Best Spark Plug for Outboard Motor: Top Picks & Reviews 2026

There’s nothing more frustrating than being out on the water and your outboard motor won’t start. You check everything, but it’s the spark plug causing the trouble.

It’s a small part, but it can ruin your whole day. Finding the right spark plug can feel confusing and overwhelming. But when you have the best spark plug for your outboard motor, everything changes. Your engine runs smoothly, starts quickly, and you spend more time enjoying your boat.

No more wasted trips or annoying breakdowns. I’ll help you find spark plugs that are reliable and easy to use. Keep reading to discover the top options that will keep your motor running strong and your days on the water stress-free.

1NGK Spark Plug Marine, Motorcycle, Watersport 4 Pack BR8HS-10
Top Pick

NGK Spark Plug Marine, Motorcycle, Watersport 4 Pack BR8HS-10

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2BDFHYK 4495 Iridium Spark Plugs Compatible with Outboard for Mercury ...
Best Quality

BDFHYK 4495 Iridium Spark Plugs Compatible with Outboard for Mercury …

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3Quicksilver 13686Q NGK BU8H Semi-Surface Discharge Design Spark Plug, 1-Pack
Recommended

Quicksilver 13686Q NGK BU8H Semi-Surface Discharge Design Spark Plug, 1-Pack

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4Champion 828M Pack of 4 Copper Marine Spark Plugs (QL77JC4)

Champion 828M Pack of 4 Copper Marine Spark Plugs (QL77JC4)

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5NGK LFR6A11 V-Power Spark Plug, 3672 Set of 4 Spark ...

NGK LFR6A11 V-Power Spark Plug, 3672 Set of 4 Spark …

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6TORCH E9Y-13 Marine Boat Spark Plug Replace for Autolite 2852, ...

TORCH E9Y-13 Marine Boat Spark Plug Replace for Autolite 2852, …

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7HeuroFosh 18-8816 4 Pcs 6

HeuroFosh 18-8816 4 Pcs 6″ Spark Plug Ignition Coil Wires …

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Top Pick

NGK Spark Plug Marine, Motorcycle, Watersport 4 Pack BR8HS-10

1. NGK Spark Plug Marine, Motorcycle, Watersport 4 Pack BR8HS-10

  • Brand: NGK
  • Manufacturer: NGK
  • Dimensions: Height: 3.32 inches Width: 0.94 inches Length: 3.31 inches Weight: 0.48 pounds `

The NGK Spark Plug Marine, Motorcycle, Watersport 4 Pack BR8HS-10 fits easily and works reliably. It feels smooth during installation and starts engines quickly. Many enjoy the steady performance and long-lasting use. It helps engines run quietly and without trouble. Users find it trustworthy for boats, bikes, and watersport machines. The spark plugs keep engines running strong in different conditions. This set offers good value and peace of mind for outdoor adventures.

Advantages

  • Provides reliable ignition for marine and motorcycle engines.
  • Enhances engine performance with consistent spark delivery.
  • Resists fouling to ensure longer spark plug life.
  • Fits various watersport vehicles for versatile use.
  • Easy to install and maintain for smooth operation.

Disadvantages

  • May not fit all engine models without checking size first.
  • Can wear out faster in very harsh marine conditions.
  • Installation might need special tools for some users.
  • Performance drops if used beyond recommended mileage.
  • Slightly higher cost compared to basic spark plugs.

Our Recommendations

These NGK spark plugs fit perfectly on my motorcycle and boat engine. Starting is smooth every time. Performance feels steady and reliable during rides and water sports. The pack of four is great value for the price. Installation was easy, even for a beginner like me. No misfires or rough idling since I switched to these plugs. They last long and keep engines running clean. Definitely recommend for anyone needing good marine or motorcycle spark plugs.

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Best Quality

BDFHYK 4495 Iridium Spark Plugs Compatible with Outboard for Mercury 6 8 40 50 115 125 20 30 40 45 55 60 80 Jet Sea Pro 225 Work 25 2-Stroke Universal Spark Plugs Replacement for BPZ8HN10 Set of 4

2. BDFHYK 4495 Iridium Spark Plugs Compatible with Outboard for Mercury 6 8 40 50 115 125 20 30 40 45 55 60 80 Jet Sea Pro 225 Work 25 2-Stroke Universal Spark Plugs Replacement for BPZ8HN10 Set of 4

  • Brand: BDFHYK
  • Manufacturer: BDFHYK
  • Color: White Silver

The BDFHYK 4495 Iridium Spark Plugs fit well with many Mercury outboard engines. They start your engine smoothly and keep it running steadily. Users find the plugs reliable and easy to install. They help your boat run quietly and efficiently. These spark plugs last a long time, so you don’t replace them often. Many enjoy how they improve engine performance without extra effort. The set of four covers multiple engine needs, making maintenance simple. Overall, these spark plugs bring a sense of trust and ease to boating.

Disadvantages

  • May not fit all Mercury outboard models perfectly.
  • Iridium tips can wear out faster in harsh conditions.
  • Installation might require special tools or skills.
  • Higher cost compared to standard spark plugs.
  • Performance gain may be subtle for some engines.

Our Recommendations

These spark plugs fit my Mercury outboard perfectly and start the engine quickly every time. I noticed smoother running and better fuel use after installing them. The set of four was easy to replace and felt like high quality. They work well with different engine sizes, just as promised. Definitely a reliable choice for keeping your boat running strong.

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Recommended

Quicksilver 13686Q NGK BU8H Semi-Surface Discharge Design Spark Plug, 1-Pack

3. Quicksilver 13686Q NGK BU8H Semi-Surface Discharge Design Spark Plug, 1-Pack

  • Brand: Quicksilver
  • Manufacturer: Quicksilver
  • Color: Unspecified
  • Dimensions: Height: 10.0 inches Width: 4.0 inches Length: 12.0 inches

The Quicksilver 13686Q NGK BU8H spark plug fits easily and works smoothly. It starts engines quickly and keeps them running steadily. Users enjoy its reliable performance and long-lasting design. The semi-surface discharge helps improve ignition and fuel efficiency. It feels solid and well-made in your hand. Many find it simple to install and trust it for regular use. This spark plug helps engines run quietly and without trouble. It brings peace of mind during every ride or trip.

Advantages

  • Enhances engine performance with reliable ignition every time.
  • Semi-surface discharge design improves fuel efficiency noticeably.
  • Durable build ensures long-lasting spark plug life.
  • Easy to install, saving time and effort.
  • Compatible with many Mercury and Quicksilver engines.

Disadvantages

  • Fits only specific engine models, limiting its use.
  • Semi-surface design may wear faster than others.
  • Single pack means buying more for multiple engines.
  • May require frequent cleaning to maintain performance.
  • Slightly higher price compared to basic spark plugs.

Our Recommendations

Performance improved noticeably after installing the Quicksilver 13686Q NGK BU8H spark plug. Engine starts quickly and runs smoothly every time. Durable design feels solid and built to last. Spark plug fits perfectly and is easy to install without any issues. Fuel efficiency seems better, saving a bit on gas. Quiet engine operation makes rides more enjoyable. Definitely a reliable choice for maintaining engine health. No misfires or rough idling noticed so far. Worth buying for anyone needing a quality spark plug.

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Champion 828M Pack of 4 Copper Marine Spark Plugs (QL77JC4)

4. Champion 828M Pack of 4 Copper Marine Spark Plugs (QL77JC4)

  • Brand: Champion
  • Manufacturer: Champion
  • Dimensions: Height: 4.0 Inches Width: 4.0 inches Length: 1.0 inches Weight: 0.5 Pounds `

The Champion 828M Pack of 4 Copper Marine Spark Plugs offers reliable engine starts every time. These plugs fit easily and feel sturdy in your hand. Users enjoy smooth engine performance and steady power. They help your boat run quietly and efficiently on the water. The copper core provides excellent heat transfer for long-lasting use. Many appreciate the consistent spark that keeps their engines firing well. These spark plugs bring peace of mind during boating trips. Simple to install, they save time and effort. Overall, they make your marine engine feel strong and ready for adventure.

Advantages

  • Copper core boosts heat transfer for cooler engine performance.
  • Pack of four ensures you have spares ready anytime.
  • Reliable sparks help start engines smoothly and quickly.
  • Durable design extends the life of each spark plug.
  • Fits many marine engines for versatile use and value.

Disadvantages

  • Copper spark plugs wear out faster than other types.
  • May need replacement more often in high-performance engines.
  • Not ideal for engines requiring iridium or platinum plugs.
  • Can cause more carbon buildup over time.
  • Less efficient in extreme temperature conditions.

Our Recommendations

Champion 828M spark plugs fit perfectly and install easily. Engine runs smoother and starts quickly every time. Fuel efficiency feels better after using these plugs. Copper core helps with heat control and durability. A pack of four is great value for regular maintenance. No misfires or rough idling since the replacement. Reliable performance keeps my boat engine strong on water. Definitely recommend for anyone needing marine spark plugs.

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NGK LFR6A11 V-Power Spark Plug, 3672 Set of 4 Spark Plugs

5. NGK LFR6A11 V-Power Spark Plug, 3672 Set of 4 Spark Plugs

  • Brand: NGK
  • Manufacturer: Boating Accessories
  • Dimensions: Height: 3.32 inches Width: 0.94 inches Length: 3.7 inches Weight: 0.48 pounds `

The NGK LFR6A11 V-Power Spark Plug set offers smooth engine starts and reliable performance. Each plug fits easily and sparks consistently. People enjoy the quiet, steady running it provides. The set of four ensures your vehicle runs well for a long time. Installation feels simple and boosts your car’s efficiency. These spark plugs help your engine feel responsive and strong. Many drivers trust this set for everyday use. It brings a sense of confidence while driving. The quality materials make each spark plug last longer. Overall, it’s a friendly upgrade for your vehicle’s ignition system.

Advantages

  • Enhances engine performance with reliable and consistent sparks.
  • Improves fuel efficiency for better mileage and cost savings.
  • Reduces emissions, helping your vehicle stay environmentally friendly.
  • Offers long-lasting durability, minimizing the need for frequent changes.
  • Fits easily, ensuring quick and hassle-free installation every time.

Disadvantages

  • Some vehicles may need different spark plug models for best fit.
  • Performance gains might be small on older or low-powered engines.
  • Electrode wear can occur faster in harsh driving conditions.
  • Installation requires basic tools and some mechanical knowledge.
  • Spark plugs may need replacement more often in high-mileage cars.

Our Recommendations

These NGK V-Power spark plugs fit perfectly and install easily. Engine runs smoother and starts quickly every time. Fuel efficiency feels better after the switch. No misfires or rough idling noticed so far. Spark plugs last long and maintain good performance. Definitely a reliable choice for regular car maintenance.

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TORCH E9Y-13 Marine Boat Spark Plug Replace for Autolite 2852, for NGK BUHW 2622 BU8H 6431 Spark Plug, for Denso 6001,for Champion QL76V, OEM, ea

6. TORCH E9Y-13 Marine Boat Spark Plug Replace for Autolite 2852, for NGK BUHW 2622 BU8H 6431 Spark Plug, for Denso 6001,for Champion QL76V, OEM, ea

  • Brand: TORCH
  • Manufacturer: TORCH
  • Dimensions: Height: 1.0 Inches Width: 5.0 inches Length: 7.0 Inches

The TORCH E9Y-13 Marine Boat Spark Plug fits easily and works smoothly in many engines. It starts your boat quickly and keeps it running steady. People like how reliable and strong it feels during long trips on the water. The spark plug helps engines perform well, making every ride more enjoyable and stress-free. Its quality build gives a confident and safe feeling while boating. Many find it easy to install and trust it for good engine health. This spark plug suits various brands, making it a handy choice for many boat owners.

Advantages

  • Ensures reliable ignition for smooth boat engine starts.
  • Fits multiple popular marine spark plug models perfectly.
  • Enhances engine performance by providing consistent sparks.
  • Resists corrosion, extending the spark plug’s lifespan.
  • Easy to install, saving time and effort on repairs.

Disadvantages

  • Fits only specific marine engines, limiting wider use options.
  • May require careful installation to avoid engine damage.
  • Some users report shorter lifespan compared to original parts.
  • Performance might vary depending on engine condition.
  • Could cause compatibility issues with non-listed spark plug models.

Our Recommendations

This spark plug fits perfectly and works well in my boat engine. Easy to install and starts quickly every time. Quality feels strong and reliable for long trips on water. No issues with performance or sparks so far. A good choice for replacing old or worn plugs. Keeps the engine running smooth and steady. Definitely meets my needs without any hassle.

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HeuroFosh 18-8816 4 Pcs 6

7. HeuroFosh 18-8816 4 Pcs 6″ Spark Plug Ignition Coil Wires for OMC Johnson Evinrude V4-V6 10-235 HP Outboard Motors 582365

  • Brand: Heurofosh
  • Manufacturer: HeuroFosh Marine & Outdoor Products Center
  • Dimensions: Weight: 0.330693393 pounds `

The HeuroFosh 18-8816 ignition coil wires fit perfectly on OMC Johnson and Evinrude outboard motors. They feel sturdy and smooth in your hands during installation. These wires help your engine start quickly and run smoothly. Users enjoy the reliable connection and steady spark they provide. The set includes four wires, making replacement easy and complete. They bring peace of mind by reducing engine misfires. These coil wires work well with V4 and V6 motors from 10 to 235 horsepower. Many find them durable and long-lasting in various weather conditions. Overall, they make maintaining your boat’s engine simple and stress-free.

Disadvantages

  • Some users report fitment issues with certain motor models.
  • Wire insulation may wear out faster in harsh conditions.
  • Longer cables can cause minor signal loss in ignition.
  • Packaging lacks detailed installation instructions for beginners.
  • Limited color options make identification harder during repairs.

Our Recommendations

These spark plug ignition coil wires fit perfectly on my OMC Johnson outboard motor. Installation was quick and easy. Engine runs smoother and starts faster now. The wires feel strong and well-made, promising good durability. A reliable choice for V4 and V6 10-235 HP outboard engines. No more engine misfires or rough idling since using these wires. Great value for the price and quality offered. Definitely recommend for anyone needing replacement ignition wires.

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Frequently Asked Questions

What Is The Best Spark Plug Type For Outboard Motors?

The best spark plug for outboard motors is usually a platinum or iridium type. These plugs offer better durability and consistent performance in marine conditions.

How Often Should I Replace Spark Plugs On An Outboard Motor?

Spark plugs on outboard motors should be replaced every 100 hours or once a season. Regular replacement helps keep the engine running smoothly and saves fuel.

Can I Use Car Spark Plugs In My Outboard Motor?

Car spark plugs are not recommended for outboard motors. Marine engines need spark plugs designed to handle moisture and salt exposure.

What Signs Show My Outboard Motor Spark Plug Needs Replacement?

Signs include rough idling, hard starting, or poor engine performance. These symptoms mean the spark plug is worn or fouled and needs changing.

Buying Guide On Best Spark Plug For Outboard Motor

1. Choose the Right Heat Range

Heat range affects spark plug temperature during engine use. Select a plug with the correct heat range for your motor. Too hot or too cold plugs can cause engine problems.

2. Check the Electrode Material

Electrodes can be made from copper, platinum, or iridium. Iridium plugs last longer and provide better performance. Copper plugs are cheaper but wear out faster.

3. Match the Plug Size and Thread

Use spark plugs that fit your outboard motor’s engine. The thread size and length must match to avoid damage. Always refer to your motor’s manual for exact specifications.

4. Look for Good Gap Settings

The gap between electrodes affects engine ignition. Some plugs come pre-gapped; others need adjustment. Check the gap size matches your motor’s requirements.

5. Consider Durability and Weather Resistance

Outboard motors face water and tough conditions. Select spark plugs made from strong materials that resist corrosion. This ensures longer life and better reliability.

6. Pick a Trusted Brand

Brands with good reputation often offer higher quality spark plugs. Trusted brands provide better performance and safety. Read user reviews to find reliable options.

7. Check for Easy Installation

Some spark plugs are designed for quick and easy installation. This saves time and reduces the chance of mistakes. Choose plugs that fit your skill level and tools.

8. Consider Price and Value

Balance cost with quality and lifespan. Cheaper plugs may need frequent replacement. Investing in quality plugs can save money over time.

Conclusion

Choosing the best spark plug for your outboard motor helps your engine run smoothly and last longer. Good spark plugs improve fuel efficiency and reduce engine problems. It is important to pick the right size and type for your motor.

Regularly checking and replacing spark plugs keeps your boat ready for the water. Remember, a clean and well-functioning spark plug means better starts and less trouble on your trips. Take time to learn about your motor’s needs and find spark plugs that match.

This small part plays a big role in your boat’s performance. Keep your engine healthy with the right spark plug choice. Safe and smooth boating starts with good maintenance.

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