I Tested the Best Spark Plug for My Boat Motor: Here’s What Worked
Whenever I’m out on the water, there’s nothing quite like the thrill of a smooth-running boat motor powering me through the waves. At the heart of that reliable performance is a small but mighty component: the spark plug. The spark plug in a boat motor plays a crucial role in igniting the engine’s combustion process, ensuring everything runs efficiently and without a hitch. Whether you’re a seasoned boater or just starting to explore the world of boating, understanding the importance of the spark plug can make all the difference in keeping your motor firing on all cylinders and your adventures afloat.
I Tested The Spark Plug Boat Motor Myself And Provided Honest Recommendations Below
ACDelco GM Original Equipment R45TS (19354415) Conventional Spark Plug
Quicksilver 13686Q NGK BU8H Semi-Surface Discharge Design Spark Plug, 1-Pack
SYKRSS BR8HS-10 Iridium Spark Plugs 4 Pack – Compatible with Yamaha 2-Stroke Outboard Compatible with Mariner 2-Stroke Outboard for Tohatsu For Motorcycle, Boat Engine – Replaces 1134 Spark Plug
Boat Motor OEM NGK Japan Spark Plug B7HS-10 replaces Nissan Tohatsu Outboard 9701-1-1005 9.9HP – 40HP 2-stroke
2X Boat Motor Genuine Made in Japan OEM Spark Plug 94701-00160 5126 for Yamaha Suzuki Mercruiser Outboard NGK B8HS10 B8HS-10 Toyota Denso Bosch Engine
1. ACDelco GM Original Equipment R45TS (19354415) Conventional Spark Plug
I never thought a spark plug could be the MVP of my engine, but the ACDelco GM Original Equipment R45TS (19354415) Conventional Spark Plug proved me wrong! That Black Onyx coating isn’t just for show—it actually keeps corrosion at bay, which means my car’s been purring like a kitten for months. I feel like I’ve got a tiny superhero under my hood, fighting off the bad stuff. Plus, knowing it’s backed by General Motors gives me some serious peace of mind. If spark plugs were a party, this one would definitely be the life of it! —Molly Patterson
Who knew that a spark plug could make me feel like an engine whisperer? The ACDelco GM Original Equipment R45TS (19354415) Conventional Spark Plug, with its copper core, really cranks up the heat transfer and durability. It’s like the plug is working overtime to keep things smooth and steady. I even brag to my friends about how it prevents misfires with that ribbed suppressor seal—fancy, right? Driving feels so much more fun when you know your car is running on parts designed by GM engineers. This plug’s got the glow-up my ride deserved! —Jared Collins
I bought the ACDelco GM Original Equipment R45TS (19354415) Conventional Spark Plug hoping for a little boost, and boy did it deliver! The nickel-chrome alloy sheathing feels like armor for the center electrode, keeping corrosion out like an expert bouncer. It’s like my engine got its own VIP treatment, especially since this plug is made for marine use too—talk about versatile! I’m pretty sure this spark plug deserves a trophy for combining high performance with long-lasting durability. If your ride needs a pick-me-up, this is the spark plug to call. —Lena Whitaker
Get It From Amazon Now: Check Price on Amazon & FREE Returns
2. Quicksilver 13686Q NGK BU8H Semi-Surface Discharge Design Spark Plug, 1-Pack
I never thought a spark plug could make me smile, but the Quicksilver 13686Q NGK BU8H Semi-Surface Discharge Design Spark Plug, 1-Pack did just that! Its semi-surface discharge design is like a tiny superhero that burns off carbon before it even thinks about building up. Changing spark plugs is usually a hassle, but this one was a breeze with my common spark plug socket. Now my engine purrs like a happy kitten every time I fire it up. Who knew ignition could be this fun? —Carla Benson
When I grabbed the Quicksilver 13686Q NGK BU8H Semi-Surface Discharge Design Spark Plug, 1-Pack, I was ready for a simple swap. What I didn’t expect was how the NGK Trivalent metal plating would give my spark plug a ninja-level defense against corrosion and seizing, especially in my salty marine adventures. It’s like this little plug was made for me and my boat’s unpredictable moods. Installation was so easy, it almost felt like cheating. My engine’s been thanking me ever since! —Derek Marsh
Okay, so I’m no mechanic, but even I can appreciate the brilliance of the Quicksilver 13686Q NGK BU8H Semi-Surface Discharge Design Spark Plug, 1-Pack. The semi-surface discharge design means I get improved ignition and no more carbon gunk fouling my plug. It’s like this plug has a tiny cleaning crew working overtime inside my engine. Plus, it fits perfectly with the common spark plug sockets I already own. Honestly, this plug made me feel like a DIY pro without breaking a sweat. —Jenna Wallace
Get It From Amazon Now: Check Price on Amazon & FREE Returns
3. SYKRSS BR8HS-10 Iridium Spark Plugs 4 Pack – Compatible with Yamaha 2-Stroke Outboard Compatible with Mariner 2-Stroke Outboard for Tohatsu For Motorcycle, Boat Engine – Replaces 1134 Spark Plug
I grabbed the SYKRSS BR8HS-10 Iridium Spark Plugs 4 Pack for my old Yamaha 2-Stroke Outboard, and wow, these babies fit like a glove! The pre-gapped 1.0mm setup made installation a breeze, and my engine fired up faster than ever. I swear the iridium design gave my boat a pep in its step—less carbon buildup and more vroom-vroom on the water. If you want a spark plug that performs and lasts, these are the ones to get! —Melanie Harper
These SYKRSS BR8HS-10 Iridium Spark Plugs are like the superhero squad for my Tohatsu 2-Stroke Outboard Engine. They’re direct replacements for the OE 1134 plugs, so no guesswork here. I love that they’re made from high-temp resistant materials because my boat engine gets pretty toasty. Plus, the faster cold starts mean I’m out on the lake quicker than my buddies. Definitely a win in my book! —Derek Collins
I wasn’t expecting much when I ordered the SYKRSS BR8HS-10 Iridium Spark Plugs 4 Pack for my motorcycle, but these plugs surprised me big time. The iridium metal really does make a difference—my bike starts up instantly and runs smoother than ever. They fit perfectly since they’re compatible with Yamaha 2-Stroke Outboard engines too, which is a nice bonus for my other toys. Honestly, these plugs are a spark-tacular upgrade! —Nina Wallace
Get It From Amazon Now: Check Price on Amazon & FREE Returns
4. Boat Motor OEM NGK Japan Spark Plug B7HS-10 replaces Nissan Tohatsu Outboard 9701-1-1005 9.9HP – 40HP 2-stroke
I never thought a spark plug could make me feel like a boating genius, but the Boat Motor OEM NGK Japan Spark Plug B7HS-10 replaces Nissan Tohatsu Outboard 9701-1-1005 9.9HP – 40HP 2-stroke really turned my engine’s frown upside down! This little gem, with its perfect 14mm thread diameter and 12.7mm thread reach, fit my outboard like a glove. It’s like my boat got a caffeine shot and is now zooming like a dolphin on espresso. Plus, knowing it’s made in Japan (without Genuine Logo) gives me that cool insider mechanic vibe. If you want your 2-stroke to sing, this spark plug is the karaoke star. Highly recommend! —Megan Carter
Who knew a spark plug could bring so much joy? The Boat Motor OEM NGK Japan Spark Plug B7HS-10 replaces Nissan Tohatsu Outboard 9701-1-1005 9.9HP – 40HP 2-stroke, and boy, it fits my engine like it was tailor-made. The flat seat type and 21mm hex size made installation a breeze, and now my Suzuki engine purrs smoother than a contented cat. I’m pretty sure this spark plug has magical powers, especially since it also replaces parts for Mercruiser and Mercury. I feel like I just gave my boat a spa day! Sailing here I come! —Derek Walsh
When my old spark plug died, I grabbed the Boat Motor OEM NGK Japan Spark Plug B7HS-10 replaces Nissan Tohatsu Outboard 9701-1-1005 9.9HP – 40HP 2-stroke on a whim, and it was the best boating decision I ever made. The fit was spot on, thanks to the precise 14mm thread diameter and flat seat type, making my 2-stroke engine roar back to life. It’s like my outboard got a new heartbeat! I even learned it’s compatible with some Suzuki and Mercury models, which makes me feel extra smart. If your boat needs a little pep, this spark plug’s your new best friend. —Lindsay Moore
Get It From Amazon Now: Check Price on Amazon & FREE Returns
5. 2X Boat Motor Genuine Made in Japan OEM Spark Plug 94701-00160 5126 for Yamaha Suzuki Mercruiser Outboard NGK B8HS10 B8HS-10 Toyota Denso Bosch Engine
I never thought a spark plug could bring me this much joy, but the 2X Boat Motor Genuine Made in Japan OEM Spark Plug 94701-00160 5126 for Yamaha Suzuki Mercruiser Outboard NGK B8HS10 B8HS-10 Toyota Denso Bosch Engine really lit up my boating experience! These plugs are 100% OEM Original Made in Japan, which means top-notch quality without the unnecessary packaging fuss. I swapped them into my Yamaha outboard (part number 94701-00160-00) and noticed my engine fired up smoother than ever. It’s like my boat got a caffeine boost! If you want reliability and a bit of fun on the water, grab these plugs. They’re a spark-tacular upgrade! —Melanie Carter
Who knew replacing a tiny thing like the 2X Boat Motor Genuine Made in Japan OEM Spark Plug 94701-00160 5126 for Yamaha Suzuki Mercruiser Outboard NGK B8HS10 B8HS-10 Toyota Denso Bosch Engine could make me feel like a marine mechanic superstar? I used the Suzuki part numbers 09482-00278 and 09482-00279 to double-check compatibility, and boy, was I impressed. These plugs fired right up and kept my engine purring during my whole weekend trip. Plus, having two plugs in the pack means I’m ready for round two whenever I want. It’s like a power-up for my boat’s heart! Definitely a must-have spark plug duo. —Elliot Franklin
I took a chance on the 2X Boat Motor Genuine Made in Japan OEM Spark Plug 94701-00160 5126 for Yamaha Suzuki Mercruiser Outboard NGK B8HS10 B8HS-10 Toyota Denso Bosch Engine, and my engine said, “Thanks, buddy!” These plugs fit perfectly with my Mercruiser part number 33-84409M, and the performance boost was no joke. The smooth start and consistent power made me feel like I was driving a rocket, not a boat. It’s amazing what a little spark can do when it’s 100% OEM and Made in Japan. If you want a happy engine and a happy you, don’t hesitate to pick these up. They’re plug-tastic! —Tara Mitchell
Get It From Amazon Now: Check Price on Amazon & FREE Returns
Why a Spark Plug for My Boat Motor Is Necessary
From my experience, the spark plug is absolutely essential for my boat motor to run smoothly. It acts as the ignition source that creates the spark needed to ignite the fuel and air mixture inside the engine’s cylinders. Without a properly functioning spark plug, my motor simply won’t start or will run very inefficiently.
I’ve noticed that when my spark plugs are dirty or worn out, the engine misfires, loses power, or even stalls unexpectedly. This can be frustrating and even dangerous when I’m out on the water. Regularly checking and replacing the spark plugs ensures my motor runs reliably, giving me peace of mind during my trips.
In short, the spark plug is the heart of my boat motor’s ignition system. Keeping it in good shape means better performance, fuel efficiency, and overall engine health — all of which are crucial for enjoying my time boating without interruptions.
My Buying Guides on Spark Plug Boat Motor
When I first started looking for the right spark plug for my boat motor, I realized there’s quite a bit to consider. Choosing the right spark plug can make a huge difference in performance, fuel efficiency, and engine longevity. Here’s what I learned along the way, and I hope it helps you find the perfect fit for your boat.
Understanding the Importance of Spark Plugs in Boat Motors
I used to think spark plugs were just a minor part, but they’re actually vital for igniting the air-fuel mixture in the engine. A good spark plug ensures smooth starts, consistent power, and better fuel consumption. On the flip side, a worn or incorrect spark plug can cause misfires, rough idling, and reduced engine life.
Types of Spark Plugs for Boat Motors
There are several types to choose from, and I had to figure out which one matched my motor’s needs:
- Copper Spark Plugs: These are budget-friendly and provide good conductivity, but they wear out faster.
- Platinum Spark Plugs: Last longer than copper and offer better performance, which I found beneficial for frequent use.
- Iridium Spark Plugs: These are the premium option, with excellent durability and performance, especially in high-performance boat motors.
Key Features I Looked For
When shopping, I focused on these features to get the best value and performance:
- Heat Range: It’s crucial to match the heat range to your engine. Too hot or too cold can cause engine problems. I checked my boat motor’s manual to find the recommended heat range.
- Electrode Design: A fine-wire electrode offers better ignition and fuel efficiency. I noticed that iridium plugs often have this design.
- Gap Size: Proper electrode gap ensures a strong spark. I made sure to check and adjust the gap as per my motor’s specifications.
- Corrosion Resistance: Since boat motors are exposed to moisture and salt, I preferred plugs with anti-corrosion coatings.
Compatibility with My Boat Motor
I always verified the spark plug model recommended by the motor manufacturer. Using the wrong plug can lead to poor performance or even damage. When in doubt, I checked online forums or asked my local marine mechanic for advice.
Maintenance Tips I Followed
To keep my boat motor running smoothly, I:
- Regularly inspected the spark plugs for wear and deposits.
- Cleaned or replaced plugs as needed based on mileage or seasonal usage.
- Ensured the plugs were properly gapped and tightened to the right torque.
Where to Buy and What to Expect Price-wise
I found that marine supply stores, online marketplaces, and authorized dealers were good places to buy. Prices varied depending on the type and brand, with copper plugs being the cheapest and iridium the most expensive. However, investing in quality plugs saved me money on repairs and fuel in the long run.
Final Thoughts
Choosing the right spark plug for your boat motor isn’t complicated once you know what to look for. I recommend starting with your motor’s specifications, picking a reliable brand, and paying attention to the plug’s features. With the right spark plug, your boat will start easier, run cleaner, and perform better on every trip.
Author Profile
-
Kevin Henry is the voice behind clubisabella.com, where real-world experience meets honest product insight. With a background shaped by years in hospitality and hands-on work with everyday tools, Kevin developed a natural instinct for what makes a product genuinely useful. He has always been drawn to how the right equipment can improve comfort, efficiency, and everyday routines, both at work and at home.
In 2025, Kevin shifted that experience into writing, using clubisabella.com as a place to share practical product reviews based on real use, not marketing claims. He tests items in normal, everyday settings and focuses on clarity, value, and usability. His goal is simple – to help readers make confident buying decisions through straightforward, experience-driven advice.
Latest entries
- December 13, 2025Personal RecommendationsI Tested Insulated Curtains for Sliding Glass Doors: Here’s What Really Worked
- December 13, 2025Personal RecommendationsI Tested the Patient Transfer Lift Chair: My Honest Experience and Review
- December 13, 2025Personal RecommendationsI Tested French Windows Security Locks: Here’s What Really Works to Keep My Home Safe
- December 13, 2025Personal RecommendationsI Tested Aquarium Gravel 25 Lbs: The Ultimate Guide to Choosing the Best Substrate for Your Fish Tank