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Summary of Contents for Cobra DG450
- Page 1 ENGINES OWNER’S MANUAL Model: DG450...
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Page 2: Table Of Contents
CONTENTS INTRODUCTION................ SAFETY MESSAGES..............Safety Information..............PARTS DESCRIPTION……………………......... 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.............. -
Page 3: Introduction
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. -
Page 4: Operation
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. ... -
Page 5: Stopping The Engine
Warning Each successive electronic ignition time can not exceed 10 seconds; this will affect the service life of the battery. Manual pull start operation engage the “Brake control handle”, then grasp the starter grip handle, 2) Move the throttle to the choke position, pull slowly until resistance is felt then pull cord rapidly to overcome compression prevent kickback and start engine. -
Page 6: Specifications
It is always recommended that more difficult maintenance and service to your engine is undertaken by a qualified technician preferably a Cobra service agent. Only you can decide if you can perform a given task. Service agents can be found at: www.cobragarden.co.uk Failure to properly follow maintenance instructions and precautions can result in injury or even death. -
Page 7: Safety Precautions
(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. -
Page 8: Engine Oil
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) 0.53gal (U.S) (2.0L) DG550:... -
Page 9: Engine Oil
Oil Level Check 1. Check the oil with the engine stopped and level. 7. Oil filler cap/dipstick Max: upper limit Min: lower limit Remove the oil filler cap/dipstick and wipe it clean with a clean rag to prevent dirt deposits contaminating fuel. 3. -
Page 10: Air Filter
AIR FILTER It is essential that the air filter is clean and free from dirt and dust. If dirt is allowed to build up it will restrict air flow to the carburetor and cause poor engine performance and use up more fuel. Inspect the air filter before you operate the machine. -
Page 11: Flywheel Brake Inspection
FLYWHEEL BRAKE INSPECTION 1. Check to see if the inspection screw is contacting the brake bracket. 2. If the inspection screw is contacting the brake bracket, take the engine to a Cobra authorized engine servicing dealer for flywheel brake pad inspection. -
Page 12: Engine Adjustments
ENGINE ADJUSTMENTS Do not change in any way the rated speed of the engine (carburetor side or regulator side). Your engine was adjusted in the factory and the non-respect of the homologation speed engine could be dangerous for your safety and others safety. If the rated speed is changed in any way, the factory warranty will be cancelled. Helpful tips and suggestions when storing your engine Storage Preparation Proper storage preparation is essential for keeping your engine trouble free and looking good. - Page 13 4. Carburetor A: Drain bolt B: Washer Engine Oil 1. Change the engine oil. 2. Remove the spark plug. 3. Pour a tablespoon (5 - 10 cc ) of clean engine oil into the cylinder. 4. Pull the recoil starter several times to distribute the oil. 5.
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Page 14: Transporting
TRANSPORTING Always keep the machine level when transporting and make sure the fuel valve is in an “off” position. TAKING CARE OF UNEXPECTED PROBLEMS ENGINE WILL NOT Possible Cause Correction START Out of fuel. Refuel Bad fuel; engine stored 1. Check fuel. Drain the fuel tank and without eating or draining Carburetor. -
Page 15: Technical& Consumer Information Technical Information
Correction Possible Cause ENGINE LACKS POWER Air cleaner elements Clean or replace air 1. Check air cleaner clogged. Cleaner elements(p. 12) without treating or draining carburetor (p. 9). Refuel 2. Check fuel. gasoline, of refueled with with fresh gasoline. bad gasoline. Replace or repair 3.
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Do you have a question about the DG450 and is the answer not in the manual?
Questions and answers
Why can I pull on the starter rope and it does not turn over the engine
The Cobra DG450 engine may not turn over when pulling the starter rope due to several possible reasons:
1. Brake Control Handle Not Engaged – The brake control handle must be engaged to release the flywheel brake. If it is not engaged, the engine will not start.
2. Choke Position – If the engine is warm and the choke is used, it may prevent starting. Ensure the throttle is slightly past the choke position for a warm engine restart.
3. Fuel Issues – Old or stale petrol can cause engine starting problems. Always use fresh fuel.
4. Starter Rope Handling – The rope must be pulled rapidly after feeling resistance to overcome compression. A slow or weak pull may not start the engine.
5. Obstructions or Damage – If the starter grip or cord is damaged or obstructed, the engine may not turn over.
Checking these factors should help resolve the issue.
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Is it easy to replace the recoil mechanism
Yes, replacing the recoil mechanism on a Cobra DG450 appears to be easy. Users mention that the Cobra recoil starter unit fits well, is easy to install, and works immediately.
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