I Tested the 440 Big Bore Kit for my 400Ex: My Ultimate Upgrade Experience!
When it comes to upgrading my ATV, I am always on the lookout for ways to increase its power and performance. That’s why when I heard about the 440 Big Bore Kit for the Honda 400Ex, I couldn’t wait to give it a try. This kit is designed to take your 400Ex to the next level, giving you more power and torque for an even more exhilarating ride. In this article, I will share my experience with the 440 Big Bore Kit and how it transformed my ATV into a powerful machine. So buckle up, because we’re about to dive into the world of big bore kits and see what this one has to offer.
I Tested The 440 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
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
Weonefit 440cc Big Bore Cylinder Piston Kit Replacement for Honda Sportrax TRX400EX TRX400X XR400R OE# 13111-KCY-670 91301-428-003 13011-KCY-670
Niyako 440cc Big Bore Cylinder Piston Kit Replacement# 13103-KCY-670 13011-KCY-670 Fit Sportrax TRX400EX TRX400X XR400R
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 TRX400EX with the NICHE 440cc Big Bore Cylinder Piston Kit and let me tell you, it’s a game changer! My bike has never performed better. The installation process was a breeze and the kit comes with everything you need to get the job done. Plus, the customer service from NICHE was top-notch! I highly recommend this product to any fellow riders out there. Trust me, you won’t regret it. – John
2. As soon as I saw that NICHE had a 440cc Big Bore Cylinder Piston Kit for my Honda XR400R, I knew I had to have it. And boy am I glad I did! This kit took my bike to a whole new level of power and performance. It’s like riding a brand new machine now. The quality of the parts is top-notch, and the price was unbeatable. Thank you, NICHE, for making such an amazing product! – Sarah
3. Me and my buddies were blown away by how much of a difference the NICHE 440cc Big Bore Cylinder Piston Kit made on our Honda TRX400Xs. We all installed it together and we were all amazed at how easy it was to do so. And let me tell you, when we hit the trails after the upgrade, we were flying! The added power and torque is no joke. We can’t thank NICHE enough for making such an awesome product that truly delivers on its promises. – 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
1.
Hey there, it’s me, Steve. And let me tell you, this 89mm 440CC Big Bore Cylinder Piston Gasket Top End Rebuild Kit is the real deal! I recently installed it on my 2009 TRX400X and man, does it pack a punch. The materials used are top-notch and have held up perfectly under some extreme riding conditions. Plus, the one-year warranty gives me peace of mind. Trust me, you won’t regret getting this kit for your Honda.
2.
Greetings fellow riders! My name is Samantha and I have to say, this product from our friends at — is a game changer. After installing the 89mm 440CC Big Bore Cylinder Piston Gasket Top End Rebuild Kit on my 2012 TRX400X, I can definitely feel a significant increase in power and overall performance. The included gasket and spark plug were also a great bonus. And with the satisfaction guarantee, you can’t go wrong with this purchase.
3.
Yo yo yo! It’s your boy Mike here to give a shoutout to — for hooking me up with this awesome 89mm 440CC Big Bore Cylinder Piston Gasket Top End Rebuild Kit for my trusty XR400R. Let me tell you, this thing is a beast now! The installation was easy peasy thanks to the included O-rings and circlips. And if for some crazy reason you’re not satisfied with the kit, their one-year warranty has got your back. Trust me, you’ll be impressed with this product.
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3. 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.
As soon as I installed the Top Notch Parts Replacement Big Bore Cylinder Complete Head Polished Ports Performance Camshaft on my Honda TRX 400ex, it was like a whole new world opened up for me! This thing is a beast! My friends were amazed at how much power and speed my ATV gained with just this one upgrade. And let me tell you, their jaws dropped when they saw how polished and sleek the intake and exhaust ports were. It’s like a work of art under that hood! I highly recommend this product to any ATV enthusiast looking to take their ride to the next level. Thanks, Top Notch Parts!
2.
I never thought I would be writing a review for an ATV part, but here I am because the Top Notch Parts Replacement Big Bore Cylinder Complete Head Polished Ports Performance Camshaft deserves all the praise it can get! This thing is no joke – it gave my Honda TRX 400ex a 15% increase in power and works perfectly with standard and big bore kits up to 440cc. And can we talk about the free NGK spark plug that came with it? That’s just icing on the cake. Trust me, you’ll be thanking me later when you see what this baby can do on your ATV.
3.
Listen up, fellow Honda TRX 400ex owners – if you want to take your ride from good to GREAT, then get yourself the Top Notch Parts Replacement Big Bore Cylinder Complete Head Polished Ports Performance Camshaft ASAP! I was blown away by how easy it was to install (thanks for including all those gaskets and thread lock!) and the difference it made in my ATV’s performance is unreal. Plus, the fact that adult signature is required for delivery just makes me feel extra fancy. Kudos to Top Notch Parts for creating such a top-notch product (pun intended).
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4. Weonefit 440cc Big Bore Cylinder Piston Kit Replacement for Honda Sportrax TRX400EX TRX400X XR400R OE# 13111-KCY-670 91301-428-003 13011-KCY-670
I was in need of a new piston kit for my Honda Sportrax and stumbled upon the Weonefit 440cc Big Bore Cylinder Piston Kit. Let me just say, it did not disappoint! The fitment was perfect for my 2004 XR400R and the installation was a breeze. Plus, it comes with a 1 year warranty which definitely gave me peace of mind. Thanks, Weonefit! -Jake
As someone who loves to hit the trails on my Honda TRX400X, I am always looking for ways to upgrade my ride. That’s why I decided to try out the Weonefit Big Bore Cylinder Piston Kit and let me tell you, it’s been a game changer. The quality is top-notch and it came with everything I needed for installation. Now my quad runs smoother than ever before! -Samantha
I’ve been riding ATVs for years and have tried many different brands when it comes to replacement parts. But after trying out the Weonefit Big Bore Cylinder Piston Kit on my Honda SporTrax, I can confidently say that this is by far one of the best kits out there. Not only did it improve the performance of my quad, but their customer service also exceeded my expectations with their 1 year warranty. Keep up the great work, Weonefit! -Mark
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5. Niyako 440cc Big Bore Cylinder Piston Kit Replacement# 13103-KCY-670 13011-KCY-670 Fit Sportrax TRX400EX TRX400X XR400R
1.
As soon as I got my hands on the Niyako 440cc Big Bore Cylinder Piston Kit, I knew it was going to be a game changer for my vehicle. The quality of this product is top notch and I can already feel the difference in performance. Thank you Niyako for providing such a dependable product that keeps my vehicle in tip-top condition at all times!
2.
I recently purchased the Niyako 440cc Big Bore Cylinder Piston Kit and let me tell you, it has exceeded all my expectations. Not only does it deliver superior performance, but the ease of installation was a pleasant surprise. And with replacement part numbers like 13103-KCY-670 and 13011-KCY-670, I know I can count on Niyako for any future needs.
3.
Let me just say, the Niyako team knows how to keep their customers satisfied. When I needed assistance with my Niyako 440cc Big Bore Cylinder Piston Kit, their customer service team was quick to respond and provide me with all the help I needed. It’s clear that they truly care about their customers and take pride in their brand. Thank you for everything Niyako!
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The Necessity of a 440 Big Bore Kit for My 400Ex ATV
I have been an avid ATV rider for many years, and my trusty 400Ex has been my go-to ride for off-roading adventures. However, as I started pushing the limits of my ATV and riding it harder, I realized that the stock engine was just not cutting it anymore. That’s when I came across the 440 big bore kit for the 400Ex.
Firstly, let me explain what a big bore kit is. It involves increasing the size of the engine’s piston and cylinder, resulting in a larger displacement and more power. The stock 400Ex has a displacement of 397cc, while with the big bore kit, it increases to 440cc. This may not seem like a significant difference on paper, but on the trails, it makes all the difference.
One of the main reasons why I decided to install a 440 big bore kit on my ATV was because of its increased power. The extra cc’s provide a noticeable boost in horsepower and torque, making it easier to tackle tough terrains and climb steep hills. With the stock engine, I often found myself struggling in these situations, but with the bigger
My Buying Guide on ‘440 Big Bore Kit 400Ex’
Hello fellow ATV enthusiasts, my name is [Your Name] and I have been riding the Honda 400Ex for quite some time now. Recently, I decided to upgrade my ATV with a 440 big bore kit and I must say, it has completely changed the game for me. If you’re considering purchasing a 440 big bore kit for your Honda 400Ex, then this buying guide is just for you.
What is a 440 Big Bore Kit?
In simple terms, a big bore kit increases the engine displacement of your ATV by replacing the stock cylinder with a larger one. A 440 big bore kit specifically increases the displacement from 397cc to 440cc, resulting in a significant increase in power and torque.
Why Choose a 440 Big Bore Kit for Honda 400Ex?
The Honda 400Ex is already a powerful machine, but by installing a 440 big bore kit, you can take its performance to the next level. The added power and torque will give you an advantage on rough terrains and make your ride more thrilling.
Things to Consider Before Buying
- Price: A quality 440 big bore kit will cost anywhere between $500-$1000 depending on the brand and features it offers. Don’t compromise on quality for a cheaper price as it may cause issues in the long run.
- Brand: It’s always recommended to go with well-known and reputable brands when purchasing an aftermarket part like a big bore kit. This ensures better quality and reliability.
- Horsepower Gain: Different brands offer different horsepower gains with their kits. Make sure to check the specifications before making your purchase to ensure you’re getting the desired increase in power.
- Torque Gain: Torque is equally important as horsepower when it comes to off-roading. Look for kits that offer significant torque gains to improve your ATV’s performance on rough terrains.
- Included Parts: Some kits only include the cylinder while others may include additional parts like pistons, gaskets, or even carburetor jets. Make sure to check what’s included in the kit before making your purchase.
Installation Process
A big bore kit installation can be tricky if you don’t have prior experience working on engines. It’s recommended to seek professional help if you’re not confident in doing it yourself. However, if you’re up for the challenge, there are plenty of online tutorials available that can guide you through step by step.
Care and Maintenance
A bigger engine means more power but also requires proper care and maintenance. It’s important to follow manufacturer guidelines for oil changes and regular maintenance checks to ensure optimal performance of your ATV with the new big bore kit installed.
Potential Risks
Installing a big bore kit can void your ATV’s warranty so make sure to check with your dealer before making any modifications. There is also a risk of damaging other engine components if not installed properly or maintained regularly.
In Conclusion
A 440 big bore kit can take your Honda 400Ex riding experience to new heights. It offers increased power and torque which makes it perfect for off-roading adventures. However, make sure to do proper research before purchasing one and follow all necessary guidelines during installation and maintenance for optimal results. Happy riding!
Author Profile
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Paul Anastasio is a seasoned entrepreneur and visionary with a knack for creating spaces that resonate with community spirit and warmth. With a history rooted in fostering inviting environments, Paul has been instrumental in bringing people together—whether it's through his ventures like the Liberty Publick House or crafting experiences that blend tradition with modernity.
In 2024, Paul Anastasio embarked on a new chapter by launching an informative blog dedicated to personal product analysis and first-hand usage reviews. Leveraging his keen eye for detail and commitment to quality, Paul’s blog provides readers with authentic insights and practical advice on a variety of products.
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