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How To Change Generator Spark Plug?

Replacing your spark plugs will improve your engine’s efficiency and extend its life. This article will show you how to replace a worn spark plug step by step.

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Is this the time of year when bad spark must be replaced as part of generator tuning? I have some great news to share with you! Our team at BISON generator company has helped many people find solutions for generator repairs and parts replacement. We will definitely help you too.

Despite the appearance, the actual replacement process is very simple. It would be a smart choice for the professional handyman. Thanks to our instructions and user manual, amateurs will have no problems.

In fact, our first piece of advice is to read the guide before starting the update process, as it often contains information on the correct spark plug type.

The Significance of Replacing Generator Spark Plugs

Maintaining the efficiency and durability of your generator is highly dependent on replacing generator spark plugs. Inefficient fuel usage, diminished power production, and potential engine harm can result from a worn or damaged spark plug. Consistently examining and changing your generator’s spark plugs guarantees peak performance and extends the lifespan of your generator.


How to change generator spark plug step by step?

  1. Discover The Spark Plug: The first (and frequently most difficult, especially if this is your first time) step is to find the spark plug. It is frequently buried beneath a detachable case and covered by a spark plug boot.
  2. Disconnect The Plug Wire: Once you’ve discovered the location of your old plug, you must unplug the wire that is connected to it. You must have access to the boot of a spark plug wire to do so safely. Twist the boot in either way and pull off at the same time once you have a firm grip on it.
  3. Clean The Area Completely: Check that the old plug and everything surrounding it is clean when you disconnect the wire. Take your time with this because missing the cleaning process might do significant damage to your generator.remove generator carburetor 2
  4. Remove The Old Plug: Remove the old plug if everything is clean and you are confident that nothing will fall into your engine. A ratchet and a spark plug socket are required.
  5. Watch Out For The New Spark Plug: Before installing your new spark plug into your generator, make sure you have the correct model, size, and gap.
  6. Installation Of A New Plug: Once you’ve determined that your plug has the proper gap, you can install it. Simply take the empty spark plug socket, insert the new plug, and replace it in the engine’s empty socket.
  7. Replace The Plug Wire: After you’ve safely installed your new spark plug, reconnect the wire. Again, take the spark plug wire boot and slip it over the head of the plug. Then, press it until it is completely inserted.

Signs that the spark plugs need replacing

Recognizing the indications that your generator spark plug requires replacement is crucial. Here are some typical signs:

  1. Challenges when starting the generator

  2. Decreased power output

  3. Higher fuel consumption

  4. Engine misfires or stalls

  5. Observable damage or wear on the spark plug

If any of these indications are present, it’s time to change your generator’s spark plug.

show spark plug in hand

How to change generator spark plug of a portable generator?

Replacing your spark plugs will improve your engine’s efficiency and extend its life. Replace worn spark plugs with new ones. Follow the instructions to replace the spark plugs on your portable generator.

Step 1: Make sure the power is turned off and all cords are unplugged.

Step 2: Start by removing the plug shoe and then the spark plug using a socket wrench.

Step 3: Insert the replacement spark plug by hand into the spark plug housing and tighten it with the socket wrench, taking care not to over-tighten.

Step 4: In step four, replace the spark plug boot.

BISON Safety Tip: Before maintaining or repairing any power equipment, disconnect the spark plug and battery wires. Wear proper safety eyeglasses and gloves to protect you from hazardous materials and debris.

Items you will need to change the generator spark plug

  1. Spark plug with the proper spacing
  2. The brush and towel must be clean.
  3. 3/8″ and 5/8″ spark plug socket
  4. Gloves for protection
  5. Phillips and flathead screwdrivers
  6. Set for gapping spark plugs
  7. Ratchet


Changing your generator’s spark plug is a simple yet crucial maintenance task that ensures the optimal performance and longevity of your generator. By following the step-by-step guide provided in this article and paying attention to the additional information on the importance, signs, replacement frequency, and proper gapping of spark plugs, you can effectively maintain your generator and keep it running efficiently for years to come.

Change The Spark Plug FAQ

Spark plugs should be replaced every 100 hours of use. The spark plugs should be checked during generator service to ensure they are not worn or broken.

To replace your alternator’s spark plugs, all you need are a few tools. The most important tools are a socket wrench with an extension and a spark plug socket.

Tighten the spark plug finger-tight until the gasket touches the cylinder head, then use a spark plug wrench to tighten another ½ – ⅔ turns.

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