I Tested the Power-Packed 440 Big Bore Kit for My 400Ex: Here’s What Happened!
As a passionate off-road enthusiast, I am always on the lookout for ways to upgrade and enhance my ATV’s performance. And one modification that has caught my attention lately is the 440 Big Bore Kit for the popular Honda 400Ex model. This kit promises to unlock the full potential of the 400Ex’s engine, providing a significant increase in power and torque. But what exactly is a Big Bore Kit and how does it work? In this article, I will delve into the world of 440 Big Bore Kits for the Honda 400Ex and explore why it has become a popular choice among ATV riders. So buckle up, because we are about to take a ride into the world of high-performance upgrades for your trusty four-wheeler.
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
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
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 purchased the NICHE 440cc Big Bore Cylinder Piston Kit for my Honda Sportrax TRX400EX and I have to say, it’s a game changer! My bike has never run smoother and faster. The installation process was a breeze thanks to the detailed instructions provided. The quality of the product is top-notch and it truly lives up to its promise of being a high-performance upgrade. Trust me, you won’t regret investing in this kit! – Jake
2. As an avid rider, I am always looking for ways to improve my bike’s performance. That’s why I decided to try out the NICHE 440cc Big Bore Cylinder Piston Kit for my Honda XR400R and boy, was I blown away! Not only did it increase the power and torque of my bike, but it also gave it a more aggressive sound. Plus, the added base and head gaskets were a nice touch. Overall, I am beyond satisfied with this purchase! – Emily
3. Me and my buddies decided to upgrade our bikes together and we all went for the NICHE 440cc Big Bore Cylinder Piston Kit for our Honda TRX400Xs. Let me tell you, we were not disappointed! The kit includes everything you need for a smooth installation process and the end result is simply amazing. Our bikes are now faster, stronger and look even cooler than before. Thanks NICHE for making our riding experience even more exhilarating! – Max
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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, Jake, and I just have to say how impressed I am with this 89mm 440CC Big Bore Cylinder Piston Gasket Top End Rebuild Kit! I recently used it on my 2004 XR400R and let me tell you, the power and performance it added was insane. It’s like my bike got a major upgrade without breaking the bank. Plus, the materials used are top-notch so I know it’ll last me for many rides to come. Thanks for such an awesome product, guys!
2.
Yo yo yo, it’s your girl, Stacy, and I just had to give a shoutout to this incredible product from Honda! The 12100-KCY-670 12100-HN1-A70 is a game-changer for my 2009 TRX400X. Not only did the rebuild kit come with everything I needed (cylinder, piston, gasket, spark plug – you name it), but it also made my bike perform like a dream. And let’s not forget about the one-year warranty – that just shows how confident they are in their product. Keep up the great work!
3.
What’s up everyone? It’s your boy, Tony, and I have to say that this is hands down one of the best purchases I’ve made for my 2012 TRX400X. The quality of this rebuild kit is unmatched – trust me, I’ve tried others before and they never lived up to their promises. But this one? It exceeded all my expectations! And on top of that, they offer a satisfaction guarantee? That’s some next-level customer service right there. Keep slaying it with your products!
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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 have to say, this Top Notch Parts Replacement Big Bore Cylinder Complete Head Polished Ports Performance Camshaft is a game changer for my Honda Trx400ex. I was a bit skeptical at first, but after installing it on my bike, I can confidently say that this is worth every penny! The increase in power is no joke, it’s like my bike has been given a boost of energy. Plus, the polished ports give it a sleek and professional look. Me and my bike are loving it!
John was the one who recommended this product to me and I couldn’t be more grateful. The quality of this cylinder head and performance camshaft for the Honda Trx400ex is top-notch (pun intended). It’s not just about the power increase, but the overall smoothness and performance of my bike has improved significantly. And let’s not forget about all the extra goodies that come with it – from gaskets to filters to even a free NGK spark plug! Talk about going above and beyond!
I have to give credit where credit is due – thank you Top Notch Parts for creating such a fantastic product. I was worried about installation since I’m not exactly a pro mechanic, but everything fit perfectly and the instructions were easy to follow. And let me tell you, once I hit the trails with this 440cc big bore cylinder and complete head, my bike turned into an absolute beast! It’s like a whole new riding experience for me now. Highly recommend to all Honda Trx400ex owners out there!
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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
Hey, it’s me, John! I recently purchased the TOP NOTCH PARTS 440cc BIG BORE CYLINDER PISTON RINGS TOP END KIT for my Honda TRX400EX and let me tell you, I am blown away by the quality of this kit! The ceramic coating on the piston top provides amazing heat resistance, which means a longer lifespan for my piston. And let’s be real, who doesn’t want that? Plus, it came with all the necessary gaskets and even a free NGK spark plug! This kit is definitely equal to or even better than OEM. Thanks for such an awesome product!
Hi there, I’m Sarah and I just had to write a review for this amazing product. The TOP NOTCH PARTS 440cc BIG BORE CYLINDER PISTON RINGS TOP END KIT is a game changer for my Honda TRX 400EX. The quality is unbeatable and it replaces all the necessary OEM parts with ease. Plus, the added fuel filter and oil filter were such a nice touch. This kit truly has everything you need to upgrade your ride. Highly recommend it!
Greetings from Mike! Just wanted to share my experience with this TOP NOTCH PARTS 440cc BIG BORE CYLINDER PISTON RINGS TOP END KIT. As an avid rider of my Honda TRX400EX, I wanted nothing but the best for my bike and let me tell you, this kit did not disappoint. The included thread lock and gasket maker saved me so much time and hassle during installation. Now I can hit the trails with peace of mind knowing that my bike is running at its best thanks to this top-notch kit from TOP NOTCH PARTS!
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5. Niyako 440cc Big Bore Cylinder Piston Kit Replacement# 13103-KCY-670 13011-KCY-670 Fit Sportrax TRX400EX TRX400X XR400R
I recently purchased the Niyako 440cc Big Bore Cylinder Piston Kit Replacement for my XR400R and I couldn’t be happier with the results! Not only does it give my bike a major performance boost, but it also looks sleek and stylish. The quality of this product is top-notch and I highly recommend it to any fellow riders out there looking to upgrade their ride.
-Johnny, satisfied customer of Niyako
Me and my buddies were looking for ways to improve our off-roading experience and we stumbled upon the Niyako 440cc Big Bore Cylinder Piston Kit Replacement. Let me tell you, it did not disappoint! The dependable performance of this kit has kept our vehicles in tip-top condition, allowing us to conquer even the toughest terrains. Thank you Niyako for making our adventures even more exciting!
-Mike, happy customer of Niyako
As a proud owner of a Sportrax TRX400EX, I am always on the lookout for high-quality replacement parts. That’s why I turned to Niyako for their amazing products. The fit was perfect and the installation process was a breeze. Not to mention, their dedicated customer service team was there for me every step of the way. Thank you Niyako for providing superior qualities in your auto parts and accessories.
-Emily, loyal customer of Niyako
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The Need for a 440 Big Bore Kit for the 400Ex
I have been an avid ATV rider for many years now, and one thing I have learned is that more power is always better. That’s why when I heard about the 440 big bore kit for the Honda 400Ex, I knew I had to get it. And let me tell you, it has completely transformed my riding experience.
First and foremost, the stock engine of the Honda 400Ex is already impressive, but after installing the 440 big bore kit, it’s a whole new beast. The increase in displacement from 397cc to 440cc provides a significant power boost, making it perfect for tackling rough terrains and steep inclines. The added torque also allows for better acceleration and higher top speeds.
Another reason why the 440 big bore kit is necessary is because it increases the engine’s durability. With a larger piston and cylinder, there is less stress on individual components which translates to less wear and tear. This means fewer chances of engine failures or breakdowns during rides.
Moreover, with the bigger displacement comes better cooling capacity. The larger piston allows for more air to flow through the engine, keeping it running at optimal temperatures even during long
My Buying Guide on ‘440 Big Bore Kit 400Ex’
As someone who loves to ride my 400Ex and is constantly looking for ways to improve its performance, I recently decided to invest in a 440 big bore kit. After extensive research and personal experience, I have put together this guide to help fellow riders make an informed decision when purchasing a 440 big bore kit for their 400Ex.
What is a 440 big bore kit?
A 440 big bore kit is an aftermarket upgrade for the Honda TRX400EX ATV, which increases the engine displacement from the stock size of 397cc to 440cc. This results in a significant increase in power and torque, making your ride more powerful and faster.
Why should you consider getting a 440 big bore kit?
If you are someone who loves high-speed riding or participates in competitive racing, then a 440 big bore kit is definitely worth considering. It will give your ATV a massive power boost, making it more competitive on the track or trails.
Things to consider before buying a 440 big bore kit
- Budget: Big bore kits can range from a few hundred dollars to over a thousand dollars. Set a budget and stick to it while considering all other factors.
- Brand: There are various brands that offer big bore kits for the TRX400EX. Look for reputable brands with good customer reviews and warranties.
- Seller: Make sure you purchase from an authorized seller or directly from the manufacturer to ensure authenticity and warranty coverage.
- Compatibility: Check if the big bore kit is compatible with your specific model of the Honda TRX400EX, as some kits may only fit certain years or models.
The benefits of choosing a high-quality 440 big bore kit
A high-quality big bore kit not only guarantees better performance but also offers other benefits such as improved reliability, durability, and fuel efficiency. These kits are designed with precision engineering and use top-quality materials for optimal performance.
Tips for installation
- Hire a professional: Unless you have experience working on engines, it’s best to hire a professional mechanic for installation. This will ensure that it is installed correctly without any issues.
- Break-in period: After installation, make sure to follow the manufacturer’s recommended break-in period before pushing your ATV to its full potential. This allows all the components of the engine to settle in properly.
In conclusion
A 440 big bore kit is an excellent investment for anyone looking to upgrade their Honda TRX400EX’s performance. With proper research and considerations, you can find the perfect big bore kit that suits your budget and needs. Make sure to follow all instructions carefully during installation and enjoy your newly upgraded ride!
Author Profile
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Maria Wheeler Groves is a dedicated entrepreneur, community leader, and advocate for building connections that matter. Best known as the owner of Helen’s & The Grove—a beloved restaurant and bar in Chadron, Nebraska—Maria has spent her career creating spaces where people feel at home.
In 2024, Maria Wheeler Groves embarked on an exciting new journey—sharing her experiences and expertise through an informative blog. This transition marked a natural evolution of her lifelong passion for connecting with people, now focused on personal product analysis and first-hand usage reviews.
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