A Guide To Honda GX340 Spark Plug Gap, Number & Socket Size

Navigating the labyrinth of engine maintenance can feel like deciphering an alien language. But you’re not alone; we’re here to unravel the mystery.

In your hands-on journey with your Honda GX340, knowing about the spark plug gap, number, and socket size is essential. These seemingly small details play a big role in keeping your engine running smoothly and efficiently.

Spark plugs are vital for ignition – they produce the spark that ignites the air-fuel mixture inside the engine’s cylinders, setting off a chain reaction that powers your machine. The correct gap ensures optimal performance while preventing damage from misfires or incomplete combustion.

Whether you’re an experienced mechanic or just getting started on your DIY journey, this comprehensive guide will walk you through everything you need to know about Honda GX340 spark plug specifications.

So buckle up, and let’s dive into this integral part of automotive knowledge together!

A Guide To Honda GX340 Spark Plug Gap, Number & Socket Size

Key Takeaways

  • The spark plug for Honda GX340 is BPR6ES-11 (NGK) 98079-56145 / W20EPR-U11 (DENSO) 98079-56155 or equivalent.
  • The spark plug gap should be measured with precision tools and should be between 0.039’– 0.043′.
  • The socket size required for installation or removal of the spark plug is 13/16′ (21mm).
  • NGK and DENSO offer high-quality spark plugs suitable for Honda GX340.
  • Owner´s manual – https://cdn.powerequipment.honda.com

Honda GX340 Spark Plug Gap & Number

For your Honda GX340, you’ll need a spark plug with the number BPR6ES-11 (NGK) 98079-56145 / W20EPR-U11 (DENSO) 98079-56155 or an equivalent, and it should have a gap size of just between 0.039’– 0.043′.

This small but crucial space is where the spark ignites, initiating the combustion that drives your engine.

The accurate setting of this gap is critical to engine performance. Too large a gap may cause misfires during operation; too small can affect ignition timing. Therefore, ensure you use precision tools for precise measurement, adhering strictly to specifications laid out in the owner’s manual.

Finding an exact match for your spark plugs might seem daunting at first glance due to the numerous brands available out there. However, worry less, as NGK and DENSO offer high-quality options that are perfect fits for your engine model.

When replacing these vital components, remember also to check if you have the right socket size – 13/16′ (21mm). It’s essential because using an inappropriate socket could lead to damage during installation or removal.


You’ll find it interesting that the socket size needed for your Honda GX340 engine’s spark plug is 13/16′ (or 21mm), a common size making maintenance tasks easier.

It’s an essential detail when you’re gearing up to replace or clean your spark plugs, ensuring that you have the correct tools on hand. This socket dimension fits snugly around the hexagonal end of the spark plug, facilitating its removal and installation without causing damage.

Having a 13/16′ (21mm) socket in your toolbox allows for efficient and effective tune-ups of your engine. This size is quite standard, meaning you won’t have to hunt around for a specialized tool. Instead, you can focus on providing optimal care for your Honda GX340 engine.

Understanding these nuances about your engine enhances its performance and gives you a sense of belonging within the community of informed motor enthusiasts who take pride in their knowledge and skills.

Knowing the specificities like BPR6ES-11 type spark plug or W20EPR-U11 equivalent, along with having a clear understanding of gap measurement (.039′-.043′), elevates you from being merely an owner to being an integral part of your machine’s life cycle.

So remember, arm yourself with this knowledge and own every inch of your Honda GX340 experience!

Frequently Asked Questions

What is the typical lifespan of a Honda GX340 spark plug?

Typically, your Honda GX340 spark plug lasts around 300 hours of use. However, this lifespan is influenced by your usage and maintenance habits. Regular checks and cleanings can extend its service life significantly.

How can I tell if the spark plug on my Honda GX340 needs to be replaced?

Check your GX340’s spark plug for signs of wear or damage. Look for a worn electrode, cracked insulator, or carbon buildup. If it misfires, has poor fuel economy, or has difficulty starting, it may need replacing.

Can I use a different brand of spark plug for my Honda GX340?

Sure, you can switch brands for your spark plug. However, it’s like swapping coffee beans – the essence remains, but the flavor changes subtly. Ensure the replacement matches Honda GX340’s specifications to maintain its performance.

How does a worn-out spark plug affect the performance of my Honda GX340?

A worn-out spark plug can seriously hamper your Honda GX340’s performance. It may cause misfires, poor fuel economy, trouble starting, and reduced power. Regularly checking and replacing spark plugs ensures your engine runs smoothly.

What are some common problems associated with the spark plug in a Honda GX340?

Common issues with your Honda GX340’s spark plug could include misfires, poor fuel economy, difficulty starting the engine, and lack of acceleration. These problems usually arise from fouled or worn-out plugs needing replacement.


So, you’ve got your trusty Honda GX340’s plug specs down pat, huh?

Ironically, it’s the tiny details like a spark plug gap and number that keep these beasts roaring.

You’d think something as mundane as a socket size wouldn’t matter much, but it’s everything in the world of engines! That little wrench is your key to smooth rides and pure power.

Remember to keep these golden nuggets handy for your next tune-up.

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