call the BAJA INC. customer service department TOLL FREE at 1-888-863-BAJA (2252)
between the hours of 7am and 5pm Monday thru Friday PST and Saturday 8am to 4pm
PST. During DST hours change to MT. You will be instructed how to proceed.
A COPY OF THE SALES RECEIPT IS REQUIRED.

III
This manual should be considered a permanent part of the vehicle
and should remain with the vehicle when resold or otherwise
transferred to a new user or operator. The manual contains
important safety information and instructions which should be read
carefully before operating the vehicle.
!
The engine exhaust from this product contains
chemicals known to the State of California to cause
cancer, birth defects or other reproductive harm.
CALIFORNIA PROPOSITION 65
! WARNING
! WARNING

1
SAFETY ...............................................................................................................3
IMPORTANT ................................................................................................3
NOTICE TO THE USER...............................................................................4
ATV 90..................................................................................................................7
FUEL AND OIL.....................................................................................................8
LOCATION OF LABELS......................................................................................9
CONTROL FUNCTIONS......................................................................................12
SPEEDOMETER/REARVIEW MIRROR ......................................................12
LEFT HANDLEBAR.....................................................................................13
RIGHT HANDLEBAR...................................................................................13
FUEL VALVE................................................................................................14
FUEL TANK CAP.........................................................................................14
SEAT LOCK .................................................................................................15
RIDING YOUR ATV..............................................................................................16
WHAT YOU SHOULD KNOW BEFORE RIDING ........................................16
INSPECTION BEFORE RIDING..................................................................17
SAFETY GEAR............................................................................................18
BREAK-IN....................................................................................................20
STARTING THE ENGINE.............................................................................21
STARTING OFF ...........................................................................................25
BRAKING.....................................................................................................26
TURNING .....................................................................................................27
SKIDDING OR SLIDING..............................................................................28
OPERATION ON HILLS...............................................................................29
CLIMBING A HILL......................................................................... 30
DESCENDING A HILL................................................................... 31
TRAVERSING A SLOPE................................................................ 32
RIDING OVER OBSTACLES.......................................................................32
RIDING THROUGH WATER ........................................................................33
RIDING IN COLD WEATHER ......................................................................34
DRESSING FOR COLD WEATHER RIDING..................................35
RIDING YOU ATV ON SNOW AND ICE .........................................36
ACCESSORY USE AND VEHICLE LOADING....................................................37
WEIGHT LIMITS.............................................................................. 38
INSPECTION AND MAINTENANCE ...................................................................39
MAINTENANCE SCHEDULE.......................................................................39
TOOLS .........................................................................................................41
SPARK PLUG ..............................................................................................41
BATTERY INSTALLATION ..........................................................................43
ENGINE SPEED GOVERNOR.....................................................................47
THROTTLE LEVER ADJUSTMENT............................................................49
IDLE SPEED ADJUSTMENT.......................................................................50
FUEL HOSE.................................................................................................50
TABLE OF CONTENTS

2
ENGINE OIL.................................................................................................51
CHANGING ENGINE OIL...............................................................52
AIR FILTER ..................................................................................................53
REMOVAL...................................................................................... 54
WASHING.......................................................................................54
DRIVE CHAIN/SPROCKETS.......................................................................56
INSPECTING THE DRIVE CHAIN........................................................56
INSPECTING THE SPROCKETS.........................................................56
DRIVE CHAIN CLEANING, OILING AND ADJUSTING......................57
TIRES...........................................................................................................58
BRAKING.....................................................................................................60
FRONT DRUM BRAKES .....................................................................60
REAR HYDRAULIC DISC BRAKE AND PARKING BRAKE ..............61
GENERAL LUBRICATION...........................................................................62
TROUBLESHOOTING.........................................................................................63
FUEL SUPPLY CHECK................................................................................63
IGNITION SYSTEM CHECK........................................................................64
TRANSPORTING.................................................................................................65
CLEANING PROCEDURE...................................................................................66
PREPARATION FOR CLEANING................................................................66
WASHING YOUR ATV .................................................................................67
INSPECTION AFTER CLEANING...............................................................67
STORAGE PROCEDURE....................................................................................68
SERIAL NUMBER LOCATION............................................................................69
SPECIFICATIONS................................................................................................70
WIRE DIAGRAM...................................................................................................71
EMISSION CONTROL SYSTEM WARRANTY.....................................................72
TABLE OF CONTENTS

3
Please read this manual and follow all instructions carefully. To emphasize the
special information, the symbol and the words WARNING or CAUTION have
some special meanings. Pay great attention to the messages.
NOTE: Indicating special information which is to make maintenance easier or
instructions clearer.
WARNING and CAUTION are arranged like this:
This user’s manual contains important safety and maintenance information. Read
it carefully before riding. Failing to follow the warnings contained in this manual
could result in INJURY or DEATH.
It is important that this manual remain with the vehicle when you transfer it to
another user or owner.

this manual are based on the latest product information available at the time
of publication. Due to improvements or other changes, there will be some
discrepancies in this manual. We reserve the right to make product changes at
any time, without notice and without incurring any obligation to make the same
or similar changes to the vehicle previously built or sold.
WARNING
Indicates a potential hazard that could result in
death or injury.
CAUTION
Indicates a potential hazard that could result in
vehicle damage.
WARNING-or-CAUTION

The second part will describe WHAT COULD HAPPEN if
you ignore the WARNING or CAUTION.
The third part will describe HOW TO AVOID THE

SAFETY

4
We believe in conservation and protection of the earth’s natural resources.
We encourage every vehicle owner and operator to do the same by obeying
posted signs and riding only in areas designated and approved for off-road
recreational use.
NOTICE TO USERS
. An
ATV is different from other vehicles including motorcycles and cars. A collision
or rollover could occur quickly, even during routine maneuvers such as turning
and driving on hills or over obstacles if you fail to take proper precautions.
· Read this manual and labels on the ATV carefully and follow the operations
procedures as described.
· Never operate the ATV without proper instruction. Take a training course.
Beginners should be trained by a licensed instructor. Always follow the
age recommendations
· Never carry a passenger on an ATV.
· Always avoid operating an ATV on paved surfaces, including: sidewalks,
paths, parking lots, driveways, streets, roads, and highways. Never
operate this or any ATV on a public street, road or highway where motor
vehicles are in operation.
· Never operate an ATV without wearing a DOT approved motorcycle helmet

face shield), gloves, boots, long-sleeved shirt or jacket, and long pants.
WARNING
SEVERE INJURY OR DEATH can result if you
do not follow these instructions.
SAFETY

5
· Never operate this ATV at excessive speeds. Always operate at a speed that is
proper for the terrain, visibility, operating conditions, and the operator’s skill /
experience.
· Never attempt wheelies, jumps, or other stunts.
· Always inspect the ATV each time before use to ensure it is in a safe operating
condition. Always follow the inspection and maintenance procedures and
schedule described in this manual.
· Always keep both hands on the handlebar and both feet on the footrests of the
ATV during operation.
· Always go slow and be extremely careful when operating on unfamiliar terrain.
Always be alert to the changing terrain conditions when operating the ATV.
· Never operate on excessively rough, slippery or loose terrain until you have
learned and practiced the necessary skills to control the ATV on such terrain.
· Always follow proper procedures for turning as described in this manual.
Practice turning at low speeds before attempting to turn at faster speeds. Do
not turn at excessive speeds.
· Never operate the ATV on hills that are too steep for the ATV or for the
operator’s ability. Practice on smaller hills before attempting larger hills.
· Always follow the proper procedures for climbing hills as described in this
manual. Check the terrain carefully before you start up any hill. Never climb
hills with excessively slippery or loose surfaces. Shift your weight forward.
Never open the throttle suddenly. Never go over the top of a hill at high
speeds.
· Always follow proper procedures for going down hills as described in this
manual. Check the terrain carefully before starting to go down any hill. Shift
your weight backward. Never go down a hill at an angle that would cause the
vehicle to lean sharply to one side. Go straight down the hill if possible.
· Always follow proper procedures for crossing the side of a hill as described
in this manual. Avoid operation on hills with excessively slippery or loose
surfaces. Shift your weight to the uphill side of the ATV. Never attempt to
turn the ATV around on any hill until you have mastered the turning technique
described in this manual on level ground. Avoid crossing the side of a steep
hill if possible.
SAFETY

6
· Always use proper procedures if you stall or roll backwards when climbing
a hill. To avoid stalling, maintain a steady speed when climbing a hill.
If you stall or roll backwards, follow the special procedure for braking
described in this manual. Dismount on the uphill side or to a side if
pointed straight to uphill. Turn the ATV around and remount, following the
procedure described in this manual.
· Always check for obstacles before operating in a new area. Never attempt
to operate over large obstacles, such as large rocks or fallen trees. Always
follow proper procedures when operating over obstacles as described in
this manual.
· Always be careful when skidding or sliding. Learn to safely control
skidding or sliding by practicing at low speeds and on level, smooth terrain.
On extremely slippery surfaces, such as ice, go slow and be very cautious
in order to avoid going out of control when skidding or sliding.
 

ability. Test your brakes after leaving water. If necessary, apply them
several times to let friction linings dry out.
 
Always maintain proper tire pressure as described in this manual.
· Never modify an ATV through improper installation of accessories.
· Never exceed the stated load capacity for an ATV. Cargo should be
distributed properly and attached securely. Reduce speed and follow
instructions in this manual for carrying cargo. Allow longer distance for
braking.
· The combined weight of the rider and any accessories or cargo must never
exceed the vehicle’s load capacity of 100 Kg (220 lbs.)
· Do not tow a trailer. This vehicle is not designed for such use.
SAFETY

7
[Right]
ATV90
[Left]
Rear Tire
Gas Cap
Seat
Front Rack Rear Rack
Carburetor

Front Tire
Oil cap
Front
shocks
Rear shock
Choke
Tail Light Head lights
Fuel Shut off
Valve
Gas Cap vent
hose
Left side rear
view mirror
Speedometer

8
FUEL
Proper fuel is very important for the engine. Ensure there is no dust, dirt, or
water which has mixed in the fuel. Use regular unleaded gasoline with an
octane number 90 or higher.
ENGINE OIL
Your 90cc ATV has a four-stroke engine. Please use oil as described in the
chart below. By using prescribe oil, you will realize the best lubrication for
engine.
Use the chart to select a viscosity rating based on the temperature range in
your area.
NOTE: In very cold weather (below 5°F (-15°C), use SAE10W-50 for good
starting and smooth operation.
SAE 10W-30
SAE 20W-40
SAE 10W-50
ENGINE
TEMP.
°C
°F
-30
-22
40
104
-20
-4
-10
14
0
32
10
50
20
68
30
86
FUEL AND OIL

9
Read and follow all of the warnings labels on your ATV. Make sure you
understand all the labels. Keep the labels on the ATV. Do not remove them

get a replacement by contacting BAJA INC..
LOCATION OF LABELS
1WARNING/AVERTISSEMENT
NO ONE
UNDER
12
Operation of the ATV by children
under the age of 12 increases the risk
of severe injury or death.
Adult supervision required for
children under age 16.
NEVER permit children under age 12
to operate this ATV.
UNDER
MOINE DE
14
(Quebec Canada)
L’opération du VTT par des enfants
de moins de 12 ans augmente les
risques de BLESSURES GRAVES OU
LA MORT.
Les personnes de moins de 16 ans
ne doivent pas utiliser ce véhicule
sans être supervisées par un adulte.
Ne jamais permettre à un enfant de
moins de 12 ans d’utiliser ce VTT.
1
324
56

10
LOCATION OF LABELS
3
Improper ATV use can result in SEVERE INJURY or DEATH
L’usage inadéquat du VTT peut entraîner des blessures graves ou la mort.
LOCATE AND READ OWNER’S MANUAL CAREFULLY BEFORE OPERATING.
FOLLOW ALL INSTRUCTIONS AND WARNINGS.


WARNING/AVERTISSEMENT
NEVER OPERATE:
Without proper training or instruction.
At speeds too fast for your skills or the
condition.
On public roads, a collision can occur
with another vehicle.
With passenger. Passengers affect
balance and steering and increase risk of
losing control.
ALWAYS:
Use proper riding techniques to avoid
vehicle overturns on hills and rough
terrain and in turns.
Avoid paved surfaces-pavement may
seriously affect handling and control.
NE JAMAIS opérer:
Sans entraînement ou instruction.
À une trop grande vitesse pour vos habiletés ou
pour les conditions.
Sur les routes publiques, une collision peut
survenir avec un autre véhicule.
Avec un passager, l’équilibre et la direction
seront affectés et augmente les risques de la
perte de contrôle.
TOUJOURS:
Utilisez des techniques de conduits adéquates
pour éviter que le véhicule ne se renverse sur
une colline ou sur un terrain cahoteux ainsi que
dans les virages.
Évitez les surfaces pavées car celles-ci
augmentent les risques de perte de contrôle.
ALWAYS USE AN APPROVED
HELMET AND PROTECTIVE
GEAR

CASQUE QUI CONVIENT
AU CONDUCTEUR ET UNE
VISIÈRE PROTECTRICE.
NEVER USE ON PUBLIC
ROADS

VOIES PUBLIQUES
NEVER CARRY
PASSENGERS

DE PASSAGER
NEVER USE WITH DRUGS
OR ALCOHOL

SOUS L’INFLUENCE DE
MÉDICAMENTS OU
DE L’ALCOOL
2WARNING/AVERTISSEMENT
NEVER ride as a passenger.
Passenger can cause a loss of control,
resulting in SEVERE INJURY or DEATH.
N’utilesez jamais ce véhicule comme
passager.
Le passager peut causer la perte de contrôle
entraînant des BLESSURES GRAVES ou LA
MORT.

11
LOCATION OF LABELS
4WARNING/AVERTISSEMENT
IMPROPER TIRE PRESSURE OR OVERLOADING CAN CAUSE
LOSS OF CONTROL.
LOSS OF CONTROL CAN RESULT IN SEVERE INJURY OR
DEATH.
UNE PRESSION DES PNEUS INADÉQUATE OU TROP DE
PRESSION PEUT ENTRAÎNER UNE PERTE DE CONTRÔLE.
LA PERTE DE CONTRÔLE PEUT ABOUTIR
À DES BLESSURES GRAVES OU LA MORT.
COLD TIRE PRESSURE:
Recommended: Front: 5 psi
Rear: 5 psi
Never set tire pressure below the
recommended level. It could cause the
tire to dislodge from the rim.
LOADING
Maximum vehicle capacity is: 220 lbs.
PRESSION DES PNES FROIDS:
Recommandé: Avant: 5 psi
Arrière: 5 psi

une pression en dessous du niveau
recommandé. Cela pourrait le pneu de
la jante.
CHARGEMENT
Capacité maximale du véhicule est de :
220 lbs/113 kg
5
6
WARNING/ AVERTISSMENT
LOAD LIMIT
POIDS LIMITE
9.1kg (20 lbs) NEVER sit here/ Ne vous asseyez pas ici
WARNING/ AVERTISSMENT
LOAD LIMIT
POIDS LIMITE
4.5kg (10 lbs) NEVER sit here/ Ne vous asseyez pas ici

12
CONTROL FUNCTIONS
SPEEDOMETER AND REARVIEW MIRROR
Speedometer
The speedometer has been pre-set by the factory in km/h and does not
need setting.
After power is turned on, press A to change between time, trip mileage or
cumulative mileage.
Setting the Time
When the time is displayed, press B to adjust the hour, then press A to change
the hour from 0 to 23. After the hour is set, press B once to adjust the minute,
press A to change the minute from 00 to 59, press B once when the correct

Clearing the Trip Mileage
Press A to display the “trip mileage”. Press B once to clear “trip mileage”. The
”accumulative total distance does not change
Rearview Mirror
Adjust the review mirror by grasping the outer edges and turning the mirror
until it is adjusted to the ideal position for the person operating the ATV.
A
B

13
CONTROL FUNCTIONS
RIGHT HANDLEBAR
Throttle Lever
Control the engine and ATV speed with the throttle lever. Operate this lever with
your thumb. Push it forward to increase engine and ATV speed. Release it to
decrease engine and ATV speed.
To set parking brake, squeeze front brake lever
then depress parking brake pin, set the parking
brake lever.
Throttle Adjusting Screw
To limit the throttle, screw in throttle
limiter screw
HANDLEBAR &
SWITCHES
LEFT HANDLEBAR
With the Engine stop switch in the “Stop” position
The engine cannot be started.
With the Engine stop with in the “Run” position
The engine can be started.
Rear brake lever
Apply the rear brake by squeezing the rear brake lever towards the grip.
Parking Brake
To set the parking brake, squeeze the rear brake lever, and depress the parking
brake pin.
Electric starting button
Engine Stop
switch
Electric Start
Button
Rear Brake lever Parking
Brake Pin
Front Brake
lever
Parking
Brake Lever
Throttle
Lever
Throttle
limiter
screw
Lock Nut
Light Switch
Parking
Brake Pin

14
Use the throttle adjusting screw to restrict maximum speed of the ATV. Adjust
this limiter according to the rider’s skill and experience.
Adjusting procedures:
1. Loosen the Lock nut
2. Turn the throttle adjusting screw clockwise to restrict maximum speed of
the ATV.
3. Turn the throttle adjusting screw counterclockwise to increase the
maximum speed of the ATV.
 
FUEL VALVE
There are two positions: “ON” and “OFF”. See the picture below for the
correct operation of these two fuel valves.
FUEL TANK CAP
To open the fuel tank cap, take the end of the vent
tube out from the vehicle body; turn the fuel tank
cap counterclockwise. To close the fuel tank cap,
turn it clockwise and tighten it securely. Be sure
that the vent tube securely connects to the cap
as shown.
Fuel level
Filler neck
“ON” position

the carburetor when the engine is
running
or being started.
“OFF” position

carburetor.
Fuel tank
cap
CONTROL FUNCTIONS

15
SEAT LOCK
To remove the seat, move the seat lock lever
backward. Raise the rear end of the seat and
slide it back.
To lock the seat, slide the seat lever into its

WARNING



WARNING
Improper fueling of the ATV could be hazardous.

let you to breathe toxic fumes.
Refuel in a well ventilated area. Make sure the engine is off and avoid
spilling fuel on a hot engine. Do not smoke, and make sure there are no
 vapors. Keep
children and pets away when you are refueling the ATV.
WARNING
Improperly installing the seat could be hazardous.
Failing to install the seat properly could allow the seat to move and cause
the rider to lose control.
Make sure you are in proper position and the seat is attached securely
when you install it.
CONTROL FUNCTIONS

16
WHAT YOU SHOULD KNOW BEFORE RIDING
Before riding, you should read all the following information carefully. If you are
properly prepared, you will have a more enjoyable ride.

area with enough space to practice the new skills.
Make sure that it is legal to ride in the area you selected. Review the local laws and make
sure you are not trespassing. Call the police if you don’t know where you can ride.
Protect your riding areas. When you are riding, remember to keep the terrain in good
condition. Don’t destroy plants, trees or other vegetation. Don’t litter and don’t bother
wildlife. With your help, your riding area can remain open for use in the future.
After you have found a good place to practice, review the control system on your ATV

not have time to look for them when you are riding.
Canadian residents must obtain, review, and follow all provincial and municipal
government acts and regulations pertaining to owning and operating an off-road vehicle.
WARNING
Operating this ATV without proper instruction could be hazardous.
The risk of riding could increase greatly if you do not know how to operate the ATV
properly under different situations and in different types of terrain.

course. You should regularly practice the skills learned in the course and the
operating techniques described in this user’s manual. For more information about
the training course, visit www.svia.org or call 800-887-2887.
For more information on ATV safety and other provincial and municipal
governmental acts and regulation pertaining to owning and operating an off-road
vehicle visit one of the following web-sites:
www.svia.org
www.cpsc.gov
www.mmic.ca/CATV/
RIDING YOUR ATV

17
INSPECTION BEFORE RIDING
WARNING
Failing to inspect the ATV before operating could be hazardous. Failing to
perform proper maintenance could also be hazardous.
Failing to inspect and maintain your ATV could increase the chances of an
accident or equipment damage
Always inspect your ATV each time before riding, and make sure it is in a safe operating
condition. Refer to the INSPECTION AND MAINTENANCE section in this manual.
ITEM TO CHECK CONTENT
Steering Smoothness; No restriction of movement; No
play or looseness
Brakes Proper brake lever free play; enough brake
force; Parking brake effectiveness
Tires Proper air pressure; Enough tread depth; No
cracks, rips, or other damages
Fuel Enough fuel for the intended trip; Fuel hose
connected securely; No damage to fuel tank or
cap; Fuel tank cap closed securely
Engine stop switch Proper operation
Engine oil Proper level – Check the oil by inspecting the
Engine Oil indicator located at the bottom of
the engine. The engine oil should completely


Throttle Proper free play of throttle lever; Smooth
response; Quick return to idle position
Drive chain Proper tension; adequate lubrication; No excessive
wear or damage
General condition Bolts and nuts are tight; No rattle from any
parts of the engine when running; No visible
evidence of Damage
RIDING YOUR ATV