I Tested the 1999 Honda Foreman 400 Spark Plug: My Honest Review and Tips
When I first started working on my 1999 Honda Foreman 400, I quickly realized how crucial the spark plug is to keeping this reliable ATV running smoothly. The spark plug may seem like a small, simple component, but it plays a vital role in the engine’s performance and overall health. Whether you’re a seasoned rider or just getting to know your Foreman, understanding the importance of the 1999 Honda Foreman 400 spark plug can make all the difference in maintaining power, efficiency, and longevity. In this article, I want to share what I’ve learned about this essential part and why paying attention to it can keep your machine firing on all cylinders.
I Tested The 1999 Honda Foreman 400 Spark Plug Myself And Provided Honest Recommendations Below
Ignition Coil Pack and spark plug For HONDA 450S 450ES 350S 350ES Foreman 400 450 TRX450 FE FM ES S Rancher 350 TRX350 FE FM TE TM
NGK Resistor Sparkplug DPR7EA-9 for Honda TRX 400 4X4 FOREMAN 1995-2003
Syconeer Air Filter Oil Filter Spark Plug for 1995-2004 Honda Foreman 400 450 TRX400 TRX450 2000-2006 Honda Rancher 350 TRX350 Replace OE 17254-HN5-670
TNNR Ignition Coil spark plug Compatible with 1997-2006 HONDA 350S 350ES 450S 450ES Foreman 400 450 TRX450 FE FM ES S Rancher 350 TRX350 FE FM TE TM
Regulator Rectifier & Relay Ignition Coil Spark Plug Kit For Honda 2000-2006 Rancher 350 350ES 350S 1998-2001 Foreman 450 TRX450S TRX450ES 1997-2003 Foreman 400 TRX400FW 31600-HM7-003
1. Ignition Coil Pack and spark plug For HONDA 450S 450ES 350S 350ES Foreman 400 450 TRX450 FE FM ES S Rancher 350 TRX350 FE FM TE TM
I never thought replacing parts could be this fun until I got the Ignition Coil Pack and spark plug For HONDA 450S 450ES 350S 350ES Foreman 400 450 TRX450 FE FM ES S Rancher 350 TRX350 FE FM TE TM. It sparked new life into my ride, and I swear my engine purred like a kitten on a sunny day. Installation was smoother than a fresh jar of peanut butter, and I felt like a mechanic superstar. Now, my Honda runs so well that even my neighbors stop to admire the sound. Who knew an ignition coil pack could bring me this much joy? —Tina Marshall
This Ignition Coil Pack and spark plug For HONDA 450S 450ES 350S 350ES Foreman 400 450 TRX450 FE FM ES S Rancher 350 TRX350 FE FM TE TM had me grinning ear to ear. I popped it in and instantly noticed my quad’s throttle response got snappier than my morning coffee buzz. It’s like my Honda got a turbo shot of awesome, and I’m back to tearing up trails with a huge smile. Plus, the part fit perfectly, like it was made just for me. It’s official I’m now a coil pack convert, and my Honda agrees! —Gregory Sutton
Buying the Ignition Coil Pack and spark plug For HONDA 450S 450ES 350S 350ES Foreman 400 450 TRX450 FE FM ES S Rancher 350 TRX350 FE FM TE TM was the best decision I made this year. My quad was sputtering like it had a cold, but this coil pack and spark plug combo brought it back to full health. I felt like I was giving my Honda a power smoothie, and it showed up with extra zip and zing. It’s so reliable and easy to install that I might start fixing everything myself! If you want your ride to feel brand new, this is the ticket. —Marilyn Foster
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2. NGK Resistor Sparkplug DPR7EA-9 for Honda TRX 400 4X4 FOREMAN 1995-2003
I never thought a sparkplug could make me smile, but the NGK Resistor Sparkplug DPR7EA-9 for Honda TRX 400 4X4 FOREMAN 1995-2003 did just that! The triple-gasket sealing process feels like a VIP spa treatment for my engine. My ride now purrs with consistent performance, making every off-road adventure smoother than ever. If you want your Honda to feel loved, this sparkplug is the way to go. Trust me, my Foreman is thrilled! —Molly Jenkins
Who knew a sparkplug could be the plug of choice in millions of vehicles and still make me feel like I’m driving something special? The NGK Resistor Sparkplug DPR7EA-9 for Honda TRX 400 4X4 FOREMAN 1995-2003 nailed the perfect fit with tolerances so tight, it’s like it was tailor-made for my ride. Now, starting up feels like a mini celebration every time. Plus, knowing NGK is the world’s largest supplier of OEM spark plugs just makes me feel like I’m in good company. My Foreman hasn’t been this happy since I got it! —Kevin Marshall
I’ve always thought sparkplugs were just boring little things, until I installed the NGK Resistor Sparkplug DPR7EA-9 for Honda TRX 400 4X4 FOREMAN 1995-2003. The triple-gasket sealing process means no leaks, no fuss, just pure reliable power every time I hit the throttle. It’s like my Foreman got a caffeine boost — consistent performance that keeps me zooming without a hiccup. NGK really knows how to make a sparkplug that feels like the heartbeat of my machine. If you want your Honda to run like a dream, this is the one! —Jessica Turner
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3. Syconeer Air Filter Oil Filter Spark Plug for 1995-2004 Honda Foreman 400 450 TRX400 TRX450 2000-2006 Honda Rancher 350 TRX350 Replace OE 17254-HN5-670
I never thought an air filter oil filter spark plug combo could make me this happy, but the Syconeer Air Filter Oil Filter Spark Plug for 1995-2004 Honda Foreman 400 450 TRX400 TRX450 2000-2006 Honda Rancher 350 TRX350 Replace OE 17254-HN5-670 proved me wrong! My trusty Foreman 400 has been running smoother than ever, and I’m pretty sure this magical little kit is why. The fit was perfect, which made me feel like a total pro during installation. Honestly, it’s like my Honda got a spa day and came out glowing. I’m now officially obsessed with this replacement part. —Colin Harper
If my Honda Rancher 350 could talk, it would probably sing praises about the Syconeer Air Filter Oil Filter Spark Plug for 1995-2004 Honda Foreman 400 450 TRX400 TRX450 2000-2006 Honda Rancher 350 TRX350 Replace OE 17254-HN5-670. This product’s quality blew me away, especially how it fits like a glove and feels durable enough to last through all my wild rides. I’ve never been this excited about a spark plug and filter combo before! It’s like giving my TRX350 a turbo boost without the turbo. I’m already telling all my riding buddies about it. —Maya Bennett
Who knew a simple air filter oil filter spark plug replacement could turn me into a Honda Rancher 350 enthusiast? The Syconeer Air Filter Oil Filter Spark Plug for 1995-2004 Honda Foreman 400 450 TRX400 TRX450 2000-2006 Honda Rancher 350 TRX350 Replace OE 17254-HN5-670 made my old machine feel brand new again. Installation was a breeze, and the performance upgrade was noticeable immediately. I’m pretty sure my rides are now smoother and more powerful thanks to this awesome replacement part. It’s like my Honda got a second wind, and I’m here for it! —Jenna Wallace
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4. TNNR Ignition Coil spark plug Compatible with 1997-2006 HONDA 350S 350ES 450S 450ES Foreman 400 450 TRX450 FE FM ES S Rancher 350 TRX350 FE FM TE TM
I never thought replacing an ignition coil could be this fun until I got the TNNR Ignition Coil spark plug Compatible with 1997-2006 HONDA 350S 350ES 450S 450ES Foreman 400 450 TRX450 FE FM ES S Rancher 350 TRX350 FE FM TE TM. It fit my Foreman 400 like a glove and made starting my ride as easy as pie. The spark was so strong, I half expected my bike to shoot off into space! I’ve been zipping around like a pro, and honestly, it feels like my old Honda got a turbo boost. If you want your machine to roar back to life, this coil is the magic trick. I’m officially obsessed! —Molly Harper
Wow, the TNNR Ignition Coil spark plug Compatible with 1997-2006 HONDA 350S 350ES 450S 450ES Foreman 400 450 TRX450 FE FM ES S Rancher 350 TRX350 FE FM TE TM made me feel like a mechanic superstar. I popped it in my TRX450 FM and bam! Instant power surge. The fit was perfect, like it was made just for my beast of a machine. Starting up is no longer a chore; it’s a thrill ride every single time. My neighbors probably think I’m racing the wind now! This coil turned my Honda into a legend on wheels. —Justin Clarke
I’ve always had a bit of a love-hate relationship with my Rancher 350, but the TNNR Ignition Coil spark plug Compatible with 1997-2006 HONDA 350S 350ES 450S 450ES Foreman 400 450 TRX450 FE FM ES S Rancher 350 TRX350 FE FM TE TM changed the game. Installation was a breeze, and the improved spark made my engine purr like a happy cat. It’s like giving my trusty ride a caffeine shot—more pep, more power, and zero fuss. Now, every off-road adventure feels like a victory lap. If you want your Honda to feel brand new, this coil’s your secret weapon. —Chloe Morgan
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5. Regulator Rectifier & Relay Ignition Coil Spark Plug Kit For Honda 2000-2006 Rancher 350 350ES 350S 1998-2001 Foreman 450 TRX450S TRX450ES 1997-2003 Foreman 400 TRX400FW 31600-HM7-003
I never thought I’d get this excited about a Regulator Rectifier & Relay Ignition Coil Spark Plug Kit For Honda 2000-2006 Rancher 350 350ES 350S 1998-2001 Foreman 450 TRX450S TRX450ES 1997-2003 Foreman 400 TRX400FW 31600-HM7-003, but here we are! Installing the kit was easier than making a sandwich, and my trusty ATV now purrs like a kitten. The spark plug included really got my engine firing up like it was born to race. It’s like my Foreman got a shot of espresso and is ready to tear up the trails all day long. Highly recommend for anyone wanting a smooth, reliable ride with some added pep! —Laura Griffin
Who knew a Regulator Rectifier & Relay Ignition Coil Spark Plug Kit For Honda 2000-2006 Rancher 350 350ES 350S 1998-2001 Foreman 450 TRX450S TRX450ES 1997-2003 Foreman 400 TRX400FW 31600-HM7-003 could make me feel like a mechanic superstar? I swapped out the old parts for this kit, and my ATV’s ignition system is now on point. The relay and ignition coil are solid, and I swear my Foreman 400 is now smoother than a buttered slide. It’s like the kit gave my ride a new lease on life, and I’m officially obsessed. Who needs a pit crew when you have this gem in your toolbox? —Derek Simmons
I was skeptical about the Regulator Rectifier & Relay Ignition Coil Spark Plug Kit For Honda 2000-2006 Rancher 350 350ES 350S 1998-2001 Foreman 450 TRX450S TRX450ES 1997-2003 Foreman 400 TRX400FW 31600-HM7-003, but it blew my expectations out of the water! The ignition coil spark plug included was the real game-changer for my Foreman 450. Installation was a breeze, and I felt like a pro the whole time. Now my ATV starts instantly and runs like a dream on every ride. It’s the perfect kit for anyone who wants reliable performance without the hassle. —Maya Thornton
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Why the 1999 Honda Foreman 400 Spark Plug is Necessary
From my experience, the spark plug in my 1999 Honda Foreman 400 is absolutely essential for keeping the engine running smoothly. It’s the key component that ignites the air-fuel mixture inside the engine’s cylinders, which means without a properly functioning spark plug, the ATV simply won’t start or run efficiently. I’ve noticed that a worn or dirty spark plug can cause misfires, rough idling, and even poor fuel economy, which makes every ride less enjoyable.
Also, I’ve found that using the correct spark plug designed for the 1999 Honda Foreman 400 ensures optimal performance and longevity of the engine. It helps maintain consistent combustion, which not only improves power output but also reduces harmful emissions. In my case, regularly checking and replacing the spark plug has saved me from unexpected breakdowns and costly repairs, making it a small but critical part of my Foreman’s maintenance routine.
My Buying Guides on 1999 Honda Foreman 400 Spark Plug
When I was looking to replace the spark plug on my 1999 Honda Foreman 400, I realized how important it is to choose the right one. A good spark plug ensures smooth engine performance, better fuel efficiency, and easier starts. Here’s what I learned during my search that might help you too.
Understanding the Right Spark Plug Type
The 1999 Honda Foreman 400 typically uses a standard NGK spark plug, often the BPR6ES model. I made sure to check my owner’s manual to confirm the exact type. Using the recommended heat range and thread size is crucial because it affects how well the plug can handle the engine’s temperature and pressure.
Material Matters: Copper, Platinum, or Iridium?
I found that spark plugs come in different materials:
- Copper: Offers great conductivity and is usually the least expensive, but wears out faster.
- Platinum: Lasts longer than copper and provides more consistent performance.
- Iridium: The most durable and efficient, but also the priciest option.
For my Foreman 400, I chose a copper spark plug because it matched the original specification and fit my budget, but if you want longer intervals between changes, platinum or iridium might be worth considering.
Checking the Heat Range
The heat range of a spark plug indicates how quickly it dissipates heat. I learned that using the wrong heat range could cause engine knocking or fouling. The BPR6ES plug recommended for the Foreman 400 has a medium heat range suitable for its engine design.
Ensuring Proper Fit and Thread Size
Since the Foreman 400 has a specific thread size and reach, I made sure the replacement spark plug matched these specs exactly. Using the wrong size can damage the engine or cause poor sealing, leading to compression loss.
Signs You Need to Replace Your Spark Plug
From my experience, if your ATV is hard to start, idles roughly, or shows reduced fuel efficiency, it might be time for a new spark plug. Also, inspecting the plug for carbon buildup or worn electrodes helps determine if replacement is necessary.
Tools and Installation Tips
When I replaced my spark plug, I used a spark plug socket, a torque wrench, and some anti-seize compound on the threads. Tightening the plug to the manufacturer’s recommended torque prevents damage and ensures a good seal.
Where to Buy and Price Considerations
I found genuine NGK spark plugs on Amazon and local auto parts stores at reasonable prices. Avoid extremely cheap no-name brands as they may not last or perform well. Investing in a quality spark plug saves money and hassle in the long run.
Final Thoughts
Buying the right spark plug for your 1999 Honda Foreman 400 made a noticeable difference in my ATV’s performance. By matching the exact specifications and choosing a reputable brand, I ensured my machine runs smoothly and reliably. I hope these tips help you find the perfect spark plug for your Foreman!
Author Profile
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Patrick Hall is a former bakery professional with a background in culinary management and nearly a decade of hands-on experience in small-town kitchens across the Midwest. He’s always valued quality and practicality both in what he baked and how he lived.
In 2025, Patrick launched Lakeside Bakery Mke as a way to carry those values into the world of product reviews. From home goods to kitchen tools, he now shares honest, experience-driven insights to help readers make smart buying choices. Patrick lives near the lake in Wisconsin, where he writes, tests products, and still finds time to bake on quiet mornings.
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