For years, spark plugs for mowers often lacked consistency, causing rough starts and poor fuel efficiency. That’s why I was excited to test the Genuine Spark Plug 98079-55846 for Honda Engines Generators—it proved to be a game-changer. After thorough hands-on testing, I found it delivers reliable sparks and smooth engine runs, even after months of use.
This OEM part, compatible with many Honda mowers, offers perfect fit and durable materials. The BPR5ES replacement proves more stable and long-lasting than generic plugs, preventing common issues like misfires or starting struggles. It’s easy to install and maintains engine performance, saving time and money in the long run. From my experience, you’ll notice improved starting power and smoother operation with this plug, making it an excellent choice for reliability.
Top Recommendation: Genuine Spark Plug 98079-55846 for Honda Engines Generators
Why We Recommend It: This product’s OEM quality ensures a perfect fit and durable performance. It’s compatible with a wide range of Honda engines, maintains stable sparks under load, and is built with high-quality materials that last longer than many competitors. Its consistent ignition and easy installation set it apart, making it the best choice for long-term mower performance.
Best brand spark plugs for mower: Our Top 5 Picks
- Craftsman CMXGZAM250017 RC12YC Spark Plug – Best for Lawn Mowers
- RC12YC Spark Plugs for Champion, Briggs, Kohler, JD Engines – Best for Small Engines
- LEFITPA 2-Pack Spark Plug for Toro 81-3250, NGK BPR6ES – Best Value
- Champion Spark Plugs for John Deere M78543, M87543, RC12YC – Best Spark Plugs for Garden Tractors
- Genuine Spark Plug 98079-55846 for Honda Engines Generators – Best Premium Option
Craftsman CMXGZAM250017 RC12YC Spark Plug
- ✓ Easy installation
- ✓ Improves engine performance
- ✓ Affordable price
- ✕ Requires seasonal replacement
- ✕ Basic design, no extra features
| Part Number Compatibility | Engine models including 5066K, 5092K, 496018S, 491055S, 696202, 699496, 71G, CHM71G, 531308128, M78543, 12 132 02-S, 4790 400 700, 21531100, RC12YC, RC14YC, RC12YX |
| Replaces | Part number 7133456 |
| Spark Plug Type | Resistor type with RC12YC and RC14YC designations |
| Electrode Gap | Typically 0.030 inches (inferred standard for RC12YC spark plugs) |
| Application | Compatible with small engine mowers and outdoor power equipment |
| Installation Tool | Spark plug wrench required |
As I carefully loosened the old spark plug with my trusty wrench, I noticed how gunked-up and worn out it looked—no wonder my mower was struggling to start on the first pull lately.
Swapping it out for the Craftsman CMXGZAM250017 RC12YC felt surprisingly straightforward. The plug’s ceramic insulator is solid, and it fits snugly into the engine bay without wobbling.
It’s a simple, no-fuss replacement that took me less than five minutes.
Once installed, I fired up the mower, and it roared to life with ease. The engine ran smoother, and I noticed a little more power in the cutting process.
The design seems built for durability, and I appreciate that it’s a reliable brand I can count on season after season.
Using the same wrench, I checked the gap, and it was spot-on right out of the box. The price is super reasonable, especially considering how often I need to replace spark plugs to keep my mower running like new.
Overall, I’d say this spark plug is a small but mighty upgrade for your mower. It’s not complicated, but it makes a noticeable difference in performance and fuel efficiency.
Just remember to replace it annually to avoid those annoying starting issues.
RC12YC Spark Plugs for Champion, Briggs, Kohler, JD Engines
- ✓ Easy to install
- ✓ Reliable performance
- ✓ Great value for money
- ✕ Not OEM parts
- ✕ May need rechecking fit
| Spark Plug Model | RC12YC |
| Compatibility | [‘Champion rc12yc’, ‘Briggs & Stratton 491055, 491055S, 692051, 792015, 72347GS, 805015, 499608, 491055T, 694385, 5066’, ‘Kohler 25 132 12-S, 25 132 12-A, 24 132 01-S, 12 132 02-S, 12 132 02, 531308128’, ‘John Deere M78543, 2829 71-1 711’, ‘Gravely 21525900, 21531100, 21534100, 21536800, 21537800, 21544000’] |
| Number of Plugs per Pack | 4 |
| Construction Material | High-quality materials with precision machining |
| Installation | Easy to install with accurate sizing for small lawn mower engines |
| Price | $9.99 |
| Type | Non-OEM replacement spark plugs |
Many folks assume that replacing spark plugs is a simple, almost insignificant task, but I quickly learned that choosing the right ones makes all the difference. When I fitted these RC12YC plugs into my mower, I noticed how snugly they fit—no fuss or guesswork needed.
Their compatibility list is impressive, covering Champion, Briggs, Kohler, and JD engines. It’s a relief knowing I can swap them out without hunting for the perfect fit every time.
The four-pack is super handy; I can keep extras on hand and save myself a trip to the store.
The build quality really stands out. These plugs feel solid, and the precision machining shows.
After a few weeks of use, I’ve seen steady, reliable performance—no misfires or rough running. They seem to help my mower run smoother and start quicker.
What I appreciate most is how easy they are to install. The size is just right, fitting effortlessly into my mower’s engine.
It’s a straightforward upgrade that feels like it’s extending the life of my equipment, especially during busy lawn care days.
Cost-wise, at under $10 for a pack of four, they’re a great deal. Plus, the brand’s support is responsive if I have any questions.
Overall, these spark plugs are a solid choice for keeping your mower in top shape without breaking the bank.
LEFITPA 2-Pack Spark Plug for Toro 81-3250, NGK BPR6ES
- ✓ Easy to install
- ✓ Reliable ignition
- ✓ Affordable price
- ✕ Limited to specific models
- ✕ No long-term testing data
| Part Number Compatibility | Toro 81-3250, NGK BPR6ES, 119-1901, 121-0186, 121-0396, 89947, ST31234, ST62113 |
| Number of Spark Plugs | 2 |
| Spark Plug Type | Standard spark plug (NGK BPR6ES equivalent) |
| Application | Lawn mower and small engine equipment |
| Warranty | 18-month worry-free warranty |
| Price | $11.99 for 2-pack |
When I first opened the LEFITPA 2-Pack Spark Plug, I immediately noticed how solid and well-made they felt in my hand. The black ceramic insulator and shiny metal tip looked premium, promising durability.
I was curious how they’d perform, especially since they’re designed to fit Toro mowers and match NGK BPR6ES specs.
Installing these plugs was straightforward—screwing them in felt smooth, and they fit snugly into my mower’s engine. I’ve used them for a few mowing sessions now, and I can say they ignite quickly and keep the engine running smoothly.
No misfires or rough idling, even after extended use.
What’s really impressive is how well they handle heat. My old plugs would sometimes sputter after a while, but these stay consistent, even during hot days.
Plus, the price point makes it easy to replace them regularly without breaking the bank.
The package includes two plugs, which is handy for quick replacements or keeping a spare. Plus, LEFITPA offers a 30-day money-back guarantee and an 18-month warranty, giving you peace of mind.
Overall, they’re reliable, simple to install, and seem built to last, making yardwork a little less frustrating.
If you’re tired of dealing with old, worn-out spark plugs that cause rough starts or poor performance, these are worth a try. They definitely improve engine smoothness and reliability, which is what you need for an easier mowing experience.
Champion Spark Plugs for John Deere M78543, M87543, RC12YC
- ✓ Perfect fit for John Deere
- ✓ Easy to install
- ✓ Improves engine performance
- ✕ Slightly pricier than generic plugs
- ✕ Limited to specific models
| Brand | Champion |
| Model Numbers | [‘M78543’, ‘M87543’, ‘RC12YC’] |
| Application | John Deere Mower |
| Type | Spark Plug |
| Price | $8.18 |
| Designation | Original Equipment (OE) for John Deere |
It’s early Saturday morning, and I’m crouched beside my mower, trying to get it started after a long week of neglect. As I pull the cord, I notice the old spark plug isn’t giving the same spark it used to.
That’s when I decided to swap in the Champion Spark Plug for my John Deere, model M78543.
The fit is perfect—no fiddling or extra adjustments needed. The ceramic center electrode looks sturdy, and the metal shell feels solid in my hand.
Once installed, I fire up the mower, and it roars to life smoothly, without the usual hesitation or rough idling.
I’ve used cheaper plugs before, but this one really makes a difference in how effortlessly the engine runs. Starting is quicker, and the engine sounds more responsive.
Plus, it’s built specifically for John Deere models, so I know it’s designed to handle the conditions I throw at it.
Maintenance feels simpler now—I don’t have to worry about misfires or poor fuel economy. It’s a small part, but it makes a big difference in how my mower performs during yard work.
At $8.18, it’s a small investment for reliable, consistent starts. The build quality gives me confidence that it’ll last through many seasons.
Overall, it’s one of those upgrades that quietly improves your mower’s efficiency every time you use it.
Genuine Spark Plug 98079-55846 for Honda Engines Generators
- ✓ Reliable OEM quality
- ✓ Easy to install
- ✓ Good value pack
- ✕ Not suitable for non-Honda engines
- ✕ Slightly pricier than generic plugs
| OEM Part Number | 98079-55846 |
| Compatibility | Honda Engines GX120, GX140, GX160, GX200, GX240, GX270, GX340, GX390 |
| Type | BPR5ES (NGK equivalent) |
| Package Quantity | 2 pieces |
| Material | Copper core with nickel plating |
| Application | Lawn mowers and small engines |
As soon as I pulled these spark plugs out of the packaging, I was struck by how solid they felt in my hand. The shiny metal surface caught the light, and the ceramic insulator looked perfectly smooth—no rough spots or blemishes.
They weigh just enough to feel premium, but not heavy or bulky.
Installing them was straightforward. The threads screw in easily, with a bit of that satisfying resistance that tells you it’s snug but not over-tightened.
I appreciated the OEM part number printed clearly on the side—easy to verify. The fit for my Honda mower engines — from GX120 to GX390 — was spot-on, and I didn’t need to tweak anything.
Once in, I fired up the mower, and it started smoothly without any hiccups. The engine ran noticeably more responsive, with a steady idle and no misfires.
It’s clear these plugs deliver reliable spark, which is exactly what you want for those long mowing sessions or quick fixes.
What stood out is that they come in a pack of two, so I don’t have to worry about running out anytime soon. The price is pretty reasonable for OEM quality, especially considering how much smoother my mower runs now.
Plus, knowing they’re compatible with a wide range of Honda engines makes them versatile and a smart investment.
Overall, these spark plugs give me confidence that my mower will keep running well. They’re simple, effective, and well-made—just what you need for maintenance that actually makes a difference.
What Factors Determine the Best Spark Plugs for Mowers?
The best spark plugs for mowers are determined by several key factors:
- Compatibility: It’s crucial to choose spark plugs that are specifically designed for your mower’s make and model. Using incompatible plugs can lead to poor performance, increased emissions, and even engine damage.
- Material: Spark plugs are made from various materials such as copper, platinum, and iridium. Platinum and iridium plugs offer better durability and longevity compared to copper, making them ideal for high-performance mowers that require consistent operation over time.
- Heat Range: The heat range of a spark plug affects how quickly it dissipates heat from the combustion chamber. Selecting the correct heat range ensures that the spark plug performs optimally under the mower’s operating conditions, preventing fouling and misfiring.
- Gap Size: The gap between the center and ground electrode must be set correctly to ensure efficient ignition. Different engines require specific gap sizes, and using the wrong one can lead to starting difficulties and reduced efficiency.
- Brand Reputation: Choosing reputable brands that are known for producing high-quality spark plugs can significantly influence performance and reliability. Brands like NGK, Champion, and Bosch have established themselves as trusted names in the industry.
- Price: While it can be tempting to go for the cheapest option, investing in higher-quality spark plugs often pays off in terms of longevity and performance. Balancing cost with quality is essential for the best outcome.
How Do Different Spark Plug Types Impact Mower Performance?
Different spark plug types can significantly impact mower performance by affecting ignition efficiency, fuel consumption, and engine reliability.
- Standard Copper Spark Plugs: These are the most common type used in mowers, featuring a copper core that provides good conductivity and heat dissipation. They have a shorter lifespan compared to other types, typically lasting about 20,000 miles, making them more suitable for budget-friendly mowers or those with lower usage.
- Platinum Spark Plugs: These plugs offer improved durability and longevity, with a lifespan of up to 100,000 miles due to the platinum tip that resists wear and corrosion. They provide a more stable spark and can lead to better fuel efficiency and smoother engine performance, making them ideal for high-performance mowers.
- Iridium Spark Plugs: Known for their exceptional durability, iridium plugs have a very fine center electrode that provides a powerful spark even in extreme conditions. Their lifespan can reach up to 120,000 miles, and they are particularly effective in enhancing throttle response and overall engine efficiency, making them a top choice for serious mower enthusiasts.
- Resistor Spark Plugs: These plugs are designed to reduce electromagnetic interference, which can be beneficial for modern mowers equipped with electronic ignition systems. They help ensure a consistent spark while minimizing radio frequency interference, thus improving the reliability of mower performance.
- Multi-Ground Spark Plugs: These plugs feature multiple ground electrodes, which can provide improved ignition consistency and reduce fouling over time. They are particularly useful in mowers that experience varying engine loads, helping maintain performance across different operating conditions.
What Role Does Spark Plug Material Play in Performance and Longevity?
The material of spark plugs significantly influences their performance and longevity, particularly for mowers.
- Copper: Copper spark plugs feature a copper core that provides excellent thermal conductivity and conductivity for a strong spark. However, they tend to wear out faster than other materials, making them less ideal for prolonged use in mowers that require consistent performance over time.
- Platinum: Platinum spark plugs are known for their durability and resistance to wear, making them a preferred choice for many mower brands. The platinum tip helps maintain a stable spark and can last up to 100,000 miles, which is beneficial for mowers that see frequent use, but they may come at a higher cost.
- Iridium: Iridium spark plugs offer the best longevity and performance due to their high melting point and resistance to corrosion. These plugs can last over 100,000 miles and provide a consistent spark, making them an excellent choice for high-performance mowers, although they are typically the most expensive option.
- Nickel: Nickel spark plugs are often used in standard applications and offer good performance at a lower cost. While they may not last as long as platinum or iridium plugs, they are reliable for everyday use in mowers and can be easily replaced when needed.
- Multi-ground electrodes: These spark plugs feature multiple ground electrodes, which can improve ignition efficiency and enhance overall performance. They are designed to provide a more stable spark under various operating conditions, making them suitable for mowers that may face variable loads.
Which Brands Are Renowned for Quality Mower Spark Plugs?
The best brands renowned for quality mower spark plugs include:
- Champion: Champion spark plugs are well-known for their durability and performance in various engine types, including lawn mowers. They offer a wide range of plugs designed specifically for small engines, ensuring optimal ignition and fuel efficiency.
- NGK: NGK is a leading manufacturer recognized for its high-quality spark plugs that provide excellent performance and reliability. Their products are engineered to withstand extreme temperatures and conditions, making them a popular choice among lawn care professionals and enthusiasts alike.
- Bosch: Bosch spark plugs are designed with advanced technology to enhance engine performance and longevity. Their plugs feature superior materials and innovative designs that help improve ignition efficiency, which is critical for lawn mower engines that require consistent starting and operation.
- Denso: Denso is known for producing spark plugs with high-quality construction and innovative features. Their plugs often incorporate technologies that promote better fuel combustion and reduce emissions, making them an environmentally friendly option for mower maintenance.
- Briggs & Stratton: As a leading manufacturer of small engines, Briggs & Stratton produces spark plugs specifically for their engines, ensuring compatibility and optimal performance. Using their branded plugs can help maintain the warranty and reliability of your mower.
What Unique Features Make Champion Spark Plugs Stand Out for Mowers?
Champion spark plugs are recognized for their reliability and performance, particularly in mower applications.
- Durability: Champion spark plugs are built to withstand high temperatures and harsh conditions, making them ideal for lawn mowers that operate in varied environments.
- Precision Engineering: Each plug is designed with advanced materials and manufacturing techniques to ensure optimal ignition performance, which translates to better fuel efficiency and reduced emissions.
- Wide Range of Options: Champion offers a diverse selection of spark plugs tailored to different mower models, ensuring compatibility and optimal performance across various engine types.
- Easy Installation: Designed with user-friendly features, these spark plugs can be easily installed by homeowners without specialized tools, promoting hassle-free maintenance.
- Proven Track Record: With decades of experience in the industry, Champion has established a reputation for reliability and effectiveness, making it a trusted brand among mower enthusiasts.
Durability is a key feature of Champion spark plugs as they are engineered to resist wear and tear from extreme temperatures and vibrations, which are common in lawn mower operation. This longevity helps reduce the frequency of replacements, ultimately saving time and money for the user.
The precision engineering behind Champion spark plugs involves the use of high-quality materials that promote efficient ignition and combustion. This leads to enhanced engine performance, enabling the mower to operate smoothly while also reducing harmful emissions, thereby contributing to a cleaner environment.
Champion’s wide range of options ensures that there is a suitable spark plug for virtually every mower model available on the market. This adaptability means that users can find the right fit for their equipment, which is crucial for maintaining optimal engine health and performance.
Installation is simplified with Champion spark plugs, which often feature designs that allow for quick and easy replacement without requiring professional assistance. This ease of use empowers mower owners to perform their own maintenance and keep their equipment running efficiently.
Lastly, Champion’s proven track record in the spark plug industry enhances its credibility as a brand. Users can have confidence in the performance and reliability of Champion products, knowing that they are backed by years of expertise and positive customer feedback.
Why Are NGK Spark Plugs a Top Choice for Mower Owners?
NGK Spark Plugs are a top choice for mower owners primarily due to their superior performance, reliability, and advanced engineering that caters specifically to small engine applications.
According to a study by the Engine Manufacturers Association, NGK is recognized as a leading brand in the spark plug market, largely because of their commitment to quality and innovation. Their plugs are designed to enhance ignition efficiency and improve fuel combustion, which is critical for the performance of small engines found in mowers.
The underlying mechanism for NGK’s success lies in their use of advanced materials and design techniques. For instance, NGK spark plugs often feature enhanced insulator designs and high-quality electrode materials that resist wear and fouling. This results in a longer lifespan and consistent performance over time, reducing the frequency of replacements and maintenance for mower owners. Additionally, the precise engineering of these spark plugs ensures optimal spark generation, which translates to better starting, improved throttle response, and increased fuel efficiency—key factors that mower users prioritize.
Moreover, NGK has a broad range of products that cater to specific engine types and conditions, allowing mower owners to select the best spark plug suited for their particular model. Research by the American Society of Agricultural and Biological Engineers highlights that using the correct spark plug can significantly enhance engine performance and longevity. This adaptability and attention to detail further solidify NGK’s position as a preferred choice among mower enthusiasts.
What Benefits Do Bosch Spark Plugs Offer for Lawn Mowers?
Bosch spark plugs provide several benefits that make them a top choice for lawn mower performance.
- Improved Engine Performance: Bosch spark plugs are designed to enhance combustion efficiency, which can lead to a more powerful engine performance. This improvement can result in smoother operation and better overall power output for your lawn mower.
- Longer Lifespan: Made with high-quality materials, Bosch spark plugs are built to endure high temperatures and pressures, offering a longer lifespan compared to standard plugs. This durability means fewer replacements and reduced maintenance costs over time.
- Better Fuel Efficiency: By optimizing the combustion process, Bosch spark plugs can help your lawn mower consume less fuel. This efficiency not only saves money at the pump but also reduces the environmental impact of mowing.
- Easy Installation: Bosch spark plugs are designed to fit a wide range of lawn mower models, making installation straightforward. This user-friendly aspect allows even novice users to replace their spark plugs without requiring professional assistance.
- Consistent Performance: With advanced engineering, Bosch spark plugs provide reliable ignition under various operating conditions, ensuring that your lawn mower starts easily and runs consistently. This reliability is crucial for maintaining a well-kept lawn without interruptions.
How Do Mower Owners Rate Their Experiences with Various Spark Plug Brands?
Mower owners often have varied experiences with different spark plug brands, impacting their choice for optimal performance.
- Champion: Champion spark plugs are well-regarded for their reliability and performance in various mower types. Many users highlight their long lifespan and ability to start easily in challenging conditions, making them a popular choice among lawn care professionals and homeowners alike.
- NGK: NGK is frequently praised for its high-quality engineering and consistent performance. Mower owners report smoother engine operation and improved fuel efficiency, reinforcing NGK’s reputation as a leading spark plug brand in the industry.
- ACDelco: ACDelco spark plugs are known for their durability and value. Users appreciate their affordability without compromising on performance, making them a favored option for those looking to maintain their mowers on a budget.
- E3: E3 spark plugs are designed with innovative technology aimed at enhancing combustion efficiency. Many mower owners have noted increased power and reduced emissions, which can lead to a more environmentally friendly mowing experience.
- Briggs & Stratton: As a major manufacturer of small engines, Briggs & Stratton spark plugs are often recommended for their compatibility and performance with their own engine models. Mower owners tend to favor these plugs for their specific fit, ensuring optimal engine performance and reduced maintenance issues.
- Bosch: Bosch spark plugs are recognized for their advanced technology and high performance. Users report better ignition and increased engine responsiveness, making them a strong contender for those seeking enhanced mowing efficiency.
What Are the Best Practices for Installing and Maintaining Spark Plugs in Mowers?
Best practices for installing and maintaining spark plugs in mowers are essential for optimal performance and longevity.
- Choosing the Right Spark Plug: Select spark plugs that match the manufacturer’s specifications for your mower, as using the wrong type can lead to poor performance or engine damage. Brands like NGK and Champion are often recommended for their reliability and compatibility with various mower engines.
- Proper Installation: Ensure that spark plugs are installed correctly by hand-tightening them to avoid cross-threading and using a torque wrench for the final tightening per the manufacturer’s recommendations. This prevents damage to the threads and ensures a proper seal, which is crucial for engine efficiency.
- Regular Inspection: Periodically check spark plugs for signs of wear, such as carbon buildup, erosion, or discoloration, as these can indicate engine issues or the need for replacement. Regular inspections help in identifying problems early and maintaining optimal engine performance.
- Cleaning Spark Plugs: If the spark plugs are not severely worn, they can often be cleaned with a wire brush or a specialized spark plug cleaner. Removing carbon deposits and other contaminants can restore functionality and prolong the life of the plugs.
- Replacing at Recommended Intervals: Follow the manufacturer’s guidelines for when to replace spark plugs, typically every 25 to 100 hours of operation, depending on the mower type. Regular replacement helps ensure consistent starting and engine performance, reducing the risk of starting trouble or inefficient fuel consumption.
- Using Anti-Seize Compound: Applying a small amount of anti-seize compound on the threads of the spark plug can help prevent them from seizing in the engine. This practice is particularly useful for aluminum cylinder heads, where plugs can become stuck over time.