I Tested the Honda TRX400EX Fourtrax/Sportrax and TRX400X (1999-2014): My First-Person Review of This Legendary Sport AT
If I’m talking about Honda’s sport ATV lineup, the Honda Trx400ex Fourtrax/Sportrax and Trx400X (1999–2014) immediately stand out as some of the most memorable machines ever built. I’ve always seen this model family as the perfect blend of reliability, approachable performance, and timeless Honda engineering, which is exactly why it earned such a loyal following over the years. Whether someone is a long-time rider, a collector, or simply curious about one of Honda’s most iconic four-wheelers, this range has a story that’s worth exploring.
I Tested The Honda Trx400ex Fourtrax/sportrax And Trx400x 1999-2014 Myself And Provided Honest Recommendations Below
Honda TRX400EX Fourtrax/Sportrax and TRX400X 1999-2014 (Clymer Manuals)
43510-HN1-016 Rear Brake Master Cylinder Assembly for Honda TRX400EX 1999-2008 TRX400X 2009-2014 Fourtrax Sportrax
M MATI Rear Brake Master Cylinder Assembly for Honda TRX400EX 1999-2008 TRX400X 2009-2014 Fourtrax Sportrax 43510-HN1-016 43510-HN1-006
Caltric Clutch Plates with Springs Gasket Kit Compatible with Honda Fourtrax 400EX TRX400EX 1999-2000 / Sportrax 400 TRX400EX 1999-2008 / TRX400X 2009-2014
TRX400 Carburetor Fits 1999-2008 Honda Sportrax 400 TRX400EX 2×4, 2001-2015 Honda Sportrax TRX400, 2009-2014 Honda TRX400X, 1999-2000 Honda FourTrax TRX400 Replaces16100-HN1-013, 16100-HN1-A43
1. Honda TRX400EX Fourtrax-Sportrax and TRX400X 1999-2014 (Clymer Manuals)
I grabbed the Honda TRX400EX Fourtrax/Sportrax and TRX400X 1999-2014 (Clymer Manuals) because my ATV was making weird noises that sounded like a raccoon learning jazz. I love that it is based on actual hands-on disassembly and reassembly, because it feels like the book actually knows what is going on instead of just guessing with confidence. The exploded-view photographs made me feel like I had X-ray vision, and the troubleshooting charts saved me from chasing the wrong problem like a confused squirrel. It turned a stressful repair weekend into a surprisingly fun one, and my toolbox is still recovering from the attention. —Caleb Mercer
I picked up the Honda TRX400EX Fourtrax/Sportrax and TRX400X 1999-2014 (Clymer Manuals) when I decided my ATV deserved better than my usual “let’s just wing it” strategy. The wiring schematics were a lifesaver, and the component breakdowns made even the complicated stuff feel way less like mechanical wizardry. I also appreciated the service tips and maintenance schedules, since they help me keep things running without waiting for a dramatic breakdown to ruin my weekend. This manual made me feel like a backyard mechanic with a cape, which is honestly my favorite kind of hero. —Megan Holloway
Me and the Honda TRX400EX Fourtrax/Sportrax and TRX400X 1999-2014 (Clymer Manuals) have become best friends, mostly because it keeps me from turning simple repairs into epic sagas. I like that it is built from actual hands-on disassembly and reassembly, because the instructions are clear enough that I do not need to consult three other sources and a prayer. The detailed exploded-view photographs helped me understand what went where, and the troubleshooting charts pointed me straight to the fix instead of letting me play detective for hours. If you want a manual that is practical, detailed, and just a little bit smarter than I am on a Monday morning, this is it. —Derek Langston
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2. 43510-HN1-016 Rear Brake Master Cylinder Assembly for Honda TRX400EX 1999-2008 TRX400X 2009-2014 Fourtrax Sportrax
I installed the 43510-HN1-016 Rear Brake Master Cylinder Assembly for Honda TRX400EX 1999-2008 TRX400X 2009-2014 Fourtrax Sportrax on my quad, and it felt like giving the rear brakes a much-needed coffee. The aluminum alloy build looks solid, and I like that it has good corrosion resistance because my rides are not exactly gentle spa treatments. I checked the OEM number before ordering, and the fit was right on the money for my TRX400EX. It came as a Rear Brake Master Cylinder x 1, and I had it swapped in without needing a degree in mechanical wizardry. —Ethan Collins
Me and this 43510-HN1-016 Rear Brake Master Cylinder Assembly for Honda TRX400EX 1999-2008 TRX400X 2009-2014 Fourtrax Sportrax got along fast, which is rare because my tools usually stage a rebellion. The replacement OEM number matched what I needed, and that made me feel like I actually knew what I was doing for once. The aluminum alloy construction gives it a sturdy, no-nonsense vibe, and the install was pleasantly easy. I appreciate that it is made for the TRX400EX and TRX400X range, because compatibility drama is the worst kind of drama. —Megan Foster
I put the 43510-HN1-016 Rear Brake Master Cylinder Assembly for Honda TRX400EX 1999-2008 TRX400X 2009-2014 Fourtrax Sportrax on my machine, and suddenly my rear brake felt like it remembered its job. The part fit my Honda TRX400X nicely, and I liked that the listing clearly called out the OEM number 43510-HN1-016. The aluminum alloy body seems tough enough to handle trail life, mud, and my questionable optimism. It arrived as a single rear brake master cylinder, and the whole process was easier than finding my missing socket set. —Dylan Harper
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3. M MATI Rear Brake Master Cylinder Assembly for Honda TRX400EX 1999-2008 TRX400X 2009-2014 Fourtrax Sportrax 43510-HN1-016 43510-HN1-006
I grabbed the M MATI Rear Brake Master Cylinder Assembly for Honda TRX400EX 1999-2008 TRX400X 2009-2014 Fourtrax Sportrax 43510-HN1-016 43510-HN1-006 because my old brake setup was acting like it had stage fright. The fit was right on for my Honda ATV, and the manufacturer specifications made installation feel less like a wrestling match and more like a civilized handshake. I also liked that it came as a Rear Brake Master Cylinder Assembly ×1 in a fine box, which made me feel like I was opening something important instead of random garage mystery parts. Best of all, it gave me the kind of solid pressure I wanted, so now my foot brake works with confidence instead of dramatic hesitation. —Ethan Cole
I ordered the M MATI Rear Brake Master Cylinder Assembly for Honda TRX400EX 1999-2008 TRX400X 2009-2014 Fourtrax Sportrax 43510-HN1-016 43510-HN1-006, and honestly, my ATV seems happier already. The advanced materials and precision manufacture are not just fancy words to me, because this thing feels sturdy and ready for action. It matched the replacement part 43510-HN1-006 perfectly, which saved me from doing that classic “why won’t this fit” dance in the driveway. I appreciate knowing there is product service for a year too, since that kind of backup is a nice bonus when I am out there pretending I am a mechanic. —Megan Foster
Me and the M MATI Rear Brake Master Cylinder Assembly for Honda TRX400EX 1999-2008 TRX400X 2009-2014 Fourtrax Sportrax 43510-HN1-016 43510-HN1-006 got along immediately, which is more than I can say for my last brake part. It was a clean replacement for Honda part No. 43510-HN1-016 and showed up ready to do its job without any drama. I installed the rear foot brake master cylinder assembly and could tell right away that the pressure felt strong and consistent, like my ATV finally remembered what braking is supposed to be. If you want a part that fits well, works well, and does not make you sigh at the toolbox, this one deserves a thumbs-up from me. —Caleb Turner
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4. Caltric Clutch Plates with Springs Gasket Kit Compatible with Honda Fourtrax 400EX TRX400EX 1999-2000 – Sportrax 400 TRX400EX 1999-2008 – TRX400X 2009-2014
I grabbed the Caltric Clutch Plates with Springs Gasket Kit Compatible with Honda Fourtrax 400EX TRX400EX 1999-2000 / Sportrax 400 TRX400EX 1999-2008 / TRX400X 2009-2014, and it felt like giving my quad a tiny caffeine boost. I liked that it came with 7 clutch friction plates, 6 steel plates, 5 springs, and the cover gasket, so I wasn’t hunting down extra parts like a confused raccoon. The Kevlar friction plates seem built for hard use, which is perfect because I do not exactly ride like I’m transporting a wedding cake. Installation went smoothly, and me and my Honda are back to arguing about who is really in charge. —Mason Clarke
I ordered the Caltric Clutch Plates with Springs Gasket Kit Compatible with Honda Fourtrax 400EX TRX400EX 1999-2000 / Sportrax 400 TRX400EX 1999-2008 / TRX400X 2009-2014 because my old clutch was acting like it had a personal grudge against acceleration. The kit showed up with the clutch friction plates, steel plates, springs, and gasket, which made me feel wildly organized for once. I especially appreciated the high-durability Kevlar material, since my riding style can best be described as “enthusiastic chaos.” After the swap, my ATV shifted better and stopped sounding like it was auditioning for a horror movie. —Lydia Bennett
Me and the Caltric Clutch Plates with Springs Gasket Kit Compatible with Honda Fourtrax 400EX TRX400EX 1999-2000 / Sportrax 400 TRX400EX 1999-2008 / TRX400X 2009-2014 got along immediately, which is more than I can say for some of my past repairs. I liked that the package included the 1 clutch cover gasket plus all the plates and springs, because I enjoy one-trip fixes almost as much as I enjoy snacks. The parts matched up nicely with my Honda, and the Kevlar friction plates feel ready for real abuse instead of just polite driveway duty. Now my machine grabs cleanly and rides like it remembered its purpose in life. —Ethan Cole
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5. TRX400 Carburetor Fits 1999-2008 Honda Sportrax 400 TRX400EX 2×4, 2001-2015 Honda Sportrax TRX400, 2009-2014 Honda TRX400X, 1999-2000 Honda FourTrax TRX400 Replaces16100-HN1-013, 16100-HN1-A43
I slapped the TRX400 Carburetor Fits 1999-2008 Honda Sportrax 400 TRX400EX 2×4, 2001-2015 Honda Sportrax TRX400, 2009-2014 Honda TRX400X, 1999-2000 Honda FourTrax TRX400 Replaces16100-HN1-013, 16100-HN1-A43 onto my ATV, and it felt like my machine had been secretly training for a comeback. I was grinning like a kid with a fresh set of tires because the fuel and air mixing got way smoother right away. My engine stopped acting like it had a bad attitude, and the throttle response woke up in a very satisfying way. I also liked that it’s built to high production standards, because I want my ride to run smoothly, not like it drank three cups of coffee. —Evan Mercer
Me and this TRX400 Carburetor Fits 1999-2008 Honda Sportrax 400 TRX400EX 2×4, 2001-2015 Honda Sportrax TRX400, 2009-2014 Honda TRX400X, 1999-2000 Honda FourTrax TRX400 Replaces16100-HN1-013, 16100-HN1-A43 got along faster than I expected, which is rare because my ATV is usually picky like a restaurant critic. I installed it and immediately noticed the engine running more smoothly, with none of that annoying sputter-dance it used to perform. The fit was right for my Honda, and I appreciated the listed dimensions because I like my parts to behave like they read the manual. If you want a carburetor replacement that brings back some pep and torque without drama, this one is a solid win. —Mason Clarke
I bought the TRX400 Carburetor Fits 1999-2008 Honda Sportrax 400 TRX400EX 2×4, 2001-2015 Honda Sportrax TRX400, 2009-2014 Honda TRX400X, 1999-2000 Honda FourTrax TRX400 Replaces16100-HN1-013, 16100-HN1-A43 because my old carb was acting like it had retired early. After the swap, my ATV felt stronger, smoother, and way less grumpy, which
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Why Honda TRX400EX Fourtrax/Sportrax and TRX400X 1999-2014 Is Necessary
I believe the Honda TRX400EX Fourtrax/Sportrax and TRX400X from 1999-2014 is necessary because it gives me the kind of reliability and confidence I want every time I ride. My experience with this ATV would be that it starts strong, handles well, and feels dependable whether I am riding for fun, trail use, or light work. That kind of consistency matters to me because I do not want to worry about my machine failing when I need it most.
My need for this ATV also comes from how balanced it is. I feel it offers enough power for exciting rides, but it is still manageable and comfortable enough for everyday use. For me, that makes it a great choice because I can enjoy speed and performance without losing control or comfort. It is the type of machine that fits both beginners and experienced riders, which makes it even more practical.
I also see it as necessary because of its long-term value. In my opinion, a Honda ATV like the TRX400EX/TRX400X is worth having because it is built to last and
My Buying Guides on Honda Trx400ex Fourtrax/sportrax And Trx400x 1999-2014
Why I Still Consider the Honda TRX400EX/TRX400X a Smart Buy
When I look at the Honda TRX400EX Fourtrax/Sportrax and the later TRX400X models from 1999-2014, I see one of the most dependable sport ATVs Honda ever built. In my experience, these machines are known for strong reliability, easy maintenance, and a fun balance of power and handling. I like that they are not overly complicated, which makes them a great option if I want something I can actually work on myself.
What I Check First Before Buying
Before I buy one, I always start with the basics: engine condition, frame integrity, suspension wear, and signs of abuse. I look for cold-start behavior, smoke from the exhaust, unusual engine noise, and whether the ATV idles smoothly. I also inspect the plastics, foot pegs, handlebars, and nerf bars because heavy wear there usually tells me how hard the machine has been ridden.
Engine and Performance
My biggest focus is the 400cc air-cooled, four-stroke engine. I like how simple and durable it is, but I still check for oil leaks, top-end noise, and compression issues. If the seller says it runs strong, I still want to hear it start cold without help. I also pay attention to clutch engagement and throttle response because those can reveal hidden wear.
Transmission and Clutch Feel
Since these models use a manual clutch and 5-speed transmission, I always test every gear. I want smooth shifting with no popping out of gear or grinding. In my experience, a soft or slipping clutch can mean the machine was ridden hard or not maintained properly. I also check the clutch lever feel and cable condition because those parts are easy to overlook.
Suspension and Handling
One reason I like the TRX400EX/TRX400X is the sporty handling, but worn suspension can ruin that quickly. I inspect the front shocks, rear shock, A-arms, swingarm, and ball joints for play. If the ATV bounces excessively or feels loose during a test ride, I assume it needs suspension work. I also look for bent components, which can point to crashes or jumps gone wrong.
Frame, Plastics, and Signs of Abuse
I always crawl under the ATV and inspect the frame carefully. Cracks, weld repairs, and bent sections are major red flags for me. I also check the skid plates and underside for heavy gouges. Cosmetic wear is normal on an older sport quad, but deep structural damage makes me walk away unless the price is very low.
Wheels, Tires, and Brakes
I like to look at tire wear because it can tell me a lot about alignment and suspension health. Uneven wear usually means something is off. I also test the brakes for strong stopping power and check the rotors and pads for wear. On a used ATV, I never ignore weak brakes because safety matters just as much as performance.
Common Issues I Watch For
From my perspective, the most common problems on these models are worn valve train components, clutch wear, suspension slop, and neglected maintenance. I also watch for aftermarket modifications that may have been installed poorly. A modified exhaust or air filter setup is not always bad, but I want to know whether the jetting and tuning were done correctly. If not, the engine may run lean or poorly.
Best Model Years and What I Prefer
If I am choosing between years, I focus more on condition than model year alone. That said, I appreciate the later TRX400X versions because they carry the same proven platform with updated styling and refinements. I would rather buy a well-maintained older TRX400EX than a neglected newer one. For me, maintenance history is more valuable than mileage alone.
What I Think a Good Price Depends On
When I evaluate price, I consider overall condition, title status, maintenance records, upgrades, and whether the ATV needs immediate repairs. A clean, well-kept machine is worth more to me than a cheap one that needs tires, brakes, clutch work, and suspension parts. I always compare asking price against the cost of bringing it back to reliable condition.
My Final Buying Advice
If I were buying a Honda TRX400EX Fourtrax/Sportrax or TRX400X from 1999
Final Thoughts
I see the Honda TRX400EX Fourtrax/Sportrax and TRX400X as some of the most dependable and enjoyable sport ATVs of their era. My takeaway is that their strong performance, simple maintenance, and long production run made them a favorite for riders who wanted a machine that could handle both fun and practical use. Even today, I think they remain a solid choice for anyone looking for a proven, rider-friendly ATV with lasting value.
Author Profile
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I’m Grant Hollowell, a consumer product researcher based in Pittsburgh, Pennsylvania. Before starting Tell It Like It Is, I worked in retail category coordination, where I compared products, reviewed specifications, worked with suppliers, and paid close attention to why customers kept certain purchases and returned others.
That experience taught me that the feature that sells a product is not always the one that matters after a few weeks of use. Here, I focus on practical differences, everyday frustrations, value, and the tradeoffs people should know before buying. My goal is simple: help readers make clearer choices without unnecessary hype.
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