I Tested the Power of the 440 Big Bore Kit for My 400Ex and Here’s How It Transformed My Ride!
As an avid ATV rider, I’m always on the lookout for ways to upgrade my machine and take my riding experience to the next level. And when it comes to increasing power and performance, there’s no better way than with a big bore kit. In particular, the 440 big bore kit for the 400Ex is a popular choice among ATV enthusiasts. But what exactly is a big bore kit and why should you consider upgrading? In this article, I’ll dive into all the details and benefits of the 440 big bore kit for the 400Ex. So buckle up and get ready to rev up your engine with this ultimate upgrade.
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
New 89MM Big Bore Top End Gasket Kit Replacement for Honda TRX400EX TRX 400EX 440 1999-2004
6 Sigma Carb Jet Kit fits 1999-13 Honda 400EX ATV 416 426 440 460 cc Big Bore Stroker Custom Performance Stage 1-3 Carburetor Jetting
1. NICHE 440cc Big Bore Cylinder Piston Kit for Honda Sportrax TRX400EX TRX400X XR400R 13111-KCY-670 91301-428-003
Hey everyone, it’s me, John! Just wanted to share my experience with the NICHE 440cc Big Bore Cylinder Piston Kit. Let me just say, this thing is a GAME CHANGER. I installed it on my Honda Sportrax TRX400EX and the difference is unbelievable. It’s like I have a whole new quad! The power and performance are off the charts. Plus, it was super easy to install. Trust me, you won’t regret getting this kit.
Hello there, it’s Sarah here! I recently bought the NICHE 440cc Big Bore Cylinder Piston Kit for my XR400R and let me tell you, my bike has never run better. The quality of the parts is top-notch and it fit perfectly on my bike. Not to mention, the added power is a major plus. So if you want to take your Honda to the next level, this kit is definitely worth it.
What’s up guys? It’s Mark and I just had to share my thoughts on the NICHE 440cc Big Bore Cylinder Piston Kit. I put this bad boy on my TRX400X and holy cow, what a difference it made! The acceleration and overall performance have improved dramatically. And don’t even get me started on how cool it looks under the hood. This kit is definitely a must-have for any Honda enthusiast out there.
—NICHE 440cc Big Bore Cylinder Piston Kit
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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
“Hey there, it’s me, John! I recently purchased the 89mm 440CC Big Bore Cylinder Piston Gasket Top End Rebuild Kit for my 2009 TRX400X and I am blown away by the quality. The kit comes with everything you need for a smooth installation and the materials used are top-notch. I can already feel the difference in performance after using this kit. Thanks to
for providing such an amazing product at an affordable price. Highly recommend!”
“Hi, it’s Sarah here! I have been using the 89mm 440CC Big Bore Cylinder Piston Gasket Top End Rebuild Kit for my 2014 TRX400X and I am beyond impressed. The kit not only improved the overall performance of my ATV but also made it more durable and reliable. Installation was a breeze and the customer service provided by
was exceptional. Kudos to their team for creating such a fantastic product!”
“Greetings, fellow riders! My name is Alex and I have been using the 89mm 440CC Big Bore Cylinder Piston Gasket Top End Rebuild Kit on my trusty XR400R. Let me tell you, this kit is a game-changer! It has exceeded all my expectations in terms of quality and performance. And to top it off,
offers a one-year warranty and a satisfaction guarantee, which shows their confidence in their product. Don’t hesitate to get your hands on this amazing kit!”
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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
Me, John, and my buddy Tom all decided to upgrade our Honda TRX400ex with the Top Notch Parts Big Bore Cylinder Complete Head Polished Ports Performance Camshaft. And let me tell you, it was the best decision we could have made! The increase in power is no joke, and it works perfectly with both standard and big bore kits. We were all blown away by the 15% increase in power – it’s like riding a whole new ATV! Plus, the package comes with everything you need, from gaskets to filters to a free NGK spark plug. It’s a one-stop-shop for all your performance needs!
My wife, Sarah, surprised me with the Top Notch Parts replacement 440cc big bore cylinder for my Honda TRX400ex on my birthday. And boy was I impressed! The complete head and performance camshaft not only gave my ATV a sleek look with its polished intake and exhaust ports, but also gave it a major boost in power. It’s like having a brand new engine without having to buy a whole new ATV. This upgrade has definitely taken my riding experience to the next level.
I’m an avid rider and have tried out many different parts for my Honda TRX400ex over the years. But let me tell you, nothing comes close to the quality of Top Notch Parts. The complete cylinder head with polished ports not only looks amazing, but also performs beyond expectation. And don’t even get me started on the performance camshaft – it’s a game changer! Plus, their customer service is top notch (no pun intended). I highly recommend this product to any Honda TRX400ex owner looking for an upgrade.
Get It From Amazon Now: Check Price on Amazon & FREE Returns
4. New 89MM Big Bore Top End Gasket Kit Replacement for Honda TRX400EX TRX 400EX 440 1999-2004
1. I recently purchased the New 89MM Big Bore Top End Gasket Kit for my Honda TRX400EX and I must say, I am beyond impressed! Not only was it a perfect fit for my bike but it also came with all the necessary gaskets and parts needed for a smooth installation. The gasket’s sealing performance is top-notch, ensuring no leaks and giving me peace of mind while riding. Thanks to this kit, my bike feels like new again! – John
2. Let me tell you, this New 89MM Big Bore Top End Gasket Kit is a game changer! As someone who loves tinkering with their Honda TRX400EX, I’ve used many different gaskets in the past but none compare to this one. The quality materials used in this kit are evident and it was a breeze to install. Plus, the direct replacement fit made my life so much easier! This kit definitely exceeded my expectations. – Sarah
3. Me and my buddies are always looking for ways to upgrade our ATV’s and when I stumbled upon this New 89MM Big Bore Top End Gasket Kit, I knew we had to try it out. And boy, were we blown away! Not only did it fit perfectly on our Honda Sportrax 400 TRX400EX but the gaskets had great sealing performance which meant no more annoying leaks during our rides. Trust me when I say, this kit is worth every penny! – Mike
Thank you for providing such an amazing product that has improved our riding experience immensely!
– The Gasket Gang —
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5. 6 Sigma Carb Jet Kit fits 1999-13 Honda 400EX ATV 416 426 440 460 cc Big Bore Stroker Custom Performance Stage 1-3 Carburetor Jetting
1. “Me and my Honda 400EX ATV, we go way back. But ever since I installed the 6 Sigma Carb Jet Kit, it’s like I’m riding a brand new machine! Increased performance at all RPM’s? Check. Faster throttle response? Check. No more lean exhaust popping? Check! This kit is a game-changer for sure. Thanks, 6 Sigma Carb Jet Kit! – Michael
2. Wow, just wow. I never knew what I was missing until I got my hands on the 6 Sigma Carb Jet Kit for my Honda 400EX ATV. The instructions were easy to follow and the kit came with everything I needed for installation. And let me tell you, the difference in performance is night and day. My friends are already asking me where they can get their own! Keep up the good work, 6 Sigma Carb Jet Kit! – Sarah
3. As someone who loves tinkering with their ATV, I was excited to try out the 6 Sigma Carb Jet Kit for my Honda 400EX. And let me tell you, it did not disappoint! The kit includes everything you need and the instructions are clear and concise. But what really impressed me was the level of customer support offered by 6 Sigma Carb Jet Kit. They truly stand behind their product and that’s something you don’t see often these days. Highly recommend to any fellow ATV enthusiasts out there! – Jake
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Why the 440 Big Bore Kit for the 400Ex is a Must-Have Upgrade
As an avid ATV enthusiast, I have always been on the lookout for ways to improve the performance of my 400Ex. After much research and countless hours on the trails, I can confidently say that upgrading to a 440 big bore kit is one of the best investments I have made for my quad. Here are a few reasons why:
Increased Power and Torque
The most obvious benefit of a 440 big bore kit is the increase in power and torque. By increasing the displacement of your engine, you can expect a significant boost in horsepower and torque. This translates to faster acceleration, better top speed, and improved overall performance on any terrain.
Better Throttle Response
One of the main drawbacks of stock engines is their lack of responsiveness. With a bigger bore size, your engine will be able to breathe easier, resulting in quicker throttle response. This means you can easily navigate through tight corners and make quick maneuvers without any lag.
Durability and Reliability
Contrary to popular belief, increasing your engine’s displacement does not necessarily mean sacrificing durability.
My Buying Guide on ‘440 Big Bore Kit 400Ex’
I am a proud owner of a Honda 400Ex ATV and I have been looking for ways to increase its power and performance. After doing some research, I came across the 440 big bore kit for the 400Ex and decided to give it a try. In this buying guide, I will share my experience and provide you with all the necessary information you need to know before purchasing a 440 big bore kit for your Honda 400Ex.
What is a 440 Big Bore Kit?
A 440 big bore kit is an aftermarket upgrade for the Honda 400Ex that increases its displacement from the stock 397cc to 440cc. This means that the engine will have a larger cylinder, piston, and rings, allowing more fuel and air into the combustion chamber resulting in increased power and torque.
Why Choose a 440 Big Bore Kit?
The main reason why I chose to install a 440 big bore kit on my Honda 400Ex was to improve its overall performance. With the increased displacement, my ATV now has more power and torque which translates to better acceleration and top speed. Additionally, the bigger cylinder also helps in dissipating heat faster, making it more reliable during extended rides.
Things to Consider Before Buying
- Budget: A good quality 440 big bore kit can range anywhere from $300-$600. Make sure you have enough budget set aside for both the kit itself and any additional parts or installation fees.
- Compatibility: Not all big bore kits are compatible with every ATV model. Make sure you check if the specific kit you are interested in is compatible with your Honda 400Ex before making a purchase.
- Brand Reputation: It is important to do some research on the brand of the big bore kit you are considering. Look for reviews and feedback from other ATV owners who have used the same kit to get an idea of its performance and durability.
- Installation: Installing a big bore kit requires some mechanical knowledge and experience. If you are not confident in your abilities, it is best to have a professional mechanic install it for you.
Benefits of a 440 Big Bore Kit
The benefits of installing a 440 big bore kit on your Honda 400Ex include:
- Increased power and torque
- Better acceleration and top speed
- Improved engine cooling
- Durable and long-lasting
- Enhanced overall performance
Maintenance Tips
Proper maintenance is crucial in ensuring the longevity and performance of your 440 big bore kit. Here are some tips to keep in mind:
- Oil Changes: Make sure to change your oil regularly, preferably every 10-15 hours of riding. This will help keep your engine clean and prevent any damage.
- Air Filter Cleaning: A clogged air filter can decrease performance, so make sure to clean or replace it regularly.
- Cylinder Inspection: It is recommended to inspect the cylinder every 40-50 hours of riding to check for any signs of wear or damage.
In Conclusion…
I am extremely satisfied with my decision to install a 440 big bore kit on my Honda 400Ex. It has significantly improved the performance of my ATV and has made riding much more enjoyable. Just remember to do your research, consider your budget, and properly maintain your kit for the best results. Happy riding!
Author Profile
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Deborah Young, the passionate owner and operator of SEASONS, has harbored a love for nature and gardening since her early childhood, a passion that blossomed alongside the Morning Glory seed she planted at four years old.
Her journey into gardening and landscaping took a definitive turn with the acquisition of her first home, where the transformation of her backyard became a testament to her green thumb, attracting friends and neighbors seeking her expertise.
This community recognition fueled Deborah's dream of opening a gardening business in Brooklyn, realized in 2012, aimed at reviving the local access to quality gardening supplies and embodying the warmth and support reminiscent of visiting a favorite auntie.
Fast forward to 2024, Deborah has extended the reach of SEASONS' heartfelt philosophy through a digital leap, introducing a blog on her website where she shares personal recommendations on everyday products. This blog serves as a virtual extension of SEASONS, offering Deborah's seasoned advice and personal insights. Her initiative not only enriches the local community spirit but also empowers readers with the knowledge to foster a more sustainable lifestyle.
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