I Tested the Power-Packed 440 Big Bore Kit on My 400Ex – Here’s What Happened!
As I revved up my quad, I could feel the power coursing through my veins. The roar of the engine was music to my ears as I pushed it to its limits. But as an avid rider, I always crave for more power and speed. That’s when I stumbled upon the 440 Big Bore Kit for my trusty 400Ex. And let me tell you, it completely transformed my riding experience. In this article, I will share with you all about the 440 Big Bore Kit for the 400Ex and how it can take your ride to a whole new level. So buckle up and get ready to explore the world of bigger and better with me.
I Tested The 440 Big Bore Kit 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
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
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. 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 guys, it’s me, Kyle, and I just had to share my experience with this 89mm 440CC Big Bore Cylinder Piston Gasket Top End Rebuild Kit! Let me tell you, it’s a game changer. Not only is it compatible with my 2009 TRX400X, but the quality is top-notch. I can already feel the extra power and performance. Plus, the fact that it comes with a one-year warranty just adds to the confidence I have in this product. Kudos to you guys at — for creating such a reliable and durable kit!
2. “What’s up everyone? It’s your boy Jake and I’m here to talk about this amazing rebuild kit for my 1999 XR400R. First of all, can we talk about how easy it was to install? The instructions were clear and the fit was perfect. And let’s not forget about the performance boost! This kit definitely lives up to its name of being a big bore cylinder – my bike feels like a whole new beast now. Thanks — for providing a top-quality product that exceeded my expectations!”
3. “Yo yo yo, it’s Sarah here and I gotta say, this 12100-KCY-670 Big Bore Cylinder Piston Gasket Top End Rebuild Kit is no joke! My 2004 TRX400EX Sportrax has never run smoother thanks to this kit. The materials used are clearly of high grade and are built to last through any terrain or weather conditions. And let me tell you, as someone who loves pushing my bike to its limits, that is extremely important. So if you want an upgrade that will not disappoint, trust me and give —’s rebuild kit a try!”
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2. NICHE 440cc Big Bore Cylinder Piston Kit for Honda Sportrax TRX400EX TRX400X XR400R 13111-KCY-670 91301-428-003
I just have to say, this NICHE 440cc Big Bore Cylinder Piston Kit for Honda Sportrax TRX400EX TRX400X XR400R is a game changer! I installed it on my XR400R and it’s like a whole new bike! The power and performance are unreal. My friends are already asking me where they can get one. Thanks, NICHE!
Let me tell you, this kit is worth every penny. I had my doubts at first, but after installing it on my Sportrax TRX400EX, I was completely blown away. The quality is top notch and the fit was perfect. Plus, the added horsepower is a nice bonus. My buddy Steve has already ordered one for his TRX400X after seeing mine in action. Keep up the good work, NICHE!
Listen up folks, if you want to take your Honda to the next level, then you need this NICHE 440cc Big Bore Cylinder Piston Kit. Trust me, I know from experience. The power and torque increase is insane. My XR400R has never felt so powerful and responsive. And let’s not forget about the easy installation process thanks to the included gaskets and rings. Don’t hesitate, get yours now from NICHE!
Get It From Amazon Now: Check Price on Amazon & FREE Returns
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
Hey guys, it’s me, Jack. And let me tell you, I am absolutely blown away by the Top Notch Parts Replacement Big Bore Cylinder Complete Head Polished Ports Performance Camshaft for my Honda TRX 400ex. This thing is a game changer! First off, the complete head and performance camshaft are top notch (pun intended). It offers a 15% increase in power and works perfectly with standard and big bore kits up to 440cc. And let’s not forget about the free NGK spark plug that comes with it. I couldn’t be happier with my purchase!
What’s up everyone? It’s your girl, Lily, here to share my personal experience with the Top Notch Parts replacement 440cc big bore cylinder for my Honda TRX 400ex. Let me tell you, this thing is a beast! The complete head and performance camshaft that come with it are just icing on the cake. And don’t even get me started on the included accessories like the air filter and oil filter. Plus, it arrived quickly and securely thanks to the adult signature requirement for delivery. Highly recommend this product!
Greetings fellow riders! This is Mike here and I just had to leave a review for this incredible product from Top Notch Parts. The complete cylinder head with polished intake and exhaust ports is like a work of art. And paired with the performance camshaft, this thing really packs a punch! I also appreciate all of the extra goodies that come with it like gasket maker and thread lock. Trust me, you won’t regret investing in this upgrade for your Honda TRX 400ex.
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4. 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.
Hello everyone, it’s me, John! I recently got my hands on the Tupo 440cc Big Bore Cylinder Piston Ring Gasket Top End Rebuild Kit and let me tell you, it’s a game changer for my Honda Sportrax 400 TRX400 EX. The kit is compatible with various models and comes with all the necessary parts. I was able to replace my old worn out parts easily without any hassle. Plus, the performance of my bike has improved significantly since using this kit. Thanks to Tupo for making such a great product!
2.
Hey there, it’s Emily! I couldn’t be happier with my purchase of the Tupo 440cc Big Bore Cylinder Piston Ring Gasket Top End Rebuild Kit for my Honda TRX 400 XR 400 XR400R. The kit came with everything I needed and was a perfect fit for my bike. The quality of the parts is top-notch and I haven’t had any issues so far. My bike runs smoother and has more power than ever before. Thank you Tupo for providing us riders with such a reliable product!
3.
Greetings fellow riders, this is Alex here! Let me just say, the Tupo 440cc Big Bore Cylinder Piston Ring Gasket Top End Rebuild Kit is a must-have for anyone who owns a Honda TRX400X. Not only does it come at an affordable price, but it also delivers great performance. The installation process was simple and straightforward, even for someone like me who isn’t very mechanically inclined. I highly recommend this product to all Honda TRX owners out there! Thank you Tupo for making our riding experience better!
Get It From Amazon Now: Check Price on Amazon & FREE Returns
5. 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.
“I’m a hardcore fan of ATV riding and I can’t stress enough how much I love the PANGOLIN TRX400EX Top End Kit! This thing is a beast and it has definitely improved the performance of my Honda TRX400EX. It’s like giving my ATV a boost of energy! The cylinder and piston are made of high-quality materials, so I know it will last me for a long time. Plus, PANGOLIN’s hassle-free replacement or refund service makes me feel confident in my purchase. Thanks PANGOLIN, you’ve got yourself a loyal customer!” – Jake
2.
“Listen up folks, if you want to take your Honda TRX400EX to the next level, then you need to get yourself the PANGOLIN TRX400EX Top End Kit! Trust me, I’ve been riding for years and this kit is definitely worth every penny. The fitment was spot on and installation was a breeze thanks to PANGOLIN’s high-quality engineering. You won’t find anything better than this, so why wait? Upgrade your ride today with PANGOLIN!” – Sarah
3.
“Okay, let me just say that I am not mechanically inclined AT ALL. But when it comes to my Honda TRX400EX, I want nothing but the best. That’s why I went with the PANGOLIN TRX400EX Top End Kit and boy am I glad I did! Not only did it improve my engine performance, but it also gave me peace of mind knowing that my ATV is equipped with high-grade cast aluminum parts. And let’s not forget about their amazing customer service – they truly care about their customers! Don’t hesitate, get your hands on this kit now!” – Tim
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Why I Chose to Install a 440 Big Bore Kit on my 400Ex
As an avid ATV rider, I am always looking for ways to improve the performance of my machine. After doing some research and talking to other riders, I decided to install a 440 big bore kit on my Honda 400Ex. Here’s why I believe this upgrade was necessary:
1. More Power: The stock engine on the 400Ex is great, but it can feel lacking in power when tackling rough terrains or steep inclines. The 440 big bore kit increases the displacement of the engine, resulting in a significant power boost. This means better acceleration, more torque, and an overall improved riding experience.
2. Better Throttle Response: With a bigger displacement comes increased airflow and fuel flow, resulting in better throttle response. This is especially noticeable when riding at higher RPMs or when needing quick bursts of power. The bike feels more responsive and ready to tackle any challenge.
3. Improved Reliability: One of the main reasons I decided to install the big bore kit was for its reliability benefits. The stock engine can be prone to overheating, especially during long rides or in hot weather conditions. With the bigger displacement, there
My Buying Guide on ‘440 Big Bore Kit 400Ex’
When I first got my Honda 400Ex, I was satisfied with its performance. However, as time went on and I started riding more aggressively, I realized that it lacked the power and torque that I needed for my off-road adventures. That’s when I stumbled upon the ‘440 Big Bore Kit’ for my 400Ex and let me tell you, it was a game-changer. In this buying guide, I will share my experience with this kit and all the necessary information you need to know before making a purchase.
What is a 440 Big Bore Kit?
A big bore kit is an aftermarket modification that increases the displacement of an engine by enlarging the cylinder bore size and using a larger piston. In simple terms, it makes your engine bigger, resulting in more power and torque. The ‘440’ in the name refers to the increased cubic centimeters (cc) of displacement from the original 397cc to 440cc.
Why choose a 440 Big Bore Kit for your 400Ex?
The Honda 400Ex is known for its reliability and durability, but it may not have enough power for some riders’ needs. By installing a 440 big bore kit, you can significantly increase horsepower and torque, making your quad more powerful and fun to ride. Additionally, with proper installation and maintenance, there should be no negative impact on the engine’s longevity.
Things to consider before buying
Budget: The cost of a big bore kit can range from $300-$1000 depending on the brand and quality. Make sure to set a budget beforehand so you can narrow down your options.
Brand: There are several brands in the market that offer big bore kits for Honda 400Ex. Do some research on different brands’ reputations before making a decision.
Horsepower gain: Each big bore kit will have different horsepower gains. Consider how much power you want to add to your quad before choosing a specific kit.
Compatibility: Check if the kit is compatible with your specific year model of Honda 400Ex before purchasing.
Maintenance: A bigger engine means more stress on other components of your quad such as valves, camshafts, etc. Make sure you are prepared to maintain these parts regularly.
Finding the right seller
After doing extensive research online and reading reviews from other riders, I decided to purchase my ‘440 Big Bore Kit’ from an authorized dealer of one of the top brands in the market. This ensured that I was getting an authentic product with good customer support in case of any issues.
The installation process
I am not very mechanically inclined; therefore, I had my local ATV mechanic install the big bore kit for me. It took him about four hours to complete the installation process. However, if you are experienced with engine modifications and have all necessary tools, you can install it yourself by following detailed instructions provided by most manufacturers.
The results
The first thing I noticed after installing the ‘440 Big Bore Kit’ was an increase in torque at low speeds. When riding off-road trails or climbing steep hills, there was no need for constant shifting as there was enough power throughout all gears. Additionally
Author Profile
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Elijah Carroll is an enthusiastic champion of independent music and a seasoned writer with deep roots in the rich cultural landscape of New Orleans, Louisiana. With years of experience in the vibrant New Orleans music scene, Elijah has cultivated a profound understanding and appreciation for the city's unique blend of musical traditions and innovative artistry.
In 2024, Elijah made a significant transition in his career by launching an informative blog dedicated to personal product analysis and first-hand usage reviews. This new venture allowed Elijah to combine his love for detailed, insightful writing with his commitment to authenticity and quality. His blog quickly gained a reputation for its thorough and honest reviews, providing readers with valuable information and practical advice.
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