Baja 49CC DIRT RUNNER Owner's manual

Brand: Baja

Model: 49CC DIRT RUNNER

Type: Owner's manual

49cc Dirt Runner

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!

Do not remove this operator’s manual from this vehicle.

Please obtain, review, and follow provincial / municipal government acts and regulations pertaining to owning and operating an off-road vehicle.

OWNER’S MANUAL

Minimum Recommended

Age Requirement

49cc Model: 16

In the Province of Quebec Canada the

minimum operator age shall be 14+ as

specied by the Quebec Off-Highway

Vehicles Act.

Congratulations on your purchase of the Baja

Motorsports DR50 Dirt Bike.

Your bike is warranted to be free of manufacturing defects in the material of

workmanship for a period of 90 days form the date of purchase. During the warranty

period BAJA MOTORSPORTS, LLC will at its option, repair, provide replacement parts

or replace your Baja Motorsports 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

If wheels are bent or broken

Fender bent or broken due to abuse

Any sign of impact, accident, jumping, spin-outs or roll over.

BAJA MOTORSPORTS, LLC 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 Baja Motorsports DR 50 for

repair, please call the BAJA MOTORSPORTS customer service department TOLL FREE

at 1-888-863-BAJA (2252) between the house 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 as 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. All operators

should obtain, review, and follow provincial and

municipal government acts and regulations pertaining

to owning and operating an off-road vehicle. Children

under the age of 16 should be supervised by a

responsible adult.

WARNING

SAFE OPERATION......................................................................... 3

SAFETY GEAR .............................................................................. 4

MODIFICATION OF VEHICLE........................................................ 4

MAIN DATA.................................................................................... 5

PARTS & SUBASSEMBLIES ......................................................... 6

OPERATION .................................................................................. 8

FUEL COCK............................................................................ 8

ENGINE STARTING................................................................. 9

BREAKING IN THE ENGINE ................................................... 10

SWITCHES ON THE RIGHT HANDLEBAR ............................. 11

GEAR SHIFTING ..................................................................... 12

CHECK-UPS, ADJUSTMENT AND MAINTENANCE..................... 13

CHANGING THE OIL .............................................................. 14

CHECK-UP OF SPARK PLUG ................................................ 14

CHECKING & CLEANING THE AIR FILTER ............................ 15

ADJUSTING THE THROTTLE CABLE .................................... 16

ADJUSTING THE CARBURETOR........................................... 16

ADJUSTING THE AIR VALVE GAP.......................................... 17

BRAKE CHECKING................................................................. 17

ADJUSTMENT OF FRONT BRAKE......................................... 18

ADJUSTMENT OF REAR BRAKE ........................................... 19

ADJUSTMENT OF CHAIN ...................................................... 19

GREASING PROCEDURES TO THE DRIVING CHAIN ........... 20

VEHICLE WASHING................................................................ 21

INSTRUCTIONS FOR STORAGE............................................ 22

RESUMPTION OF SERVICE AFTER STORAGE ..................... 23

TABLE AND TORQUE OF FASTNERS .................................... 23

RESUMPTION OF SERVICE ................................................... 24

MAINTENANCE REOUTINE DIAGRAM .................................. 24

ELECTRICAL PRINCIPLE DIAGRAM...................................... 26

Table of Contents

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.

All information, illustrations, photographs and specications contained in 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 rst part will identify a POTENTIAL HAZARD.

The second part will describe WHAT COULD

HAPPEN if you ignore the WARNING or

CAUTION.

The third part will describe HOW TO AVOID THE

HAZARD.

SAFE OPERATION

Rules for Safe Operation

· A pre-operation check must be conducted, before starting the engine, insure safety,

prevent mishaps, and damage to components.

· It is strongly suggested that all operators take a certied motorcycle rider’s course

prior to operating the vehicle.

· Full attention is required during driving; paying close attention to the following

points to avoid any injury to you by other motorized vehicles:

· Do not drive too close to other vehicles.

· Never carry a passenger. This dirt bike is for one operator only

· Never operate this dirt bike at night. Night is dened as the period of time 30

minutes before sunset to 30 minutes after sunrise.

· Driving at high speeds is the cause of many accidents; do not drive at a speed that

the actual situation does not permit.

· 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.

· All information, illustrations, photographs and specications contained in

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

· Always avoid operating an this dirt bike on paved surfaces, including; sidewalks,

paths, parking lots, driveways, streets, roads, and highways. Never operated this or

any Off-Road Vehicle on a public street, road or highway where motor vehicles are

in operation.

SAFETY GEAR

1. Never operate this dirt bike without wearing a DOT approved motorcycle helmet

which ts properly. Operators should also wear eye protection (goggles or face

shield), gloves, boots, long-sleeved shirt or jacket, and long pants.

2. Loose clothes are not suitable for motorcycle driving or riding as they may get

caught on the operating lever, kick lever, footrest or wheel, resulting in danger.

MODIFICATION OF THE VEHICLE

CAUTION

Never perform any unauthorized modications to this vehicle. Only use original

replacement part which can be obtained through Baja Motorsports 888-863-2252.

MAIN DATA

Description Data Description Data

Overall length 1625mm Cylinder bore x

stroke

39mm X 41.4mm

Overall width 690mm Compression ratio 8.8 : 1

Overall height 1085mm Output, max 2.0KW/7500rpm

Wheelbase 1055mm Torque, max 2.5N.m/6000r/min

Dead weight 65kg Idling speed 1500r/min ± 150r/min

Payload 60kg Displacement of

cylinder

49mL

Front wheel 2.50-14-4PR Spark plug NHSP LD A7RTC

Rear wheel 3.00-12-4PR Spark plug gap 0.6 ~ 0.7mm

Speed, max ≥ 70km/h Gap of air valve Intake valve: 0.05mm

Braking distance ≤ 7m(30km/h) Gap of air valve Exhaust valve:

0.05mm

Climb ability ≥ 18° Ground clearance 140mm

Capacity of

gasoline tank

4.9L Ignition means CDI

Transmission Ratio

gear 3.272 2

gear 1.937

gear 1.350 4

gear 1.043

Transmission ratio of

sprocket

2.929

Primary transmission

ratio

3.722

PARTS & SUBASSEMBLIES

Front brake lever

Throttle twist grip

Fuel tank cover

Front Wheel

Front Shock Absorber

Fuel Cock

Gear Shifting

Pedal

Engine Number

Side Stand

Rear Fork

Rear Wheel

Seat Cushion

Exhaust Silencer

Kick Lever Rear Braking Pedal

OPERATION

FUEL COCK



Fuel lling

The capacity of the fuel tank is 5.9L in total including 1.0L of reserve. Unscrew the gas

cap by turning it counter clockwise and carefully ll the tank with unleaded gasoline

through the opening. DO NOT MIX GAS AND OIL TOGETHER, THIS IS A 4-STROKE

ENGINE. Replace the gas cap by carefully aligning the threads on the cap and the tank

and turning the cap clock wise. Wipe any spilled fuel from the dirt bike using a cloth

and dispose of the cloth properly. DO NOT SMOKE OR REFUEL THE VEHICLE NEAR

OPEN FLAMES OR NEAR HEATING UNITS. ONLY REFUEL THE VEHICLE IN OPEN

AREAS TO REDUCE THE LIKELIHOOD OF THE BUILD UP OF GASOLINE FUMES.



Operation of the fuel cock (the valve under the fuel tank)

ON: With the handle of the fuel cock to “ON” position, the fuel supply will ow to the

carburetor.

OFF: With the handle of the fuel cock to “OFF” position, the fuel supply is cut off to

the caburetor.

RES: With the handle of the fuel cock to “RES” position about half of the fuel will be

used in the tank leaving about 1.0 L of fuel in the tank. When the engine runs out of

gas with the fuel cock in the “RES” position, move the fuel cock to the “ON” position to

use the remaining 1.0 L of fuel. Refueling should be carried out as soon as possible.

OFF

RES

Fuel Cock Handle

ENGINE STARTING



Set the key of the ignition switch to “

” position.



Put the dirt bike in the neutral gear.



Ensure that there is fuel in the tank.



Set the fuel cock handle to “ON” or “RES” position.

To start a cold engine:



Pull up the choke bar of the carburetor

(to close the choke).



Rotate the throttle twist grip by 1/8 to 1/4 turn.



Start the engine with the kick starting system.



Slightly turn the throttle twist grip to increase the speed of the engine so as to warm

up the engine.



Turn the carburetor choke bar downward to fully open the choke when the engine is

sufciently warmed up.

Procedures for stopping the engine:



Release the throttle twist grip to slow down the engine.



Shift to the neutral position.



Set the ignition switch key to “

” position.



Set the fuel cock (the fuel tank valve) handle to “OFF” position.

CAUTION

The engine can only be started in the neutral gear.

Unnecessarily increasing RPM’s to a high level while the dirt bike is in neutral is

harmful to the engine.

WARNING

Never start the engine in a closed place as the exhausted gas from the vehicle

contains toxic carbon monoxide.

choke bar

BREAKING IN THE ENGINE

The rst 600 Miles of operation should be considered the “Break-in” period and special

attention shall be paid to the following points:

1. Take special care not to increase the RPM’s of the engine while climbing steep

slopes. Never drive your dirt bike continuously for more than 30 miles without

increasing and decreasing the throttle.

2. The engine shall be warmed up for 3-5 minutes prior to operation so all components

are lubricated sufciently.

3. The driving speed shall not be over 25 MPH maximum during the rst 300 miles of

operation and not over 35 MPH maximum during the remaining 300 miles of the

“Break-In” period.

SWITCHES ON RIGHT HANDLEBAR

Ignition switch

The ignition switch is provided on the right handlebar.

When the switch is turned to “

” (off) position, the engine will not start or stops the

engine.

When the switch is turned to “

” (on) position, the engine can start and the vehicle

can be driven.

This is the speed control nut and bolt. It controls the top speed of the dirt bike. To

lower the maximum speed of the dirt bike, adjust the bolt in. This feature is to help

younger riders adjust learn a lower speeds while providing the adult supervisor the

ability to increase the speed as the younger rider progresses.

Speed control bolt

Start button

GEAR SHIFTING

A non-cycling mode of gear shifting is employed for this motorcycle.

Reduce the throttle before shifting. Never increase the throttle while shifting gears.

Do not place your foot on the gear-shifting pedal while operating the dirt bike to avoid

damaging the clutch caused by sudden gear shifting accidentally.

Legend for the right gure:

(N) Neutral gear

(1) 1st gear

(2) 2nd gear

(3) 3rd gear

(4) 4th gear

Points for Attention during Drive

1. Avoid unnecessary idling of the engine at a high speeds. Doing so will damage the

engine components seriously.

2. The clutch will wear out quickly if the dirt bike is operated with the clutch in a semi-

engaged position.

3. Only shift to the low speed gears when you feel that there is insufcient power to

climb hills or continue forward.

4. Do not use the front brake only or coast using the neutral gear especially when

descending or driving at a high speed.

5. Decrease the throttle when braking.

Shifting forward

Shifting backward

N 1

N 1 2 3 4

CHECK-UPS, ADJUSTMENT AND MAINTENANCE

Checking the Oil

Check the engine oil each time prior to operating the dirt bike.

The oil level should be between the upper and lower lines of the oil gauge tted in a

screw plug, which is on the right cover of the crankcase.

1. Set the motorcycle on level ground, screw off the oil gage plug, wipe the oil gage

rod clean and then insert the gage plug into the crankcase again to check the oil

level. There is no need to screw the oil gage plug into its hole in the crankcase.

2. Add lubricating oil up to the upper line when needed, but do not overll.

3. Finally screw on the oil gage plug tightly.

Lubricating Oil Recommended

The lubricating oil is an important factor affecting the performance and service life of

the engine. Please refer to the chart for the correct grade of engine oil based on the

environmental conditions in your area. Do not use any other type of oil other than

what is recommended in the chart. DO NOT MIX OIL WITH THE GASOLINE.

Lubricating oils of different

viscosity shall be employed

in different regions and at

different temperatures.

MACHINE

OIL

TEMP.

°C

°F

-30

-22

104

-20

-4

-10

20W-50

5W-40 15W-50

10W-40 10W-50

10W-30

CAUTION

Never start the engine when there is

insufcient lubricating oil. Otherwise, it

will cause harm to the engine.

Machine oil gauge

CHANGING THE OIL



Remove the “Screw Plug” located at the bottom of the engine and let the oil drain

into an approved collection container. DO NOT PERFORM THIS PROCEDURE

WHILE THE ENGINE IS HOT. SERIOUS BURNS COULD RESULT FROM CONTACT

WITH HOT OIL.



Dispose of the used oil properly. For proper disposal procedures, contact your

local oil recycling center.



Clean and replace the “Screw Plug” tighly.



Rell the engine with the proper amount of oil and recheck the amount of oil in the

engine by using the oil gauge plug.

* This job should not be done by untrained persons but should be done at an

authorized service center.

Screw plug for oil draining

CHECK-UP OF SPARK PLUG



Remove the cap of spark plug and screw off the

spark plug using the plug wrench.



Clean the spark plug all around or replace it if it is

corroded or there is too much deposit on it.



Regulate the gap of the spark plug to 0.6-0.7mm.



The spark plug of the designated type should be

used. The applicable type of spark plug: NHSP LD

A7RTC made in China or Equivalent US Brand.

0.6~0.7mm

CHECKING & CLEANING THE AIR FILTER

Take the air lter out and check if it is dirty or torn.

Dismounting:

Wash the lter in clean water and wipe it dry with a clean cloth.

Soak the lter element in clean machine oil. Squeeze it with a dry cloth to remove

excess oil.

Recommended oil: 15W/40QE

CAUTION

The air lter element must be intact or the engine will suck in dust and dirt,

resulting in a shorter service life of the engine.

Water should be prevented from entering into the lter when washing the vehicle.

The lter element shall be cleaned gently without twisting to prevent it from

cracking. Never wash it with gasoline or any acid, alkaline or organic volatile oil

to avoid its aging, which will result in reducing the effect of the air lter oil to catch

particles before they enter the engine. Replace the lter element with a new one if

it is broken or cracked.

ADJUSTING THE THROTTLE CABLE

Make sure that the adjusting and lock nuts of the throttle cable work normally.

Check if the throttle twist grip has the required free operating movement.

The required free operating movement: 2-6mm. If the grip cannot be moved freely,

turn the adjusting nut to ensure proper operating movement.

*After adjustment, start the engine and check for the operating movement again.

Repeat the adjustment if necessary until the desired operating movement is obtained.

ADJUSTING THE CARBURETOR

Adjusting procedures of idling speed:

1. Support the vehicle by a stand.

2. Adjust the idling speed by the throttle stop screw



to 1500 ± 150rpm.

CAUTION

Do not try to correct a malfunctioning carburetor by adjusting the idling speed. If

the carburetor is not functioning properly, it should be repaired by a service center.

Adjust idling speed only when the engine is warmed up or 10 minutes after operation.



Idling speed adjusting screw

ADJUSTING THE AIR VALVE GAP

The engine will make excess noise if the gap is too large in the air valve. If the gap is

too small valve operation will be hindered which could result in valve malfunction and

failure. Therefore, the air valve gap must be checked periodically.

The gap of the air valve should be inspected and adjusted when the engine is cold by

using the following procedures. This procedure should only be performed by a qualied

motorcycle technician at a service center:



Remove the caps of the central hole and the top hole (the ignition timing

observation hole) in the left crankcase cover.



Remove the caps of the two air valves on the cylinder head.



Insert the “T” key into the central hole of the crankcase cover, jam it against the nut

of the ying wheel and then turn the ying wheel clockwise until the engraved “T”

mark on the ying wheel aligns with the engraved line on the top of the crankcase

cover. Swing the rocking arm slightly. A loose rocking arm (which indicates the

existence of clearance) shows that the piston is in the upper stop position of the

compressing stroke, where the valve can be adjusted. A tight rocking arm means

that the piston is in the lower stop position of the compressing stroke. In this case,

continuously turn the “T” key clockwise for 360 degrees until the alignment of those

engraved marks, where the valve can be adjusted. Afterwards, check the valve gap

by inserting a feeler in between the valve adjusting screw and the end of the valve.

The specied air valve gap: 0.05mm for the intake and exhaust valves respectively.

BRAKE CHECKING



Remove the front and rear brakes respectively and check for wear of the brake

shoes. If the mark “∆” on the brake drum cover aligns with that “∆” on the brake

cam, it means that the brake shoes are already worn to the limit and have to be

replaced.



Replacement should be carried out at a designated service center and it is

recommended that only original replacement parts are used.

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Baja 49CC DIRT RUNNER Owner's manual

Baja 49CC DIRT RUNNER Owner's manual

Baja 49CC DIRT RUNNER Owner's manual

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