Cobra DG450 Owner's Manual

ENGINES

OWNER’S MANUAL

Model: DG450

- 1 -

1

CONTENTS

INTRODUCTION........................................................................ 2

SAFETY MESSAGES................................................................ 2

Safety Information...................................................................... 2

PARTS DESCRIPTION……………………................................. 2

BEFORE OPERATION CHECKS............................................... 2/3

OPERATION............................................................................... 3

Safe Operating Precautions........................................................ 3

Starting the Engine..................................................................... 3/4

Stopping the Engine.................................................................... 4

Specifications.............................................................................. 5

SERVICING YOUR ENGINE...................................................... 5

The Importance of Maintenance................................................. 5

Maintenance Safety.................................................................... 5

Safety Precautions...................................................................... 6

Maintenance Schedule................................................................ 6

Refueling .................................................................................... 6

Fuel Recommendations ............................................................. 6

Engine Oil................................................................................... 7/8

Air Filter ................................................................................. 9

Spark Plug ................................................................................. 9/10

Fly Wheel Brake Inspection………............................................. 10

Engine Adjustments………………………………………………… 11

Adding a Fuel Stabiliser to Extend Fuel Storage Life................. 11

Draining the Fuel Tank and Carburetor....................................... 11/12

Transporting................................................................................ 13

TAKING CARE OF UNEXPECTED PROBLEMS....................... 13/14

TECHNICAL& CONSUMER INFORMATION

TECHNICAL INFORMATION...................................................... 14

Serial Number Location............................................................... 14

Warranty……………………………………………………………… 14

- 2 -

INTRODUCTION

Thank you for purchasing the Cobra DG450 engine. In order to get the best results and fully understand how to
operate it safely, please read these instructions carefully before attempting to use this engine.
Please keep the manual safe should you require it for future instruction.
Should you resell the lawnmower please do not forget to include this manual with the machine.

Please pay attention to the instruction manual provided with the equipment powered by this engine. Pay particular
attention to safe engine start up/engine shut down, safe operation, adjustments and maintenance.

SAFETY MESSAGES

Please pay particular attention to this symbol , or It is a warning sign, and features throughout
this instruction manual. Faliure to follow these warnings exactly can result in personal injury and even death to

yourself or others. And injury to property.

SAFETY INFORMATION

Fully understand how to operate all of the controls and learn how to stop the engine quickly and safely, in

the case of an emergency. Before attempting to operate this equipment, make sure the user receives
adequate instruction and training.

This engine produces poisonous carbon monoxide from the exhaust. Never run the engine indoors and

always ensure there is adequate ventilation.

The engine and exhaust become very hot during operation. Keep the engine at least 3 feet (1 meter) away

from buildings and other equipment during operation. Keep flammable materials away, and do not place
anything on the engine while it is running

Parts Description

1. Starter grip

2. Fuel cap

3. Air filter

4. Carburetor

5. Spark plug

6. Muffler

7. Starter motor

8. Oil filter cap/dipstick

9. Fuel tank

BEFORE OPERATION CHECKS

BEFORE OPERATION CHECKS

For your safety, and to maximize the service life of your equipment, it is very important to take a few moments to check
the engine condition before operating. If a problem is detected do not run the engine before the required repair is carried
out.

WARNING

Please ensure that proper maintenance is carried out on the engine. Failure to do so can result in a serious
malfunction which can result in injury or even death. Always perform a pre-operation inspection before each use
and carry out the necessary repair/maintenance.

- 3 -

Please check the following each time you use this machine.

Always check the following items before you start the engine:

 Fuel level
 Oil level

 Air cleaner

 General inspection: Check for fluid leaks and loose or damaged parts.
 Check the equipment powered by this engine.

OPERATION
SAFE OPERATING PRECAUTIONS

Before operating the engine for the first time, please review the SAFETY INFORMATION section and the BEFORE OPERATION
CHECKS above.

WARNING

Carbon monoxide gas is toxic. Breathing it can cause you to become unconscious and even kill you.
Avoid any areas or actions that expose you to carbon monoxide

Never start this machinery indoors or where there isn’t enough ventilation including your shed and garage. Carbon Monoxide can build
up quickly and cause unconsciousness and death.
Pay attention to the instructions provided with the equipment powered by this engine for any safety precautions that should be
observed with engine startup, shutdown, or operation.

STARTING THE ENGINE

Turn the fuel valve switch to the ON position

A1. FOR STARTING A COLD ENGINE:

Move

the

throttle control

to the

choke

position.

Close the

safety brake control

handle

(on the

equipment), you can

choose one of the following two methods to start the engine.

A. Control lever

Electronic ignition operation

1)

Move the throttle to the choke position,

engage the “Brake control handle”, Insert the key into the switch lock;

turn the key clockwise for the engine to start.

- 4 -

Warning

Each successive electronic ignition time can not exceed 10 seconds; this will affect the service life of the battery.

Manual pull start operation

2) Move the throttle to the choke position,

engage the “Brake control handle”, then grasp the starter grip handle, pull

slowly

until

resistance

is felt then pull

cord ra pidly

to

overcome compression

prevent kickback

and

start engine.

A. Cable hole

A2. FOR RESTARTING A WARM ENGINE:

Do not use the choke when the engine is warm. Move the throttle control slightly past the choke position

you can
choose one of
The following two methods can start the engine.

1) Engage the brake control handle, insert the key switch lock, then the positive clockwise for electronic ignition

operation.

2) Engage the brake control handle, grasp the starter grip

handle

and

pull

slowly

until

resistance

is felt then pull

cord ra pidly

to

overcome compre ssion

prevent kickba ck

and

start engine.

B1. FLYWHEEL BRAKE MODELS:

Move the throttle to the choke position engage the starter control handle (located on the equipment) to release the

flywheel brake.

The engine will stop if you release the brake control handle.

Do not allow the starter grip to snap back against the

engine.

Return it gently to prevent damage to the

starter.

B2. FLYWHEEL BRAKE MODELS:

Continue to hold the brake control handle (located on the equipment). The engine will stop if you release the
starter control handle.

STOPPING THE ENGINE

1. Turn the fuel valve to the OFF position

2. Flywheel brake models

:

Release the brake control handle (located on equipment) to stop the engine.