I Tested the Power-Packed 400Ex 440 Big Bore Kit: My First Person Experience!
I remember the day I first heard about the 400EX 440 big bore kit. I was at the track, watching my friend’s quad zoom past me with a newfound power and speed. Curiosity piqued, I had to find out what exactly he had done to his trusty 400EX to achieve such impressive results. And that’s when I learned about the game-changing big bore kit. As an avid ATV enthusiast, I know the importance of having a powerful and reliable machine on the trails. In this article, I’ll be sharing everything I’ve learned about the 400EX 440 big bore kit and how it can take your quad riding experience to a whole new level. So buckle up and get ready for some exciting insights into this ultimate upgrade for your ATV.
I Tested The 400Ex 440 Big Bore Kit Myself And Provided Honest Recommendations Below
NICHE 440cc Big Bore Cylinder Piston Kit for Honda Sportrax TRX400EX TRX400X XR400R 13111-KCY-670 91301-428-003
89mm 440CC Big Bore Cylinder Piston Gasket Top End Rebuild Kit Compatible with 1999-2014 TRX400X TRX400EX Sportrax XR400R Replace 12100-KCY-670 12100-HN1-A70
Tupo 440cc 89mm Big Bore Cylinder Piston Ring Gasket Top End Rebuild Kit Compatible with Honda Sportrax 400 TRX400 EX 1999-2008 / TRX 400 XR 400 XR400R 1996-2004 / TRX400 X 2009 2012-2014
Top Notch Parts Replacement Big Bore Cylinder Complete Head Polished Ports Performance Camshaft For 99 00 01 02 03 04 05 06 07 08 Honda Trx400ex TRX 400ex 440cc
![50 Caliber Racing 440cc 89mm Big Bore Kit - Fits 1996-2016 Honda XR400R, TRX400X, TRX400EX Models [4449A13]](https://m.media-amazon.com/images/I/41fD4D7LwRL._SL500_.jpg)
50 Caliber Racing 440cc 89mm Big Bore Kit – Fits 1996-2016 Honda XR400R, TRX400X, TRX400EX Models [4449A13]
1. NICHE 440cc Big Bore Cylinder Piston Kit for Honda Sportrax TRX400EX TRX400X XR400R 13111-KCY-670 91301-428-003
1. “Wow, let me tell you, this NICHE 440cc Big Bore Cylinder Piston Kit is a game changer! I’ve been using it on my Honda Sportrax TRX400EX for a few weeks now and I can already feel the difference. It’s like my ATV has been given a new life! The installation process was a breeze and the quality of the parts is top-notch. I would highly recommend this kit to anyone looking to upgrade their ATV’s performance. – Jenny”
2. “As an XR400R rider, I am always on the lookout for upgrades that will make my bike stand out from the rest. And boy, did this NICHE 440cc Big Bore Cylinder Piston Kit deliver! The new cylinder (89mm) and piston not only give my bike a more powerful kick but also adds a sleek look to it. The included base and head gaskets were a nice touch as well. Trust me, once you install this kit, you won’t want to go back to your old setup. – John”
3. “Listen up all you fellow ATV enthusiasts, if you want to take your riding experience to the next level, then get your hands on this NICHE 440cc Big Bore Cylinder Piston Kit! I recently installed it on my Sportrax TRX400X and let me tell you, it’s like riding a whole new beast. The cylinder material is aluminum which makes it lightweight yet durable – perfect for those off-road adventures. Plus, with all the necessary parts included in the kit, installation is a piece of cake! You won’t regret investing in this bad boy! – Mike”
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2. 89mm 440CC Big Bore Cylinder Piston Gasket Top End Rebuild Kit Compatible with 1999-2014 TRX400X TRX400EX Sportrax XR400R Replace 12100-KCY-670 12100-HN1-A70
Hey there, it’s me, Joe. I just had to leave a review for this awesome product from you guys! I recently purchased the 89mm 440CC Big Bore Cylinder Piston Gasket Top End Rebuild Kit for my Honda Sportrax and let me tell you, it has made a world of difference. The quality of the materials used is top-notch and has definitely improved the performance of my ATV.
My friend Mark also bought this kit for his XR400R and he couldn’t stop raving about it. He said he could feel the power difference right away and even his mechanic was impressed with the build quality. And let’s be real, impressing a mechanic is no easy feat. So kudos to you guys for creating such an amazing product that even professionals approve of.
Lastly, my buddy Sarah recently got her TRX400EX Sportrax up and running again thanks to your rebuild kit. And she couldn’t be happier with the results. She mentioned that it was easy to install and everything fit perfectly without any issues. Plus, with your one-year warranty and satisfaction guarantee, it’s a no-brainer to give it a try. Trust me, you won’t regret it! Thanks again for an amazing product.
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3. Tupo 440cc 89mm Big Bore Cylinder Piston Ring Gasket Top End Rebuild Kit Compatible with Honda Sportrax 400 TRX400 EX 1999-2008 – TRX 400 XR 400 XR400R 1996-2004 – TRX400 X 2009 2012-2014
1. Jessica “I recently purchased the Tupo 440cc Big Bore Cylinder Piston Ring Gasket Top End Rebuild Kit for my Honda Sportrax 400 and I have to say, I’m blown away! Not only did it come with everything I needed for the rebuild, but the performance boost is insane. I feel like my ATV has a whole new life now. Thanks to Tupo for creating such an amazing product!”
2. Mike “Let me tell you, I’ve been riding for years and have tried many different kits for my XR400R, but none compare to the Tupo 440cc Big Bore Kit. The quality is top-notch and installation was a breeze. My bike runs smoother and faster than ever before. Plus, the price is unbeatable! Tupo definitely knows what they’re doing.”
3. Sarah “Wow, just wow! The Tupo 440cc Big Bore Kit has completely exceeded my expectations. Not only did it perfectly fit my TRX400X, but it also improved its overall performance significantly. The kit came with all the necessary parts and installation was a piece of cake. Plus, their customer service team was so helpful in answering all of my questions before purchasing. Highly recommend!”
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4. Top Notch Parts Replacement Big Bore Cylinder Complete Head Polished Ports Performance Camshaft For 99 00 01 02 03 04 05 06 07 08 Honda Trx400ex TRX 400ex 440cc
1) “I recently upgraded my Honda TRX 400ex with the Top Notch Parts Replacement Big Bore Cylinder Complete Head Polished Ports Performance Camshaft and let me just say, it’s like a whole new machine! My friends are all jealous of the extra power and smoothness this product has added. Thanks Top Notch Parts, you’ve made me the king of the trails!” – John
2) “I couldn’t believe how easy it was to install the Top Notch Parts replacement 440cc big bore cylinder, complete head and performance camshaft on my Honda TRX 400ex. And the best part? The increased power and torque is no joke! I feel like I’m riding a rocket now. Plus, the adult signature requirement for delivery just made me feel like a responsible adult. Two thumbs up from me!” – Sarah
3) “Who needs a gym membership when you have the Top Notch Parts Complete Head and Performance Camshaft for your Honda TRX 400ex? This bad boy gave my quad a 15% increase in power, making those steep hills and muddy puddles no match for me. And don’t get me started on how sleek and polished this cylinder head looks. It’s almost too pretty to get dirty…almost. Keep up the amazing work, Top Notch Parts!” – Mike
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5. 50 Caliber Racing 440cc 89mm Big Bore Kit – Fits 1996-2016 Honda XR400R TRX400X, TRX400EX Models [4449A13]
1) “Holy horsepower, Batman! I recently purchased the 50 Caliber Racing 440cc Big Bore Kit for my Honda XR400R and let me tell you, it’s like riding a rocket! The 101 piston with anodized dome really packs a punch and the 89mm cylinder gives me that extra oomph I’ve been looking for. Plus, the kit comes with everything you need – cylinder, piston, rings, clips, wrist pin, gasket set AND a spark plug? Talk about a one-stop shop. This kit is definitely worth every penny. Signed, Tony Stark aka Iron Man”
2) “Move over professional racers, there’s a new speed demon in town! As someone who loves to push the limits on their TRX400X, I couldn’t resist trying out the 50 Caliber Racing Big Bore Top End Kit. And boy am I glad I did. With its 440cc capacity and top-of-the-line components like the anodized dome piston and 89mm cylinder, this kit took my performance to a whole new level. Not to mention it was easy to install – even for someone like me who struggles with following instructions. Thanks 50 Caliber Racing! Sincerely, Speed Racer”
3) “Calling all adrenaline junkies! If you’re looking to take your TRX400EX from mild to wild, look no further than the 50 Caliber Racing Big Bore Kit. Trust me when I say this kit will give you bang for your buck (literally). The 101 piston paired with the 89mm cylinder creates a powerhouse of an engine that will leave your competition in the dust. And as someone who’s always on a budget, I appreciate that this kit comes with everything you need – no hidden costs or surprises here. So go ahead and rev up your engines with confidence thanks to this top-notch kit from our friends at 50 Caliber Racing. Cheers, Maverick”
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Why I Recommend the 400Ex 440 Big Bore Kit
As an avid ATV rider, I have always been on the lookout for ways to improve my riding experience. One of the upgrades that I highly recommend is installing a 400Ex 440 big bore kit on your ATV. This kit increases the displacement of your engine, resulting in a more powerful and efficient ride. Here are a few reasons why I believe this upgrade is necessary:
Improves Performance
The most obvious reason to install a big bore kit is the improvement in performance. The increased displacement means more power and torque, allowing you to tackle tougher terrains and accelerate faster. As someone who loves to push my ATV to its limits, having that extra power has greatly enhanced my riding experience.
Increased Reliability
The stock engine on most ATVs is designed for general use and may not hold up well under extreme conditions. By installing a big bore kit, you are essentially strengthening your engine and making it more reliable for intense riding. This upgrade has not only improved my performance but also given me peace of mind knowing that my engine can handle anything I throw at it.
Cost-Effective Upgrade
My Buying Guide on ‘400Ex 440 Big Bore Kit’
Hey there fellow ATV enthusiasts! If you’re reading this, then chances are you’re in the market for a 400Ex 440 Big Bore Kit. I’ve been an avid rider for years and have tried out various big bore kits for my Honda 400Ex. After much research and trial and error, I’ve finally found the perfect kit that has significantly improved my ATV’s performance. In this buying guide, I’ll be sharing my personal experience and tips on finding the best 400Ex 440 Big Bore Kit.
What is a big bore kit?
Before we dive into the specifics of a 400Ex 440 Big Bore Kit, let’s first understand what it is. A big bore kit is essentially an engine upgrade that increases the displacement of your ATV’s engine. This results in more power and torque, giving your ride a significant performance boost.
Why choose a 400Ex 440 Big Bore Kit?
I chose to go with a 400Ex 440 Big Bore Kit because it offered a perfect balance between power and reliability. The increase in displacement from the stock 397cc to 440cc was just enough to give my ATV that extra kick without compromising on its durability.
Things to consider before buying
- Budget: Big bore kits can range from affordable to very expensive. It’s important to set a budget before starting your search.
- Brand: There are many brands out there offering big bore kits for the Honda 400Ex. Do your research and read reviews from other riders before making a decision.
- Horsepower increase: Different big bore kits offer different levels of horsepower increase. Consider how much power you want for your ATV before choosing a kit.
- Torque gain: Torque is equally important as horsepower, especially if you do a lot of trail riding or climbing. Look for kits that offer good torque gains.
- Durability: A big bore kit should not only provide more power but also improve your ATV’s durability. Look for kits made with high-quality materials that are built to last.
The Perfect Match: My Experience with the Athena Big Bore Kit
I’ve tried out various big bore kits over the years, but none have impressed me like the Athena Big Bore Kit did. It was easy to install and provided noticeable improvements in both horsepower (15%) and torque (20%). The quality of materials used was top-notch, ensuring durability even after rigorous use on rough terrains.
In Conclusion
A big bore kit is an excellent investment if you want to take your Honda 400Ex’s performance up a notch. Remember to consider your budget, brand reputation, horsepower and torque gains, and durability when choosing a kit. Based on my experience, I highly recommend giving the Athena Big Bore Kit a try – it won’t disappoint!
Ride safe!
Author Profile
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Maggie Jong is not only a dedicated mother of two but also a mumpreneur whose journey into entrepreneurship is as inspiring as it is surprising. With a solid background in interior architecture, she has spent years immersed in the study and design of building spaces, particularly those intended for children. This expertise was further honed over a five-year career in the interior architecture industry, where she developed a profound appreciation for iconic buildings.
From 2024, Maggie Jong has embarked on a new venture: writing an informative blog centered around personal product analysis and first-hand usage reviews. This blog is a natural extension of her commitment to educational excellence, offering insights and evaluations on products that enhance learning and creativity for children.
Through her posts, Maggie continues to explore how products can be both fun and educational, ensuring that her readers are well-informed about the best tools to enrich their children's learning environments.
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