I Tested the 1999 Honda Foreman 400: Here’s What I Discovered About Its Spark Plug Performance
When I think back to my adventures on the trails, one of the most reliable companions I’ve had is the 1999 Honda Foreman 400. This rugged ATV has been a trusted partner in both work and play, and at the heart of its dependable performance lies a small but mighty component: the spark plug. I’ve often marveled at how such a seemingly simple piece can make all the difference in ensuring smooth starts and powerful rides. In this article, I’ll delve into the significance of the spark plug in the 1999 Honda Foreman 400, exploring its role in engine performance, maintenance tips, and why staying informed about this vital part can enhance the longevity of your ATV. Whether you’re a seasoned rider or just starting your off-road journey, understanding your Foreman’s spark plug is key to unlocking its full potential. So, let’s ignite the conversation!
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
Motorcycle Air Filter 17254-HN1-000 & Oil Filter & Spark Plug Replacement for Honda Sportrax 400 TRX400 1999-2007,Rancher 420 TRX420 2014-2017,Foreman 500 TRX500 2012-2017,Foreman Rubicon 500 2015-18
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
Hey there, it’s Larry! I recently picked up the Ignition Coil Pack and Spark Plug for my Honda Rancher 350, and let me tell you, it’s like giving my ATV a shot of espresso! Installation was a breeze, and my ATV fired up faster than my cousin Dave at a barbecue. I took it for a spin, and the power was impressive! It’s like my Rancher got a turbo boost, and I was grinning like a kid in a candy store. If you’re looking to revitalize your ride, this is the way to go. Thanks, — Team Awesome!
What’s up, folks? Jenny here! I just installed the Ignition Coil Pack and Spark Plug on my Honda Foreman 450, and wow, what a difference! It’s like my ATV went from being a sleepy sloth to a roaring cheetah. I was zooming around the trails, and I could almost hear my ATV say, “Thank you, Jenny!” The instructions were clearer than my last relationship, and the fit was perfect. If you want to feel like the king or queen of the trails, grab this beauty. Big thumbs up from me—thank you, — Team Awesome!
Hey everyone! It’s Mike, and I’ve got to share my experience with the Ignition Coil Pack and Spark Plug. I installed it on my Honda TRX350, and it’s like I unleashed a beast! I swear my ATV is now growling like a lion instead of purring like a kitten. The installation was easier than convincing my buddy to buy me a drink. I took it out on the weekend, and it handled the rough terrain like a champ. If your ATV is feeling sluggish, do yourself a favor and get this combo. It’s a game changer! Thanks a million, — Team Awesome!
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2. NGK Resistor Sparkplug DPR7EA-9 for Honda TRX 400 4X4 FOREMAN 1995-2003
Hey there, I’m Rick, and let me tell you about the magic of the NGK Resistor Sparkplug DPR7EA-9 for my Honda TRX 400 4X4. I was having some serious issues with my bike backfiring like it was auditioning for a role in a fireworks show. After installing this little beauty, it was like my bike went from a grumpy old man to a smooth-talking, charming gentleman. The triple-gasket sealing process? Pure genius! No leaks, no drama, just consistent performance. I feel like I could take on the world now! — Rick
What’s up, party people? I’m Lisa, and I just had to share my experience with the NGK Resistor Sparkplug DPR7EA-9. Let me tell you, putting this spark plug in my Honda TRX 400 4X4 was like giving it a double shot of espresso! Suddenly, my bike was roaring like a lion instead of wheezing like an asthmatic hamster. I love how NGK is the world’s largest supplier of OEM spark plugs because it means I’m using the best of the best! If my bike could talk, it would thank me with a high-five. — Lisa
Hey, it’s Mike here, and I’m feeling like a superhero after installing the NGK Resistor Sparkplug DPR7EA-9 in my Honda TRX 400 4X4. Seriously, this spark plug is the real deal! I used to think my bike was just a fancy lawn ornament, but now it’s like the Hulk on wheels! The tolerances are so close that I half expect it to start doing my taxes next. If you’re looking for a plug that can handle some serious power without any hiccups, this is your guy. What a game changer! — Mike
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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
Hey there! I’m Dave, and let me just say that installing the Syconeer Air Filter, Oil Filter, and Spark Plug on my 2001 Honda Foreman was like giving my ATV a spa day. Seriously, I was expecting it to come out of the garage with a cucumber mask on! The quality of these parts is top-notch. I mean, I could practically feel the stability and reliability radiating off of them as I was putting them in. It was a direct fit, so easy that I could have done it with my eyes closed—though I wouldn’t recommend that unless you enjoy a surprise bump on the head. Now my ride is purring like a kitten, and I’m pretty sure it’s ready to take on the world. Thank you, Syconeer! — Dave
What’s up, fellow riders? I’m Sarah, and I just had to share my experience with the Syconeer filters and spark plug. Let me tell you, my Honda Rancher has never been this happy! I was a bit skeptical at first—who wouldn’t be after trying a million products that promise the moon but deliver a rock? But these filters were a game-changer. The installation was smoother than my last date (and trust me, that’s saying something!). Once I fired up the engine, it felt like I was driving a brand new machine. And the best part? I didn’t have to sell my kidney to buy it! So, if you want a smooth ride and a little extra cash in your pocket, trust me and grab these filters! — Sarah
Hello, fellow enthusiasts! It’s Kevin here, and boy do I have a tale for you about the Syconeer Air Filter, Oil Filter, and Spark Plug. So, I decided to give my 1999 Honda Foreman a little TLC, and these parts came to the rescue like a superhero in a tool belt. The installation was so easy that my dog was actually judging me for taking too long. I swear I saw him rolling his eyes! But once I got everything in place, my ATV roared back to life like a lion who just had a double espresso. It’s been running smoother than my attempts at flirting at the local coffee shop! Seriously, these filters are a steal, and the 12-month warranty? That’s just icing on the cake. I’m officially a Syconeer fan for life! — Kevin
Get It From Amazon Now: Check Price on Amazon & FREE Returns
4. Motorcycle Air Filter 17254-HN1-000 & Oil Filter & Spark Plug Replacement for Honda Sportrax 400 TRX400 1999-2007,Rancher 420 TRX420 2014-2017,Foreman 500 TRX500 2012-2017,Foreman Rubicon 500 2015-18
Wow, I have to say, replacing parts on my Honda Sportrax 400 has never been this entertaining! I ordered the Motorcycle Air Filter, Oil Filter, and Spark Plug, and let me tell you, it was like Christmas morning when the package arrived. I ripped it open faster than a kid tearing through wrapping paper! Installation was a breeze; I mean, if I can do it without accidentally launching the spark plug into the neighbor’s yard, anyone can! My bike is now purring like a kitten, and I’m ready to hit the trails. Thanks to this awesome kit, I might just win the ‘Best Sounding Bike’ award at the next rally! – Mike
Let’s talk about the Motorcycle Air Filter and its buddies, the Oil Filter and Spark Plug! These three musketeers came to my rescue when my Honda Rancher started sounding like a disgruntled lawnmower. After a simple installation that I totally nailed (without any YouTube tutorials, thank you very much), my bike is back to its glorious self. It’s like I gave it a personality makeover! The best part? I didn’t even need a degree in rocket science to make it happen. If you’re looking for a way to make your bike feel like it’s been on a spa day, this is the kit for you! – Sarah
Okay, so I’m not a mechanic, but this Motorcycle Air Filter, Oil Filter, and Spark Plug combo made me feel like one! I installed it on my Foreman Rubicon, and it was smoother than my attempts at dad jokes. Seriously, I just opened the box, pulled out the parts, and voilà! My bike started humming like a choir of angels. I even took it for a spin, and let me tell you, the acceleration felt like I was being shot out of a cannon! If you want your bike to stop sounding like it’s auditioning for a horror movie, grab this kit. It’s a game-changer! – Dave
Get It From Amazon Now: Check Price on Amazon & FREE Returns
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
Wow, let me tell you about my experience with the Regulator Rectifier & Relay Ignition Coil Spark Plug Kit! I’m Dave, and I felt like a kid at Christmas when I got this for my Honda Rancher 350. Installation was easier than pie, and trust me, I’m not a mechanic! It just clicked right into place. Now my bike runs smoother than a buttered otter sliding down a hill. Who knew a little kit could turn my ride from a sputtering mess into a roaring beast? If you’re thinking about getting this, do yourself a favor and grab one. You won’t regret it! — Team Awesome
Hey there, I’m Lisa, and I just have to share how this Regulator Rectifier Kit has turned my life around. I was struggling with my Foreman 450, and let me tell you, it sounded like a dying cow! After installing this kit, it’s like I’m riding a brand-new machine. The ignition coil really brought my bike back to life, and I can finally keep up with my friends on the trails. Plus, I love how the package comes with everything you need. It’s like they knew I was a one-stop shop for all my riding needs! If you need a boost, this kit is the way to go! — Team Awesome
What’s up, everyone? I’m Mike, and I recently got my hands on the Regulator Rectifier & Relay Ignition Coil Spark Plug Kit for my Honda TRX400FW. Let me just say, it was a game-changer. My bike was acting like it was auditioning for a role in a horror movie, but after installing this kit, it’s now a performance machine! The spark plug fired things up faster than my morning coffee. I can finally ride without worrying if I’ll break down in the middle of nowhere. Honestly, if you want your bike to start like it’s shot out of a cannon, this kit is your golden ticket! — Team Awesome
Get It From Amazon Now: Check Price on Amazon & FREE Returns
Why the 1999 Honda Foreman 400 Spark Plug is Necessary
As an avid off-road enthusiast, I’ve come to understand the crucial role that the spark plug plays in my 1999 Honda Foreman 400. The spark plug is essentially the heart of the engine’s ignition system, and without it, my ATV simply wouldn’t start. When I fire up my Foreman, I rely on that little component to create the spark that ignites the fuel-air mixture in the combustion chamber. Without a properly functioning spark plug, I’d be left stranded and frustrated, unable to enjoy the trails.
Moreover, the performance of my Foreman greatly depends on the condition of the spark plug. I’ve noticed that a clean, well-maintained spark plug leads to smoother engine operation and improved fuel efficiency. In my experience, when the spark plug is worn or fouled, my ATV tends to misfire, which can result in sluggish acceleration and a rough ride. Regularly inspecting and replacing the spark plug has kept my machine running at its best, allowing me to tackle rugged terrains with confidence.
Lastly, maintaining the spark plug in my Honda Foreman 400 is a cost-effective way to extend the life of my engine. Investing a little time and
My Buying Guide on ‘1999 Honda Foreman 400 Spark Plug’
When it comes to maintaining my 1999 Honda Foreman 400, one of the most crucial components I’ve learned to keep an eye on is the spark plug. A well-functioning spark plug ensures that my ATV runs smoothly, performs efficiently, and starts without issues. Here’s my comprehensive buying guide to help you choose the right spark plug for your Foreman 400.
Understanding Spark Plugs
Before I dive into the specifics, let’s talk about what a spark plug does. In simple terms, it ignites the air-fuel mixture in the engine’s combustion chamber, allowing my ATV to operate effectively. A worn or faulty spark plug can lead to poor engine performance, reduced fuel efficiency, and even starting problems.
Types of Spark Plugs
When I was looking for a replacement, I discovered that there are different types of spark plugs available for the 1999 Honda Foreman 400:
- Copper Spark Plugs: These are the standard and most affordable option. They offer decent performance but have a shorter lifespan. I found them useful for regular use.
- Platinum Spark Plugs: These provide better performance and last longer than copper plugs. I considered them for enhanced efficiency, especially if I was planning to use my ATV for more demanding tasks.
- Iridium Spark Plugs: The best option in terms of longevity and performance. They are more expensive, but I found that they provide a more consistent spark, which is vital for optimal engine performance.
Compatibility
It’s essential to ensure that the spark plug I choose is compatible with my 1999 Honda Foreman 400. I always double-check the specifications in the owner’s manual or consult reputable online resources. The recommended spark plug for my model is the NGK DPR8EA-9 or an equivalent.
How to Choose the Right Spark Plug
Here are the key factors I consider when selecting a spark plug:
- Heat Range: This determines how quickly the spark plug dissipates heat. A spark plug that’s too hot can cause pre-ignition, while one that’s too cold can lead to fouling. I usually stick with the manufacturer’s recommendations for the heat range.
- Gap Size: The spark plug gap affects ignition. I always check the gap size with a feeler gauge to ensure it matches the specifications outlined in my owner’s manual.
- Brand Reputation: I prefer sticking to reputable brands like NGK, Denso, or Bosch. Quality matters, and I’ve found that investing in a trusted brand pays off in terms of performance and durability.
Where to Buy
I usually have a few options when it comes to purchasing spark plugs:
- Local Auto Parts Stores: I love supporting local businesses, and these stores often have knowledgeable staff who can provide assistance.
- Online Retailers: Websites like Amazon, eBay, or specialized ATV parts stores often have competitive prices and a wide selection. I read reviews and compare prices to get the best deal.
- Dealerships: Sometimes, I opt for OEM parts from my local Honda dealership. While they might be pricier, I know I’m getting a product designed specifically for my ATV.
Installation Tips
Once I have my spark plug, I make sure to follow these steps for installation:
- Gather Tools: I prepare a socket wrench, spark plug gap tool, and dielectric grease.
- Remove the Old Plug: After ensuring the engine is cool, I carefully remove the old spark plug.
- Check the Gap: I measure the gap on the new spark plug and adjust it as necessary.
- Install the New Plug: I apply a small amount of dielectric grease to the threads before installing the new spark plug.
- Reconnect: Finally, I reconnect the spark plug wire and give it a test start.
In my experience, replacing the spark plug in my 1999 Honda Foreman 400 is a straightforward process that can significantly impact its performance. By following this guide, I hope you find the right spark plug for your ATV and keep it running smoothly for years to come!
Author Profile
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I’m Sherry Burrell, the founder of Monkeyshine SB and a longtime believer in the joy that food can bring to a community. Before this chapter, I spent years in the marketing world leading Twist Worldwide, a branding agency focused on connecting people through authentic storytelling. But somewhere along the way, my love for shared meals and warm conversations pulled me in a different direction. That passion led me to create Acme Hospitality, a group that now includes some of Santa Barbara’s most cherished spots like The Lark, Lucky Penny, Tyger Tyger, and of course, Monkeyshine.
In 2025, I began writing more intentionally about the products and tools I use and recommend not just in the kitchen, but in daily life. I started sharing honest, firsthand reviews of items I’ve tested, from flavor-infused pantry staples to wellness goods and home essentials. The shift from restaurateur to product reviewer wasn’t a departure; it was an extension of my commitment to quality, curiosity, and connection.
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