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Cobra DG450, Owner'S Manual, Page: 3 / 15

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Cobra DG450 Owner'S Manual Download Page 3

 

 

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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.

 

Summary of Contents for DG450

Page 1: ...ENGINES OWNER S MANUAL Model DG450 ...

Page 2: ...f 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 ...

Page 3: ...ncy 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 operat...

Page 4: ...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 O...

Page 5: ...tive 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 rapidly to overcome compression prevent kickback 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 ...

Page 6: ... trouble free there is a maintenance schedule included in these instructions Routine and simple maintenance procedures can be carried out with simple hand tools by you the user if you feel confident to do so There are other service tasks that require specialist tools and are more difficult to carry out These are best handled by a professional and we would recommend that they are performed by a qua...

Page 7: ... to do so MAINTENANCE SHCEDULE 1 Service more frequently when used in dusty environments 2 Change the engine oil every 25 hours when used under heavy load or in high ambient temperatures 3 These items should be serviced by a Cobra authorized servicing dealer unless you have the proper tools and are mechanically proficient If you fail to carry out the above maintenance schedule it could result in n...

Page 8: ...anty Always use the specified fuel Never use stale or contaminated petrol or oil mixture Avoid getting dirt or water in the fuel tank Adding Fuel 1 Carefully remove the fuel tank cap 2 Fill the tank to the bottom of the fuel level limit in the neck of the fuel tank Wipe up spilled fuel before starting the engine Never overfill Fuel tank capacity DG450 0 32gal U S 1 2L DG550 0 53gal U S 2 0L Adding...

Page 9: ...high quality oil SAE30 and API SG SH OR SJ classification Drain the engine oil when the engine is warm warm oil drainsquickly and completely 7 Oil filler cap dipstick A Sealing washer B Drain bolt 1 Turn the fuel valve to the OFF position to reduce the possibility offuel leakage 2 Place a suitable container next to the engine to catch the used oil 3 Remove the drain boltand drain the oil into the ...

Page 10: ...e the air cleaner from the air filter base 3 Inspect the air filter elements Replace any damaged elements Clean or replace dirty elements Cleaning 1 Remove the air filter cover and foam element as described in the INSPECTION procedure 2 Remove the foam element from the air cleaner base 3 Tap the element several times on a hard surface to remove excess dirt Never try to brush off dirt brushing will...

Page 11: ...he spark plug by hand to avoid cross threading 6 Ensure the correct size wrench is used when tightening the washer 7 When installing a new spark plug tighten 1 2 turn after the spark plug seats to compress the washer 8 When reinstalling the original spark plug tighten 1 8 1 4 turn after the spark plug seats to compress the washer FLYWHEEL BRAKE INSPECTION 1 Check to see if the inspection screw is ...

Page 12: ...e you may need to have the carburetor and other fuel system components serviced or replaced The air in a partially filled fuel tank promotes fuel deterioration Very warm storage temperatures accelerate fuel deterioration Fuel problems may occur within a few months or even less if the petrol was not fresh when you filled the fuel tank Fuel system damage or engine performance problems resulting from...

Page 13: ...r ignition Only store your machine in a well ventilated indoor area Store away from appliances that could cause a spark such as electric motors or where power tools are operated Do not locate your machine close to an open flame such as a heater boiler Always store your machine with the fuel valve in an off position Do not store your machine with high humidity as this can cause rust and corrosion K...

Page 14: ...rol 2 Remove and inspect Spark plug Spark plug faulty fouled or Improperly gapped Spark plug wet with fuel flooded engine Replace the spark plug Dry and reinstall spark plug 3 Check choke Choke is opened Shut off choke well 4 Take engine to an authorized our Servicing dealer or refer to shop manual Fuel filter clogged carburetor malfunction ignition malfunction valves stuck etc Replace or repair f...

Page 15: ...r servicing dealer or referto shop manual Fuelfilter clogged carburetor malfunction ignition malfunction valves stuck etc Replace or repair faulty Components as necessary TECHNICAL CONSUMER INFORMATION TECHNICAL INFORMATION Serial Number Location A Serial number location Record the engine serial number in the space below You will need this information when ordering parts and when making technical ...

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