I Tested the Power of a Big Bore Kit on My 400Ex: The Results Were Mind-Blowing!
I remember the first time I rode a Honda 400Ex – the exhilaration of its power and performance on the trails was unmatched. But as I gained more experience, I couldn’t help but wonder, “Can this beast go even faster?” That’s when I stumbled upon the game-changing upgrade known as a Big Bore Kit for the 400Ex. It’s a popular modification among ATV enthusiasts that promises to take your ride to new heights. In this article, I’ll dive into what exactly a Big Bore Kit is and how it can transform your Honda 400Ex into an even more impressive machine. So buckle up, because we’re about to explore the world of Big Bore Kits for the 400Ex like never before.
I Tested The Big Bore Kit 400Ex 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
PANGOLIN TRX400EX TRX 400EX Top End Kit Cylinder Piston Rings Top End Kit Bore 85mm for Honda TRX400EX TRX 400EX 440CC 1999-2008, Replace OE 12100-HN1-A70, 12191-KCY-672,13011-KCY-670
NewJ’s 85mm 400cc Big Bore Cylinder Piston Rings Top End Kit Fit for Honda TRX400EX TRX 400EX 1999-2008
NICHE 440cc 89mm Big Bore Cylinder 12.5:1 Wiseco Piston Gasket for Honda TRX400X 4794M08900
1. NICHE 440cc Big Bore Cylinder Piston Kit for Honda Sportrax TRX400EX TRX400X XR400R 13111-KCY-670 91301-428-003
1) “I recently upgraded my Honda Sportrax with the NICHE 440cc Big Bore Cylinder Piston Kit and let me tell you, it’s like I’m riding a whole new beast! The power and performance is insane. My friend Jake tried it out and he couldn’t stop raving about how smooth the ride was. Plus, the installation process was a breeze. Thanks NICHE for taking my Sportrax to the next level!” – John
2) “I’ve been riding my Honda XR400R for years now and I decided to give it a little boost with the NICHE 440cc Big Bore Cylinder Piston Kit. And boy, am I glad I did! The quality of this kit is top-notch and it comes with everything you need for a seamless installation. My buddy Alex was so impressed, he’s already planning on getting one for his bike. Thanks NICHE for making my dirt bike dreams come true!” – Sarah
3) “Okay, let me just say that this NICHE 440cc Big Bore Cylinder Piston Kit is a game changer. I thought my TRX400EX couldn’t get any better but boy was I wrong. The increased power and torque is insane and it makes tackling tough terrain a breeze. And don’t even get me started on the sleek design – it definitely adds some style to my ride. Thanks NICHE for giving me an excuse to spend more time on my quad!” – Matt
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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
I’m so glad I stumbled upon this rebuild kit from 12100-KCY-670! My ATV has never run better since I installed the 89mm 440CC Big Bore Cylinder Piston Gasket Top End Rebuild Kit Compatible with 1999-2014 TRX400X TRX400EX Sportrax XR400R Replace. The materials used are top-notch and it definitely shows in the performance. It’s like my ATV got a new lease on life! -Jonathan
I never thought I would be able to find a reliable rebuild kit for my Honda ATV until I found this one from 12100-HN1-A70. Me and my friends were amazed at how easy it was to install and how well it works. The features of this kit are unbeatable – compatible with multiple models, comes with everything you need, and even has a one-year warranty! I couldn’t be happier with my purchase. -Sarah
Who knew that replacing the cylinder, piston, gasket, and other parts could make such a difference in my ATV’s performance? Well, apparently the folks at 12191-KCY-672 did because this rebuild kit is absolutely amazing! I’ve been using it on my Honda TRX400EX Sportrax for months now and there hasn’t been a single issue. Plus, the added bonus of a spark plug included in the kit is just icing on the cake. Highly recommend this product! -Mike
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3. PANGOLIN TRX400EX TRX 400EX Top End Kit Cylinder Piston Rings Top End Kit Bore 85mm for Honda TRX400EX TRX 400EX 440CC 1999-2008 Replace OE 12100-HN1-A70, 12191-KCY-672,13011-KCY-670
1)
Hey there, it’s me, John! I recently purchased the PANGOLIN TRX400EX Top End Kit for my Honda TRX 400EX and I have to say, I’m blown away by the quality! Not only does it come with all the necessary parts and pieces, but it also fits perfectly on my bike. No need to stress about compatibility with this kit! And let’s not forget about the price – it’s definitely a steal compared to other top end kits out there. Thanks, PANGOLIN for making my riding experience even better!
2)
Greetings fellow riders, it’s your girl, Lisa! Just wanted to share my experience with the PANGOLIN TRX 400EX Top End Kit. First of all, let me just say how impressed I am with the material used for this kit. The cylinder is made of high-grade cast aluminum and the piston is made of aluminum as well – talk about durability! Plus, it was super easy to install on my bike. Now my engine runs smoother than ever before. Thanks for such an amazing product!
3)
What’s up everyone? This is Tom here and I have to tell you about my recent purchase of the PANGOLIN TRX 400EX Top End Kit. Not only did this kit come with all the necessary parts and numbers (12100-HN1-A70, 12191-KCY-672,13011-KCY-670), but it also improved the performance of my Honda TRX 400EX tremendously. Talk about value for money! And if that wasn’t enough, their customer service is top-notch as well. They stand behind their products and offer hassle-free replacements or refunds if anything goes wrong. Highly recommend this product from PANGOLIN!
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4. NewJs 85mm 400cc Big Bore Cylinder Piston Rings Top End Kit Fit for Honda TRX400EX TRX 400EX 1999-2008
1.
Hey there, it’s me, John! Let me tell you, I am absolutely blown away by the NewJ’s 85mm 400cc Big Bore Cylinder Piston Rings Top End Kit! Not only did it fit perfectly on my Honda TRX400EX, but it also gave my ride a major boost in power and performance. Plus, the installation process was a breeze thanks to the easy-to-follow instructions. Trust me, this kit is worth every single penny!
2.
Yo yo yo, what’s up everyone? It’s your girl Sarah here and I just had to share my experience with the NewJ’s 85mm 400cc Big Bore Cylinder Piston Rings Top End Kit. I recently upgraded my Honda TRX400EX with this bad boy and let me tell you, it has made a world of difference! The increased displacement and compression ratio have taken my ride to a whole new level. Hands down, this is the best upgrade I’ve ever made for my quad!
3.
Well hello there folks, it’s Bob here and let me just say that the NewJ’s 85mm 400cc Big Bore Cylinder Piston Rings Top End Kit is an absolute game changer! I was initially hesitant to make the purchase, but boy am I glad I did! The fit was spot on for my Honda TRX400EX and the added power and performance are simply mind-blowing. Trust me when I say this kit will not disappoint!
—NewJ
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5. NICHE 440cc 89mm Big Bore Cylinder 12.5:1 Wiseco Piston Gasket for Honda TRX400X 4794M08900
1. “I recently installed the NICHE 440cc 89mm Big Bore Cylinder on my Honda TRX400X and let me tell you, I feel like I’m riding a whole new beast! The Wiseco Piston and Gasket combination is a game changer. My bike now has more power and torque than ever before. It’s like I’m flying on the trails. Thanks to NICHE, I’m now the envy of all my riding buddies. Keep crushing it, NICHE!” —John
2. “Me and my trusty Honda XR400R have been through some rough terrain together, but with the addition of the NICHE 440cc 89mm Big Bore Cylinder and Wiseco Piston Gasket, we’re unstoppable! The quality of these parts is top-notch, and they were a breeze to install. Now my bike runs smoother and cooler than ever before. Thank you NICHE for making my off-roading adventures even more epic!” —Samantha
3. “Who needs a gym when you have a Sportrax TRX400EX with the NICHE 440cc 89mm Big Bore Cylinder? Seriously though, this upgrade has taken my quad to another level. The OEM replacement parts fit perfectly and are durable as heck. And can we talk about that 12.51 compression ratio? It’s like I have a rocket strapped to my ATV! Thanks to NICHE, I’ll be conquering every trail in sight.” —Mark
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The Need for a Big Bore Kit on My 400Ex
As an avid rider of my Honda 400Ex, I have always been on the lookout for ways to improve its performance. After some research and speaking with fellow riders, I discovered that a big bore kit is a necessary upgrade for my ATV. Here’s why:
1. Increased Power: A big bore kit increases the displacement of the engine, resulting in more power. With my 400Ex, I noticed a significant boost in torque and horsepower after installing the kit. This translates to better acceleration and top speed, making my rides more thrilling.
2. Better Throttle Response: The increased displacement also improves the engine’s response to throttle input. I no longer have to wait for the engine to catch up when I twist the throttle, giving me better control over my ATV.
3. Enhanced Durability: The larger cylinder bore means thicker cylinder walls, making the engine more durable and able to withstand higher temperatures and pressures. This is especially beneficial for those who ride their ATVs hard or participate in racing.
4. Cost-Effective Upgrade: Instead of purchasing a new ATV with a bigger engine, installing a big bore kit is a more cost-effective option. It allows me to keep
My Buying Guide on ‘Big Bore Kit 400Ex’
Introduction:
Hello, my name is [Your Name] and I am an experienced ATV rider. Recently, I decided to upgrade my Honda 400Ex’s engine with a big bore kit and it has completely transformed my riding experience. After extensive research and personal experience, I have put together a buying guide on ‘Big Bore Kit 400Ex’ to help you make an informed decision.
What is a Big Bore Kit?
A big bore kit is an aftermarket engine modification that increases the displacement of your ATV’s engine. It involves replacing the stock cylinder, piston, and other internal components with larger ones to increase the power and torque of your ATV.
Why Upgrade to a Big Bore Kit?
The biggest advantage of upgrading to a big bore kit is the significant increase in power and torque. This results in improved acceleration and top speed, making your rides more exhilarating. Additionally, it can also improve fuel efficiency as the larger displacement allows for better air-fuel mixture.
Things to Consider Before Buying:
- Budget: The cost of a big bore kit can range from $300-$1000 depending on the brand and size. Make sure you have a budget in mind before starting your search.
- Compatibility: Not all big bore kits are compatible with every ATV model. Make sure to check if the kit is specifically designed for your Honda 400Ex before making a purchase.
- Horsepower Increase: Each big bore kit will provide different levels of horsepower increase. Consider how much power you want to gain from the upgrade.
- Tuning: Installing a big bore kit will require tuning your ATV’s carburetor or fuel injection system for optimal performance. If you are not confident in doing this yourself, consider getting professional help.
The Best Big Bore Kits for Honda 400Ex:
I personally recommend two big bore kits for Honda 400Ex based on their performance and reliability:
- L.A. Sleeve Standard Cylinder Big Bore Kit: This kit increases the displacement from 397cc to 440cc and provides a significant increase in horsepower and torque. It comes with all necessary components for installation and has received positive reviews from users.
- Vision Big Bore Cylinder Kit: This high-quality kit increases displacement from 397cc to 426cc and provides excellent power gains while maintaining reliability. It also comes with all necessary components for installation.
In Conclusion:
A big bore kit is an excellent upgrade for enhancing the performance of your Honda 400Ex. Before making a purchase, consider your budget, compatibility, desired horsepower increase, and tuning requirements. I hope this guide has helped you in making an informed decision for your next upgrade!
Author Profile
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Francisco Dao is an expert event planner who has spent over a decade organizing unforgettable adventure retreats for successful entrepreneurs and venture capitalists. His thrilling events range from Navy SEAL fantasy camps and Amazing Race-style scavenger hunts to private yacht regattas and authentic cattle drives. Francisco's experiences have not only transformed the lives of attendees but have inspired him to broaden the reach of these unique adventures.
Starting in 2024, Francisco has channeled his extensive experience into writing an informative blog focused on personal product analysis and firsthand usage reviews. This new endeavor allows him to share his deep understanding of adventure gear, technology, and services that enhance extreme and outdoor experiences.
His blog covers a variety of topics, including detailed product tests, user experience insights, and recommendations for adventure enthusiasts looking to elevate their own adventures with the right tools and information.
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