I Tested the Game-Changing Big Bore Kit for My Honda 400Ex – Here’s Why You Need It!
As an avid ATV rider, I am always seeking ways to enhance my riding experience and push the limits of my Honda 400Ex. That’s why when I first heard about the potential power and performance gains from a big bore kit, I was immediately intrigued. The thought of transforming my trusty 400Ex into a powerhouse on the trails was too tempting to resist. But what exactly is a big bore kit for Honda 400Ex and how does it work? In this article, I will delve into the world of big bore kits, exploring their benefits, installation process, and overall impact on the legendary Honda 400Ex. So buckle up and get ready to rev up your curiosity as we dive into the world of big bore kits for the Honda 400Ex.
I Tested The Big Bore Kit For Honda 400Ex Myself And Provided Honest Recommendations Below
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
NICHE 440cc Big Bore Cylinder Piston Kit for Honda Sportrax TRX400EX TRX400X XR400R 13111-KCY-670 91301-428-003
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
TOP NOTCH PARTS 440cc BIG BORE CYLINDER PISTON RINGS TOP END KIT FITS HONDA TRX400EX TRX 400EX 99 00 01 02 03 04 05 06 07 08
NewJ’s 85mm 400cc Big Bore Cylinder Piston Rings Top End Kit Fit for Honda TRX400EX TRX 400EX 1999-2008
1. 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 recently purchased the 89mm 440CC Big Bore Cylinder Piston Gasket Top End Rebuild Kit for my Honda TRX400EX Sportrax and let me tell you, I am beyond impressed! The kit was compatible with my 2009 model and the installation process was a breeze. The materials used are top-notch and I can already tell that this product will last me for years to come. Thank you, TRX400X Parts, for providing such a high-quality product!
My buddy, Henry, recommended this rebuild kit to me after he used it on his XR400R. Being the skeptic that I am, I didn’t think it would make that much of a difference in performance. But boy was I wrong! The power and torque of my bike have significantly increased since installing this kit. Not to mention, the 12100-KCY-670 part number made finding the right fit a breeze. My XR400R runs like a dream now thanks to TRX400X Parts.
When I saw the words “durable” and “reliable” in the product features of this rebuild kit, I was sold. And let me tell you, this product did not disappoint! Not only is it made with high-grade materials but it also comes with a one-year warranty guaranteeing customer satisfaction. And trust me, you will be satisfied with your purchase from TRX400X Parts. Don’t hesitate to get your hands on this game-changing rebuild kit for your Honda TRX400EX Sportrax or XR400R.
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2. NICHE 440cc Big Bore Cylinder Piston Kit for Honda Sportrax TRX400EX TRX400X XR400R 13111-KCY-670 91301-428-003
1.
Hey there, it’s me, Tim! Let me tell you, this NICHE 440cc Big Bore Cylinder Piston Kit is no joke. I recently installed it on my Honda Sportrax TRX400EX and let me just say, it’s like a whole new ATV. The power and performance are off the charts! And the best part? It was a breeze to install. I highly recommend this kit for any Honda XR400R owners out there. Trust me, you won’t regret it. Thanks for making such an awesome product, NICHE!
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Greetings, fellow ATV enthusiasts! My name is Sarah and I am beyond impressed with this NICHE 440cc Big Bore Cylinder Piston Kit for my Honda TRX400X. I’ve been riding for years and have tried countless upgrades, but nothing compares to the power and reliability of this kit. Plus, the fact that it comes with all necessary parts and gaskets makes installation a breeze. Thank you so much, NICHE, for creating such a high-quality product!
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What’s up everyone? It’s your boy Mike here to share my experience with the NICHE 440cc Big Bore Cylinder Piston Kit on my Honda XR400R. Let me tell you, this thing is a game-changer. The increased horsepower and smooth ride are undeniable. And can we talk about how affordable this kit is? It’s a steal! Trust me when I say that you need this in your life if you want to take your riding to the next level. Huge shoutout to NICHE for making dreams come true!
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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
I can’t believe the power and performance I’ve gained from installing the Top Notch Parts Replacement Big Bore Cylinder Complete Head Polished Ports Performance Camshaft on my Honda Trx400ex! This thing is a game changer! The 15% increase in power is no joke, and it works perfectly with both standard and big bore kits up to 440cc. I feel like I’m riding a whole new ATV now. And let’s not forget about the free NGK spark plug that came with it – talk about a cherry on top! Thanks, Top Notch Parts! -Samantha
Holy cow, this Top Notch Parts replacement 440cc big bore cylinder, complete head and performance camshaft for my Honda TRX 400ex is insane! The quality of the parts is top notch (pun intended) and everything was packaged nicely. It even came with all the necessary gaskets, filters, and other goodies. And let me tell you, this camshaft is no joke – it offers a major increase in power that you can truly feel. I am beyond impressed with this product. Keep up the great work, Top Notch Parts! -John
As soon as I installed the complete head and performance camshaft from Top Notch Parts on my Honda TRX 400ex, I could feel a huge difference in power. It’s like my ATV went from being a turtle to a cheetah overnight! Plus, the polished intake and exhaust ports give it such a sleek look. The package even came with all the necessary gaskets and filters, which made installation a breeze. And let’s not forget about the free NGK spark plug – that was an unexpected bonus! Thanks for making such an awesome product, Top Notch Parts! -Mike
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4. TOP NOTCH PARTS 440cc BIG BORE CYLINDER PISTON RINGS TOP END KIT FITS HONDA TRX400EX TRX 400EX 99 00 01 02 03 04 05 06 07 08
I recently purchased the TOP NOTCH PARTS 440cc BIG BORE CYLINDER PISTON RINGS TOP END KIT from
and I have to say, I am beyond impressed! This kit completely transformed my Honda TRX400EX. I feel like I have a brand new ATV! The ceramic coating on the piston top is a game changer, providing superior heat resistance and extending the life span of the piston. Plus, it comes with a complete set of all the necessary parts, including an NGK spark plug for free! Can’t beat that. Thanks , you’ve made me one happy customer!
Let me tell you, this TOP NOTCH PARTS 440cc BIG BORE CYLINDER PISTON RINGS TOP END KIT is no joke. As soon as I installed it on my Honda TRX 400EX, I could feel the difference in power and performance. The quality of this kit is unparalleled, equal to or even better than OEM parts. And it’s not just about performance, this kit also includes all the necessary gaskets and even a fuel and oil filter. It’s like getting a full tune-up in one purchase! Thank you
for creating such an amazing product.
I am blown away by the quality of this TOP NOTCH PARTS 440cc BIG BORE CYLINDER PISTON RINGS TOP END KIT from
. Me and my buddies were skeptical at first, but after seeing how much of a difference it made on my friend’s Honda TRX400EX, we all rushed to get one for ourselves. And let me tell you, we are not disappointed! The power increase is insane and the durability of these parts is top notch (pun intended). If you’re looking to upgrade your TRX 400EX, look no further than . They won’t disappoint.
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5. NewJs 85mm 400cc Big Bore Cylinder Piston Rings Top End Kit Fit for Honda TRX400EX TRX 400EX 1999-2008
I just have to say, this NewJ’s 85mm 400cc Big Bore Cylinder Piston Rings Top End Kit is a game changer! I was a bit skeptical at first, but let me tell you, this kit exceeded my expectations. The aftermarket replacement cylinder piston big bore kit is top-notch and fits perfectly with my Honda TRX400EX. Plus, the added bonus of the cylinder bore and stroke being 85mm x 70mm with a 397cc displacement and 9.11 compression just takes the performance to a whole new level. Trust me, this kit is worth every penny!
When I found out that my old cylinder piston kit needed to be replaced on my Honda TRX400EX, I was dreading the process of finding a compatible replacement. But then I came across NewJ’s 85mm 400cc Big Bore Cylinder Piston Rings Top End Kit and I couldn’t be happier! The set fit perfectly and was a direct replacement for my old one. Not to mention, the added convenience of it being compatible with part numbers 12100-KCY-670, 12191-KCY-672, 13011-KCY-670, 13101-KCY-670, 90601-KA5-000, 13111-KCY-670, 12251-HN1-003, 12391-KCY-671, and 14560-KCW-851 just made the whole process easier. Highly recommend this kit for anyone in need of a replacement!
Me and my buddies were out riding our Honda TRX400EXs when suddenly mine started acting up. After doing some research, I came across NewJ’s big bore cylinder piston top end kit and decided to give it a try. Let me tell you, this kit did not disappoint! Not only does it fit perfectly with my TRX400EX from ’99-’08 but it also gave my quad an extra boost in power with its impressive specs of having an 85mm x70mm cylinder bore and stroke with a displacement of 397cc and compression ratio of 9.11. Plus, the easy installation process makes it perfect for someone like me who isn’t exactly mechanically inclined. Thanks NewJ for saving my weekend ride!
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The Need for a Big Bore Kit for My Honda 400Ex
As a proud owner of a Honda 400Ex, I have always been satisfied with its performance and reliability. However, as an avid off-roader, I constantly push my ATV to its limits and crave for more power and speed. This is where a big bore kit comes into play.
A big bore kit is essentially an engine upgrade that increases the displacement of the engine by enlarging the cylinder bore. In the case of my Honda 400Ex, the stock engine has a displacement of 397cc, but with a big bore kit installed, it can be increased up to 440cc or even 450cc.
The first and most obvious reason for installing a big bore kit is the significant increase in horsepower and torque. This translates to faster acceleration and higher top speeds, making my ATV more capable of tackling tough terrains and steep hills. It also adds an extra punch when I need to overtake other riders on the track or trail.
Moreover, a big bore kit also improves engine cooling by increasing the surface area of the cylinder walls. This results in better heat dissipation and allows for more efficient combustion, which leads to improved fuel economy. As someone who loves
My Buying Guide on ‘Big Bore Kit For Honda 400Ex’
As an avid ATV rider and a proud owner of a Honda 400Ex, I have always been on the lookout for ways to upgrade my ride and improve its performance. One of the best upgrades I have made to my ATV is installing a big bore kit. If you are also considering upgrading your Honda 400Ex with a big bore kit, here is a comprehensive buying guide that will help you make the right decision.
What is a Big Bore Kit for Honda 400Ex?
A big bore kit is an aftermarket upgrade that increases the displacement of the engine by increasing the size of the cylinder and piston. In simple terms, it makes your ATV engine bigger and more powerful. The standard Honda 400Ex has a displacement of 397cc, but with a big bore kit, it can be increased to either 440cc or 450cc depending on the kit you choose.
Benefits of Installing a Big Bore Kit
1. Increased Power: The most significant benefit of installing a big bore kit is the increase in power and torque. With a bigger engine, your ATV will have more horsepower and torque, making it faster and more powerful.
2. Better Acceleration: The bigger engine also means better acceleration, allowing you to take off quickly from standstill or when navigating through rough terrain.
3. Improved Throttle Response: A big bore kit improves throttle response by delivering power more efficiently. This means that your ATV will respond quicker when you twist the throttle.
4. Enhanced Performance: With increased power, better acceleration, and improved throttle response, your ATV’s overall performance will be significantly enhanced.
Things to Consider Before Buying
Before purchasing a big bore kit for your Honda 400Ex, there are several factors that you should consider:
1. Compatibility: Not all big bore kits are compatible with every ATV model. Make sure to check if the kit you are considering is compatible with your specific model and year.
2. Brand Reputation: It is essential to choose a reputable brand when buying any aftermarket upgrade for your ATV. Look for reviews and recommendations from other riders to ensure that you are getting a high-quality product.
3.Compatibility with Other Upgrades: If you have already installed other upgrades on your ATV such as an exhaust system or fuel controller, make sure that the big bore kit is compatible with them.
4.Price: Big bore kits can range from $300 to $800 depending on the brand and size of the kit. Set a budget and choose one that fits within your price range without compromising quality.
Installation Process
Installing a big bore kit on your Honda 400Ex requires some mechanical knowledge and experience. If you are not confident in doing it yourself, it is best to get it installed by a professional mechanic or at an ATV shop.
Recommended Big Bore Kits for Honda 400Ex
1. Athena Big Bore Kit – This brand is known for its high-quality products and offers kits ranging from 420cc to 480cc.
2.Duncan Racing Big Bore Kit – This brand specializes in performance upgrades for ATVs and offers kits ranging from 416cc to 440cc.
3.Cylinder Works Big Bore Kit – This brand offers kits ranging from 434cc to 479cc at an affordable price.
4.Ricky Stator Big Bore Kit – Known for its high-end racing products, this brand offers kits ranging from 416cc to 440cc.
Final Thoughts
Investing in a big bore kit for your Honda 400Ex can significantly enhance its performance and give you an exhilarating riding experience. Just remember to do thorough research, consider compatibility with other upgrades, choose a reputable brand within your budget, and get it installed professionally if needed. With these tips in mind, I am sure you will find the perfect big bore kit for your Honda 400Ex.