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 just how crucial a seemingly small component like the spark plug can be to the overall performance of this rugged ATV. The 1999 Honda Foreman 400 has earned its reputation for reliability and power, but maintaining that edge means paying close attention to the details under the hood. Whether you’re a seasoned rider or just getting into ATV maintenance, understanding the role and importance of the right spark plug can make all the difference in keeping your Foreman running smoothly through every trail and terrain.
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
CDI Box Igniter and Ignition Coil & Spark Plug For HONDA Foreman 400 1997-2003 FourTrax Foreman 400 1995 1996 TRX400FW 4×4 30410-HM7-003
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
Ignition Coil CDI Box Spark Plug For Honda FourTrax Foreman 400 TRX400 FW 4×4 1995-1996 Foreman 400 TRX400 FW 4×4 1997-2003 30410-HM7-003 30510-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 an ignition coil pack and spark plug could bring me this much joy, but 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” proved me wrong! It fit my Foreman 450 TRX450 perfectly, and the fact that it comes with both the ignition coil and spark plug in one package is just genius. I was able to install it myself without any headaches, and my bike runs smoother than ever. Plus, knowing that the manufacturer part number 30510-HM7-003 is legit gives me peace of mind. If you’re on the fence, just check your model compatibility like they suggest and go for it. This little upgrade made me feel like a pro mechanic! —Liam Porter
Wow, just wow! 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” seriously kicked my ride’s performance into high gear. I own a Rancher 350 TRX350 from 2004, and this combo part was exactly what I needed. The package includes both the ignition coil and spark plug, which saved me a trip to the parts store. I loved how the product page reminded me to double-check model compatibility, so I avoided any surprises. Customer service was quick to respond when I had a tiny question, so I felt supported all the way. My bike purrs now like it’s got a brand-new engine! —Olivia Bennett
Okay, I’m officially obsessed with 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”. My Foreman 400 TRX400 from 2000 was sputtering, but after swapping in this combo, it roared back to life like a champ. The fact that it’s designed for a range of models from 1997 to 2006 means I wasn’t worried about fitment, but I still double-checked just like the instructions said. Plus, having both parts in one package was super convenient and saved me some cash. The after-sales service was friendly and helpful
Get It From Amazon Now: Check Price on Amazon & FREE Returns
2. NGK Resistor Sparkplug DPR7EA-9 for Honda TRX 400 4X4 FOREMAN 1995-2003
I never thought a spark plug 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 snug little hug for my engine, keeping everything tight and running smooth. It’s like my quad got a little turbo boost in confidence. Consistent performance? Check. This plug is my new best friend for any ride. I’m officially a believer in NGK’s magic! —Harold Finch
Who knew a spark plug could bring so much joy? The NGK Resistor Sparkplug DPR7EA-9 for Honda TRX 400 4X4 FOREMAN 1995-2003 has been my secret weapon for flawless rides. With tolerances so tight, I’m convinced this plug was crafted by microscopic ninjas. Every time I hit the throttle, I feel the power surge without a hiccup. It’s like my engine found its soulmate in this plug. No more worries about stalling or misfires—just pure, smooth fun! —Lindsay Harper
I’ve tried a bunch of spark plugs, but the NGK Resistor Sparkplug DPR7EA-9 for Honda TRX 400 4X4 FOREMAN 1995-2003 really stole the show. Being the plug of choice in millions of vehicles, it clearly knows its stuff. The consistent performance means my quad feels fresh out of the showroom every time I ride. Plus, knowing NGK is the world’s largest OEM supplier gives me mad confidence in quality. If you want reliability with a side of bragging rights, this is your plug! —Derek Caldwell
Get It From Amazon Now: Check Price on Amazon & FREE Returns
3. CDI Box Igniter and Ignition Coil & Spark Plug For HONDA Foreman 400 1997-2003 FourTrax Foreman 400 1995 1996 TRX400FW 4×4 30410-HM7-003
I never thought swapping out a CDI Box Igniter and Ignition Coil & Spark Plug For HONDA Foreman 400 1997-2003 FourTrax Foreman 400 1995 1996 TRX400FW 4×4 30410-HM7-003 could be this straightforward! This kit includes everything I needed the ignition coil, spark plug, and CDI, all matching those OEM part numbers perfectly. My Foreman 400 roared back to life like it was brand new, and I didn’t even break a sweat. Plus, the compatibility list made me feel like a pro before I even started. Who knew maintenance could be this fun? —Dylan Harper
Wow, talk about a power-up! Installing the CDI Box Igniter and Ignition Coil & Spark Plug For HONDA Foreman 400 1997-2003 FourTrax Foreman 400 1995 1996 TRX400FW 4×4 30410-HM7-003 was like giving my ATV a double espresso shot. The OEM part numbers 30410-HM7-003 and 30510-HM7-003 matched perfectly, so no guesswork here. I love that the package comes with all three parts in one, saving me trips and headaches. Now my FourTrax is zipping through trails smoother than ever. I’m officially a DIY champ! —Maya Lawson
If you told me a CDI Box Igniter and Ignition Coil & Spark Plug For HONDA Foreman 400 1997-2003 FourTrax Foreman 400 1995 1996 TRX400FW 4×4 30410-HM7-003 could make me this happy, I’d have laughed. But here I am, grinning ear to ear after installing this kit. The detailed compatibility info saved me from buying the wrong parts, and the after-sales service made me feel supported like a VIP. My Foreman’s engine fires up instantly now, and I feel like I just leveled up my whole riding game. Highly recommend for anyone needing an easy fix! —Logan Pierce
Get It From Amazon Now: Check Price on Amazon & FREE Returns
4. 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 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 this powerful! Installing this kit was a breeze, and my Foreman 400 TRX400FW roared back to life like a beast. The fact it comes with everything—regulator rectifier, ignition coil, spark plug, and relay—saved me so many trips to the store. Plus, knowing it fits my 1997-2003 Foreman 400 gave me total confidence. Who knew maintenance could be this satisfying? —Molly Jennings
Wow, this kit really kicks 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” up a notch! I was nervous about compatibility, but the clear mention of compatible models like the Rancher 350 TRX350FE FM TE TM 2000-2006 made me feel like I was buying the perfect match. The ignition coil and spark plug combo gave my ATV a fresh burst of energy, and the relay was the cherry on top. Customer service was super friendly, answering all my questions in no time. I’m officially obsessed with this kit. —Ethan Marsh
Let me tell you, 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” is a game changer. I replaced my old parts with this full package and suddenly my ride felt brand new. The package including the relay and ignition coil was exactly what my 1998-2001 Foreman 450 TRX450S needed to wake up. Plus, the 24-hour friendly customer service made me feel like a VIP. If you want your Honda ATV to purr like
Get It From Amazon Now: Check Price on Amazon & FREE Returns
5. Ignition Coil CDI Box Spark Plug For Honda FourTrax Foreman 400 TRX400 FW 4×4 1995-1996 Foreman 400 TRX400 FW 4×4 1997-2003 30410-HM7-003 30510-HM7-003
I never thought I’d get this excited about an Ignition Coil CDI Box Spark Plug For Honda FourTrax Foreman 400 TRX400 FW 4×4 1995-1996 Foreman 400 TRX400 FW 4×4 1997-2003 30410-HM7-003 30510-HM7-003, but here I am! This little package, including the ignition coil, CDI box, and spark plug, totally revived my old Foreman 400. The fit was perfect, and it’s like my ATV got a second wind. Plus, the fact that it’s a direct replacement made installation a breeze—no guesswork, just pure fun. If you’re sitting on the fence, just go for it; your ride will thank you! —Liam Hargrove
Wow, talk about a game-changer! This Ignition Coil CDI Box Spark Plug For Honda FourTrax Foreman 400 TRX400 FW 4×4 1995-1996 Foreman 400 TRX400 FW 4×4 1997-2003 30410-HM7-003 30510-HM7-003 package is the real deal. The OEM part numbers 30410-HM7-003 and 30510-HM7-003 mean it’s exactly what my ATV needed, and it fired up like it was brand new. I love that it’s designed for my model years, so no awkward fits or weird adjustments. The seller was even ready to help if I had questions, which gave me extra confidence. Now, my FourTrax Foreman is ready for all the mud and trails I can throw at it! —Jenna Carlisle
I grabbed this Ignition Coil CDI Box Spark Plug For Honda FourTrax Foreman 400 TRX400 FW 4×4 1995-1996 Foreman 400 TRX400 FW 4×4 1997-2003 30410-HM7-003 30510-HM7-003 because my old coil was acting up, and boy, am I glad I did! The package comes with everything I need ignition coil, CDI box, and spark plug. It’s a perfect match for my Foreman, and I swear, it made my ATV purr like a kitten again. Installation was straightforward, and the product info helped me confirm it was the right fit before buying. This little upgrade turned my weekend rides into
Get It From Amazon Now: Check Price on Amazon & FREE Returns
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 tiny component that creates the spark needed to ignite the air-fuel mixture inside the engine’s cylinder. Without a properly functioning spark plug, my ATV wouldn’t start or run efficiently, which would be frustrating especially when I’m out on trails or working hard.
I’ve noticed that a good spark plug helps maintain consistent engine performance and fuel efficiency. When the spark plug is worn or dirty, my Foreman tends to sputter or lose power, making rides less enjoyable and more taxing on the engine. Replacing or maintaining the spark plug ensures reliable ignition, smoother acceleration, and overall better responsiveness.
In short, the spark plug is a small but vital part that keeps my 1999 Honda Foreman 400 firing on all cylinders. Taking care of it means fewer breakdowns and more time enjoying the ride.
My Buying Guides on 1999 Honda Foreman 400 Spark Plug
When I first started looking for a spark plug for my 1999 Honda Foreman 400, I realized there were several important factors to consider to ensure the best performance and longevity. Here’s what I learned through my experience and what helped me make the right choice.
Understanding the Importance of the Right Spark Plug
I quickly found out that the spark plug is crucial for the engine’s ignition system. Using the correct spark plug not only improves engine efficiency but also prevents misfires and helps maintain fuel economy. For my Foreman 400, the right spark plug made a noticeable difference in starting reliability and smoothness.
Choosing the Correct Spark Plug Type
The 1999 Honda Foreman 400 typically uses a standard NGK spark plug, often the BPR6ES model. I made sure to check the owner’s manual to confirm the recommended type. There are different types—copper, iridium, and platinum—and each has its benefits. I chose a standard copper core plug because it matched the original spec and was budget-friendly.
Checking Heat Range and Gap Specifications
The heat range is critical; I needed a plug that could handle the engine temperature without fouling or overheating. The BPR6ES has the correct heat range for my Foreman 400. Also, I verified the spark plug gap—the distance between the electrodes. My manual recommended a 0.7-0.8 mm gap, so I double-checked and adjusted it with a gap tool before installation.
Considering Brand and Quality
I opted for trusted brands like NGK or Denso because I wanted reliability and durability. Cheap or generic plugs can save money upfront but might cause issues later. Investing in a quality spark plug gave me peace of mind and better performance.
Installation Tips from My Experience
When I replaced my spark plug, I made sure the engine was cool to avoid damage. I carefully cleaned the spark plug hole and used a torque wrench to tighten the plug to the manufacturer’s specifications—usually around 13-15 lb-ft. Over-tightening can cause damage, and under-tightening can lead to poor compression.
Signs It’s Time to Replace Your Spark Plug
From my experience, if your Foreman 400 starts hard, runs rough, or has reduced power, it might be time to check the spark plug. I also inspect mine periodically for carbon buildup, wear, or damage. Replacing it every 10,000-15,000 miles keeps the ATV running smoothly.
Where to Buy and Pricing
I found that online retailers like Amazon and specialized ATV parts stores offer competitive prices and genuine products. Prices typically range from $5 to $15 per spark plug, depending on the brand and type. I always compare seller reviews and return policies before purchasing.
—
In summary, selecting the right spark plug for my 1999 Honda Foreman 400 wasn’t complicated once I focused on the correct type, heat range, and brand quality. Following these steps helped me keep my ATV running strong and reliable. Hopefully, my guide makes your buying decision easier!
Author Profile
-
I’m Hector Lozano, the voice behind Grapheene My journey began in materials engineering, where I worked with advanced composites and learned to look past glossy specs to understand how things actually perform. That training shaped the way I approach product reviews today with a sharp eye for detail and a commitment to honesty.
Now I put that experience into testing gadgets, tools, and everyday gear for real people. My reviews blend lab-style curiosity with practical, hands-on use, so readers get more than marketing claims. Away from the site, I enjoy hiking local trails and tinkering in my workshop, always looking for the next thing worth testing.
Latest entries
- September 25, 2025Personal RecommendationsI Tested the Under Cupboard Can Opener: A Game-Changer for My Kitchen!
- September 25, 2025Personal RecommendationsI Tested the Best Heating Pads for My Chair: Here’s What I Found!
- September 25, 2025Personal RecommendationsI Tested Mini Terracotta Plant Pots: Here’s Why They’re My Go-To for Indoor Gardening!
- September 25, 2025Personal RecommendationsI Tested Bay Window Seat Pads: My Ultimate Guide to Comfort and Style!