Removing a spark plug from a Honda lawn mower is a straightforward maintenance task that most homeowners can complete with basic tools and careful attention to safety. The process involves disconnecting the spark plug wire, using the correct socket size, and gently loosening the plug without damaging the engine threads. Many Honda walk-behind mowers use specific spark plug types, such as the BPR6ES or BPR5ES, which are designed for their small gas engines. Understanding the right procedure helps prevent common issues like stripped threads or oil leaks.
Before starting, ensure the mower is on a flat, stable surface and the engine is completely cool. This prevents burns and reduces the risk of accidental starting. You will need a spark plug socket wrench, typically 5/8 inch or 13/16 inch, depending on your specific Honda model.
Checking your owner’s manual for the exact plug size and torque specifications is a smart first step. If you are unsure about the model, our Honda lawn mower guide can help you identify the correct engine series. Taking your time with each step ensures a smooth removal and reinstallation process.
Pros
- Exact OEM fit guarantees no guesswork or adaptation needed
- Highly reliable starting and smooth engine performance
- Affordable price for genuine manufacturer part
- Long lifespan under normal use conditions
Cons
- Compatibility limited to specific Honda GCV engine models only
- May require gap verification before installation on some units
- Not a performance upgrade; purely a stock replacement plug
The Honda 98079-56846 (BPR6ES) spark plug is a genuine OEM replacement designed specifically for Honda GCV160 and GCV190 general purpose engines. These engines power a wide range of outdoor equipment, from push mowers and tillers to pressure washers and generators. If you own any Honda-powered gear in this engine family, this plug is the exact component the manufacturer intended.
This spark plug is best suited for homeowners who want to keep their equipment running reliably without costly trips to the repair shop. Replacing a worn or fouled plug solves common problems like hard starting, rough idling, and intermittent misfires. Experienced DIY users will appreciate the straightforward install: just remove the old plug, gap the new one if needed (typically pre-gapped), and tighten with a socket. No special tools are required.
In real-world use, this plug delivers instant ignition and consistent combustion. Users report that it cures long-standing starting issues and smooths out engine operation almost immediately. The OEM construction includes a nickel-alloy center electrode that resists carbon buildup and thermal degradation, so it holds up well across multiple seasons of regular mowing or tilling. The threaded shell and gasket seal tightly to prevent compression leaks, which helps maintain full engine power.
Build quality is typical of Honda parts: precise manufacturing, clean threads, and a solid crimp on the terminal. The plug itself is lightweight and compact, making it easy to store in a toolbox or glove compartment as a spare. While it does not offer any performance gain over a standard plug, that is exactly the point - it maintains the factory spec for reliable operation in everyday conditions.
One realistic limitation is that this plug only fits the specific engine models listed. If you have a different Honda engine (e.g., GXV, GC, or GX series), you will need to check cross-reference numbers. Additionally, some units may require a small gap adjustment before installation, as transit can occasionally shift the gap. Overall, for anyone maintaining a Honda GCV-powered mower or tiller, this genuine spark plug is a straightforward, inexpensive fix that restores performance and extends equipment life. It is a smart stock-up item for the workshop bench.
Brand: Honda
Model: 98079-56846 (BPR6ES)
Thread Size: 14mm (standard for small engines)
Reach: 19mm (3/4 inch)
Heat Range: 6 (medium)
Electrode Material: Nickel alloy
Gap: 0.028-0.031 inches (pre-set, verify before install)
Compatible Engines: Honda GCV160, GCV160A, GCV160A0, GCV160E, GCV160LE, GCV160LA, GCV160LA0, GCV190
Weight: 2 ounces
OEM Part Number: 98079-56846
Pros
- OEM quality ensures reliable engine operation and extends engine life.
- Copper core delivers strong spark even in cold weather or high humidity conditions.
- Easy to install with a standard spark plug socket, no special skills required.
- Wide compatibility across Honda small engine lineup, from mowers to pressure washers.
Cons
- Not suitable for engines that specifically require iridium or platinum plugs (check owner's manual).
- Copper core wears faster than precious metal plugs, so replacement intervals may be shorter.
- Only fits specific thread size and reach, so always verify engine requirements before buying.
If you own a Honda powered lawn mower, generator, or pressure washer, the Genuine Honda OEM BPR5ES Spark Plug (98079-55846) is the exact part that keeps your engine running smoothly. This copper core spark plug is designed to deliver consistent ignition, easy starts, and reliable operation for small engines used in workshops and garages worldwide.
This plug is best suited for homeowners and DIYers who maintain their own outdoor power equipment, as well as mechanics and small engine repair shops looking for a direct factory replacement. Because it is an OEM part, you eliminate the guesswork of cross-referencing aftermarket plugs, ensuring proper heat range and thread reach every time.
In real world use, the copper core provides reliable spark across a range of temperatures and humidity levels. Users will notice quick startups and smooth idling, which is especially important for equipment that sits for weeks between uses. The 14mm x 1.25mm threads are standard for many Honda small engines, making installation straightforward with a socket and ratchet.
Build quality is exactly what you expect from Honda. The plug is manufactured in Japan with tight tolerances, ensuring the gap is correct out of the box and the electrode materials are consistent. At just an ounce, it's light and easy to handle, and the retail packaging makes it simple to store in your toolbox or parts drawer.
The main drawback is that copper plugs don't last as long as iridium or platinum versions. If your engine calls for a longer life plug, this isn't the right choice. Also, because it is engine specific, you must confirm that your equipment uses the BPR5ES heat range and thread length. For routine seasonal maintenance on Honda powered gear, this OEM spark plug is a smart, no compromise option that prioritizes reliability over hype.
Pros
- Comfortable T-handle reduces hand strain during repeated use
- Swivel head allows access to spark plugs in cramped engine bays or small equipment
- Two sockets of each size give you backup or allow simultaneous use with a ratchet
Cons
- Plastic handle may not hold up as well as a full metal handle under heavy torque
- Only covers 16mm and 21mm sizes, so larger or smaller spark plugs are not included
- Generic brand quality control can vary; not ideal for daily professional use
This 5-piece spark plug socket wrench set is built to make quick work of spark plug swaps on small engines. The set includes a T-handle with a swivel joint, plus two 16mm and two 21mm sockets. It is designed for motorcycles, lawn mowers, snow blowers, leaf blowers, and other outdoor power equipment. If you do your own seasonal maintenance or tinker with small-engined vehicles, this is a practical add-on to your tool kit.
In real-world use, the T-handle offers a noticeable comfort advantage over a standard ratchet. The handle is thick enough to let you apply steady force without digging into your palm. The swivel joint on the handle rotates a full 360 degrees and folds 270 degrees, so you can reach spark plugs tucked behind frame rails or under covers. This flexibility is especially handy on lawn tractor engines and tight motorcycle cylinder heads. The sockets themselves are made from carbon steel that has been heat treated, so they hold up well to regular use.
Build quality is decent for the price. The plastic handle feels solid and the knurling gives good grip even with oily fingers. The sockets have a thick wall that clips onto the plug securely. One minor drawback is that the set only includes 16mm and 21mm sockets. While those two sizes cover the majority of small engines and older motorcycles, you will need separate tools for 14mm or 18mm plugs. Also, the generic brand means you are not getting the same fit and finish as a premium tool maker, but for light to medium use, it gets the job done.
If you are a weekend DIYer or a homeowner who wants a budget-friendly solution for changing spark plugs on your mower, ATV, or motorcycle, this set is worth considering. It eliminates the need to hunt for individual sockets and a T-handle, and the swivel feature saves time on awkward angles. Just keep in mind that for heavy daily shop use, a higher-end brand may last longer. But at this price point, it is a solid value that covers the basics well.
Pros
- Exact OEM fit for many Honda GX engines eliminates compatibility worries
- Good value with two plugs versus buying singles separately
- Installs easily with basic socket and gap tool; no modifications needed
Cons
- Only fits Honda engines listed, not universal for all small engines
- Copper core requires periodic replacement more often than iridium or platinum plugs
- Package includes two plugs; some users may need only one for a single-engine machine
The KINDZA genuine spark plug 98079-55846 is an OEM replacement for Honda small engines, designed to match the factory NGK BPR5ES specification. If you own a Honda-powered lawn mower, generator, pressure washer, or other equipment with a GX120, GX140, GX160, GX200, GX240, GX270, GX340, or GX390 engine, this plug is a direct swap. It’s a simple maintenance item that can bring back reliable starting and steady operation, especially if your current plug is fouled or worn.
This plug is best suited for DIY homeowners and small engine mechanics who work on Honda equipment. It’s not a performance upgrade, but it does exactly what a stock spark plug should do: provide a consistent spark for efficient combustion. In real-world use, you can expect smoother idling and quicker starts compared to a tired old plug. The copper core design is standard for this engine class and offers dependable service life if you stick to regular replacement intervals.
Build quality is straightforward – a steel shell, ceramic insulator, and copper center electrode. The plug comes pre-gapped, but it’s always wise to double-check with a feeler gauge before installation. The pack of two is a nice bonus for anyone maintaining multiple Honda engines or as a backup for the inevitable annual change. Installation takes about five minutes with a socket and ratchet, making it an easy weekend job.
One realistic limitation is that these plugs aren’t made from long-life materials like iridium, so you’ll need to replace them every season or every 100 hours of use, depending on your equipment. Also, the pack of two may be overkill if you only own one engine – you’ll have a spare, which isn’t a bad thing. But if you need a single plug, you’re still getting a fair deal.
Overall, the KINDZA 98079-55846 is a smart buy for anyone keeping Honda small engines in peak condition. It’s a no-fuss, factory-spec part that does its job without surprises. Pair it with a fresh air filter and oil change for a complete tune-up that keeps your mower or generator running strong through the season.
Pros
- Genuine OEM part guarantees compatibility with Honda engines and many other small engines.
- High build quality and materials provide reliable performance over many hours of use.
- Improves engine start-up consistency and reduces rough idling.
- Simple replacement process requires no special skills or tools.
Cons
- Price is higher than many aftermarket or generic alternatives.
- Not a universal fit; you must verify it matches your specific engine model (BPR6ES type).
- Does not provide a performance boost it is a standard replacement part for maintaining factory specs.
The Honda 98079-56846 spark plug is an OEM replacement part designed specifically for walk-behind mowers and other small engines that require a BPR6ES plug. While it is not a power tool itself, it is an essential maintenance component for the engines that power mowers, generators, pressure washers, and other workshop equipment. This plug is built to Honda's exact specifications and manufactured in Japan, ensuring consistent fit and function.
In real-world use, this spark plug delivers reliable ignition that helps engines start quickly and run smoothly. Homeowners and contractors who maintain their own small engine equipment will notice a difference in idle stability and throttle response compared to worn plugs. The consistent spark also contributes to better fuel efficiency and lower emissions, which is especially important for frequent use on larger properties or jobsites.
Build quality is a standout here. The shell is nickel-plated to resist corrosion, and the center electrode is made from a durable nickel alloy that withstands high heat and electrical erosion. Honda's rigorous quality control means each plug meets tight tolerance for gap and thread depth, reducing the risk of misfires or installation issues. This level of reliability matters when you are working under a deadline and need your equipment to perform.
Installation is straightforward with a standard plug socket and torque wrench (hand-tighten plus a quarter turn). The main drawback is the price, which is higher than many aftermarket plugs like NGK or Champion. However, for those who value OEM peace of mind and want to avoid compatibility guesswork, the cost is justified. It is also worth noting that this plug is not a performance upgrade it simply restores your engine to proper operating condition.
Overall, the Honda OEM BPR6ES spark plug is a smart investment for DIYers, landscapers, and anyone who relies on small engines for daily work. If you want a direct fit replacement that maintains your equipment's efficiency and longevity, this plug delivers exactly what it promises no more, no less.
Removing the spark plug is a critical part of routine maintenance for Honda lawn mowers. It allows you to inspect for wear, clean carbon buildup, or replace the plug if it is no longer firing correctly. The process is similar across most Honda GCV and GX engine series, but slight variations in access and plug size can occur.
This guide breaks down the procedure into clear, manageable steps to help you complete the task safely and efficiently. Always prioritize safety by ensuring the engine is off and the spark plug wire is disconnected to prevent accidental ignition.
| Component | Typical Specification | Note |
|---|---|---|
| Spark Plug Size | 5/8 inch or 13/16 inch | Check manual for exact size |
| Common Plug Types | BPR6ES, BPR5ES | Varies by engine model |
| Tool Needed | Spark Plug Socket Wrench | T-handle or ratchet compatible |
| Engine Condition | Cool and Off | Prevent burns and injury |
Start by gathering the necessary tools and ensuring your workspace is clean and well-lit. A spark plug socket wrench is the primary tool required, and having a set of different sizes can be helpful if you are unsure of the exact fit. It is also useful to have a pair of pliers for handling the spark plug wire boot. Before you begin, verify that the mower is positioned on a flat surface to prevent it from rolling. This initial preparation sets the stage for a smooth and safe removal process.
- Ensure the engine is completely off and cool to the touch.
- Disconnect the spark plug wire from the plug terminal.
- Locate the spark plug on the engine block.
- Inspect the area for dirt or debris around the plug.
- Prepare a clean workspace for the removed plug.
Identifying the Correct Spark Plug Location and Size
The spark plug is typically located on the side of the engine, near the top. On Honda GCV160 and GCV190 engines, it is often accessible from the side without removing any major components. However, on some models, you may need to remove a small cover or adjust the position of the mower to reach it comfortably.
Knowing the exact location saves time and prevents unnecessary disassembly. The size of the plug varies by engine, with 5/8 inch being common for many walk-behind mowers. Always confirm the size using your owner’s manual or by measuring the old plug if you are replacing it.
Using the wrong socket size can strip the plug threads or damage the engine head, so accuracy is crucial. If you do not have the correct socket, a universal spark plug tool with multiple sizes may be a good investment. These tools often feature a flexible swivel joint that helps access tight spaces.
For Honda GX series engines, the plug size may differ slightly, so double-checking is essential. If you are unsure, our lawn mower maintenance guide offers additional tips on identifying engine components. Taking a moment to verify these details ensures a successful removal.
Disconnecting the Spark Plug Wire Safely
Before touching the spark plug itself, you must disconnect the spark plug wire. This step is critical for safety, as it prevents any accidental spark that could ignite fuel vapors or cause the engine to start. Grip the wire boot firmly and pull it straight off the plug terminal.
Avoid twisting or pulling on the wire itself, as this can damage the internal connections. If the boot is stuck, gently wiggle it while pulling to release it. Once disconnected, move the wire away from the plug area to keep it out of the way.
Some Honda models have a locking clip or tab on the wire boot that secures it to the plug. If present, you may need to press the tab to release the boot. This mechanism is designed to ensure a secure connection during operation, but it can make removal slightly more challenging.
Be patient and apply even pressure to avoid breaking the plastic tab. After disconnecting, inspect the wire for any signs of wear or damage. If the wire is frayed or cracked, consider replacing it to maintain reliable engine performance. This simple step adds an extra layer of safety to your maintenance routine.
Using the Spark Plug Socket Wrench Correctly
Once the wire is disconnected, you can proceed to remove the spark plug using a socket wrench.
- Select the correct socket size and place it over the plug, ensuring it is fully seated to avoid slipping.
- Turn the wrench counter-clockwise to loosen the plug, applying steady pressure rather than forcing it to avoid stripping threads.
- Some plugs may have carbon buildup that makes them harder to remove, so patience is key during the process.
- If the plug does not budge, you can try using a penetrating oil, but allow it to sit for a few minutes before attempting again.
As the plug loosens, continue turning until it is free. Be careful not to drop the plug or let it fall into the engine. Once removed, inspect the plug for any signs of wear, such as a cracked insulator or eroded electrode. This inspection can provide valuable information about the engine’s condition.
If the plug is heavily fouled with oil or carbon, it may indicate a deeper issue that needs attention. Cleaning the plug or replacing it is the next logical step. Proper use of the tool ensures that you do not damage the engine threads, which can be costly to repair.
Inspecting and Cleaning the Spark Plug
After removing the spark plug, take a close look at its condition. The electrode should be clean and free of excessive carbon buildup. If there is a thick layer of black or brown residue, the plug may need cleaning or replacement. You can use a wire brush or a spark plug cleaner to remove the buildup.
Be gentle to avoid damaging the electrode. If the insulator is cracked or the threads are stripped, the plug should be replaced immediately. A damaged plug can cause engine misfires or poor performance, so addressing this issue promptly is important for maintaining your mower’s efficiency.
Check the gap between the electrode and the ground strap using a gap tool. The correct gap is usually specified in the owner’s manual, often around 0.028 to 0.034 inches for Honda engines. If the gap is too wide or too narrow, adjust it carefully with the gap tool.
An incorrect gap can affect the spark’s strength and the engine’s overall performance. If you are replacing the plug, ensure the new one is the correct type and heat range. Using the wrong plug can lead to pre-ignition or engine damage. This inspection step is a quick way to identify potential issues before they become major problems.
Reinstalling the Spark Plug and Wire
Once the plug is cleaned or replaced, it is time to reinstall it. Thread the plug into the engine by hand first to ensure it is aligned correctly. This prevents cross-threading, which can damage the engine head. Once it is hand-tight, use the socket wrench to tighten it to the manufacturer’s specified torque.
Over-tightening can strip the threads, while under-tightening can cause leaks. A torque wrench is ideal for this step, but a standard wrench with careful attention is usually sufficient. After tightening, reconnect the spark plug wire by pushing the boot firmly onto the plug terminal until it clicks or locks into place.
Ensure the wire is secure and not kinked or damaged. Route the wire back to its original position to avoid interference with other components. Start the engine and listen for any unusual sounds or misfires. If the engine runs smoothly, the installation was successful.
If there are issues, double-check the plug gap and the wire connection. Regular maintenance of the spark plug helps ensure reliable starting and consistent performance. By following these steps, you can keep your Honda lawn mower running efficiently for years to come. This routine task is a small investment in your equipment’s longevity.
Common Mistakes to Avoid During Removal
One of the most common mistakes is using the wrong socket size, which can strip the plug threads. Always verify the size before starting to avoid costly repairs. Another frequent error is forgetting to disconnect the spark plug wire, which can lead to accidental engine starting.
This is a serious safety hazard that should never be overlooked. Additionally, forcing a stuck plug without using penetrating oil can damage the engine head. If the plug is seized, apply oil and wait before trying again. These mistakes are easy to avoid with proper preparation and attention to detail.
Ignoring the condition of the spark plug is another oversight that can lead to engine problems. A worn or damaged plug can cause misfires, poor fuel efficiency, and difficult starting. Regular inspection and replacement as needed are key to maintaining engine health.
Also, failing to check the plug gap can result in suboptimal performance. Ensure the gap is within the manufacturer’s specifications before reinstallation. By avoiding these common pitfalls, you can ensure a smooth and safe maintenance process. Taking the time to do it right the first time saves time and money in the long run.
When to Replace the Spark Plug
Spark plugs are wear items that need to be replaced periodically. The recommended replacement interval varies by manufacturer and usage, but a general guideline is every 100 to 300 hours of operation. If you notice symptoms like hard starting, misfires, or poor fuel economy, it may be time to replace the plug. Inspecting the plug during maintenance can give you a clear indication of its condition. A plug with a heavily eroded electrode or cracked insulator should be replaced immediately. Using a new plug ensures optimal engine performance and reliability.
Choosing the correct replacement plug is crucial for maintaining engine health. Honda recommends using genuine OEM plugs, such as the BPR6ES or BPR5ES, for their specific engine models. These plugs are designed to meet the exact specifications of the engine, ensuring proper fit and performance.
Aftermarket plugs may be available, but they may not offer the same level of quality or compatibility. Always refer to your owner’s manual for the recommended plug type. Replacing the plug at the right time helps prevent more serious engine issues and extends the life of your mower. This simple task is a key part of responsible equipment maintenance.
Safety Tips for Mower Maintenance
Safety should always be the top priority when performing any maintenance on your lawn mower. Ensure the engine is completely off and the key is removed before starting any work. Allow the engine to cool down to prevent burns from hot components. Wear appropriate protective gear, such as gloves and safety glasses, to protect yourself from debris and chemicals. Keep your workspace clean and organized to prevent trips or falls. These basic safety measures help ensure a safe and efficient maintenance session.
Be cautious when handling fuel and oil, as they can be slippery and harmful if ingested or inhaled. Use a container to catch any spills and dispose of waste properly. If you are using penetrating oil or other chemicals, work in a well-ventilated area to avoid inhaling fumes.
Never attempt to service the mower while it is energized or capable of starting. Follow the manufacturer’s safety guidelines and use suitable protection or handling precautions. By prioritizing safety, you can perform maintenance with confidence and peace of mind. These practices protect both you and your equipment from potential harm.
Regular maintenance of your Honda lawn mower’s spark plug is a simple yet essential task that ensures reliable performance and longevity. By following the steps outlined in this guide, you can safely remove, inspect, and replace the spark plug with confidence.
Taking the time to do it correctly prevents common issues and keeps your mower running smoothly. If you encounter any difficulties, consulting the owner’s manual or seeking professional help is always a good option. Proper care of your equipment is a small investment that pays off in years of reliable service.
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