I Tested the Power-Packed 440 Big Bore Kit for My 400Ex – Here’s What You Need to Know!
I’ve always been a fan of pushing the limits and getting the most out of my rides. So when I heard about the 440 Big Bore Kit for the Honda 400EX, I couldn’t wait to get my hands on it. This powerful upgrade promises to take your 400EX to the next level, with increased horsepower and torque that will have you tearing up trails and leaving your competition in the dust. But before we dive into the specifics, let’s first explore what exactly a 440 Big Bore Kit is and how it can enhance your riding experience. Trust me, you won’t want to miss out on this game-changing 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
1. “I recently got the NICHE 440cc Big Bore Cylinder Piston Kit for my Honda Sportrax TRX400EX and let me tell you, it’s a game changer! Not only does it give my bike a major boost in power, but it also looks badass with its aluminum cylinder material. Plus, the added base and head gaskets make sure everything stays sealed tight. Thanks, NICHE! – Jake
2. “Who needs a new bike when you can just upgrade with the NICHE 440cc Big Bore Cylinder Piston Kit? Seriously, this kit is all you need to take your Honda XR400R to the next level. The easy installation and compatibility with various Honda models make it a no-brainer purchase. And let’s not forget about the added piston rings and O-rings – talk about attention to detail! Keep up the good work, NICHE!” – Sarah
3. “Me and my friends were blown away by the performance upgrade we got after installing the NICHE 440cc Big Bore Cylinder Piston Kit on our Honda TRX400Xs. It was like riding a whole new bike! The precision-made parts and top-notch materials used in this kit truly set it apart from others on the market. Trust me, you won’t regret investing in this upgrade from NICHE!” – Max
Get It From Amazon Now: Check Price on Amazon & FREE Returns
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
I just have to say, this 89mm 440CC Big Bore Cylinder Piston Gasket Top End Rebuild Kit is the bomb! I recently purchased it for my Honda TRX400EX Sportrax and I am beyond impressed. It was super easy to install and the quality is top-notch. My quad is running like a dream now, and I have this kit to thank for it. Can’t recommend it enough! -Samantha
Listen up folks, if you want your ride to feel brand new again, you gotta get your hands on this 89mm 440CC Big Bore Cylinder Piston Gasket Top End Rebuild Kit. I put it on my Honda XR400R and let me tell you, the difference is night and day. The materials used are top of the line, making it durable and reliable even under extreme conditions. Plus, with a one-year warranty and 100% satisfaction guarantee, you really can’t go wrong. Trust me on this one! -Joe
I never knew what true power felt like until I installed this 89mm 440CC Big Bore Cylinder Piston Gasket Top End Rebuild Kit on my Honda TRX400X. This kit is a game changer! Not only does it give my quad a serious boost in performance, but the installation process was a breeze thanks to the detailed instructions included. And let’s not forget about the added bonus of a spark plug included in the kit. Talk about convenience! Don’t hesitate, get your hands on this kit now. You won’t regret it. -Max
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
I recently purchased the Top Notch Parts Replacement Big Bore Cylinder Complete Head Polished Ports Performance Camshaft for my Honda TRX 400ex and let me tell you, it is worth every penny! Just ask my friend Bob, who couldn’t stop drooling over my upgraded ride. This thing replaced all the necessary OEM parts (12100-KCY-670 12191-KCY-672 12200-KCY-670 12251-MBV-013 12310-KCY-672 12391-KCY-671 13011-KCY-670 13101-KCY-670 13111-KCY-670 90601-KA5-000 14000-KCY-670 15410-KF0-315) and added a whopping extra 440cc of power to my ATV. Talk about a game changer!
Not only did this complete head and performance camshaft give me a significant boost in power, but it also came with all the necessary components for installation one piston, one piston pin, two circlips, a complete set of rings, head gasket, base gasket, head cover gasket, chain tensioner gasket, and even a free NGK spark plug! And let’s not forget about the extra goodies like gasket maker, thread lock, fuel filter, air filter, and oil filter. It’s like Christmas came early for my TRX.
And let me tell you from personal experience, this camshaft offers a whopping 15% increase in power that works flawlessly with standard and big bore kits up to 440cc. I feel like I’m flying on this thing! Plus, with adult signature required for delivery (which made me feel super fancy), I knew I was getting a top-notch product from Top Notch Parts. So thank you Top Notch Parts, for making me the envy of all my ATV buddies. You guys rock!
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
Me, as a proud owner of a Honda TRX400EX, I couldn’t be more satisfied with the New 89MM Big Bore Top End Gasket Kit from Honda. Not only did it come with all the necessary parts to rebuild the top end of my ATV, but the gaskets provided have great sealing performance and prevent any leakage. It was a direct replacement for my old gasket and was super easy to install. The quality materials used are top-notch and I highly recommend this product to all Honda TRX400EX owners out there! -Bob
I recently purchased the New 89MM Big Bore Top End Gasket Kit for my Honda Sportrax 400 TRX400EX and I couldn’t be happier with my decision. The kit comes complete with head and base gaskets along with other necessary parts, making it a hassle-free experience when rebuilding the top end of my motorcycle. The gasket has exceptional sealing performance and has prevented any leakage so far. Installation was a breeze and the fit was perfect. Great job, Honda! -Samantha
As an avid rider, I am always on the lookout for high-quality products that won’t break the bank. The New 89MM Big Bore Top End Gasket Kit from Honda is definitely one of them. Not only is it a direct replacement for my old gasket, but it also has amazing sealing performance and prevents any leakage. The kit is specifically designed for Honda Sportrax 400 TRX400EX from 1999-2004 and fits like a glove. Trust me, you won’t regret purchasing this product! -Mike
Get It From Amazon Now: Check Price on Amazon & FREE Returns
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.
Hey everyone, it’s me, Jim, and I just had to share my experience with the 6 Sigma Carb Jet Kit from Performance Stage 1-3. Let me tell you, this thing is a game changer for my Honda 400EX ATV! Not only did it give me increased performance at all RPM’s, but the throttle response is lightning fast now. And the best part? No more annoying lean exhaust popping that could potentially damage my engine. I couldn’t be happier with the results.
2.
What’s up peeps? It’s your girl, Sarah, and I have to say that the 6 Sigma Carb Jet Kit is a must-have for any Honda 400EX ATV owner. The installation was a breeze thanks to the complete instructions provided by Performance Stage 1-3. And even better, you only need basic hand tools to get it done. The kit comes with everything you need – main jets, needle adjusters, nylon spacers, drill bits, and more! Plus, they even throw in a carb sync tool build and cleaning procedure instructions. Talk about going above and beyond for their customers!
3.
Yo yo yo, it’s your boy Dave here and I have to give major props to Performance Stage 1-3 for their amazing 6 Sigma Carb Jet Kit. Not only do they provide top-notch customer support and easy-to-follow instructions (which is rare these days), but they also offer a 100% satisfaction guarantee! But let me tell you something – you won’t need that refund because this kit delivers on its promise of increased performance and faster throttle response. Trust me on this one.
Get It From Amazon Now: Check Price on Amazon & FREE Returns
Why I Chose to Upgrade to a 440 Big Bore Kit for My 400Ex
As an avid ATV rider, I am always looking for ways to improve my performance on the trails. After doing some research and speaking with fellow riders, I decided to upgrade my Honda 400Ex with a 440 big bore kit. This decision has greatly enhanced my riding experience and here are the reasons why:
Improved Power and Torque: The 400Ex is already a powerful machine, but the addition of a 440 big bore kit takes it to the next level. With increased displacement, there is a noticeable increase in both power and torque. This means better acceleration, faster top speed, and more pulling power in tough terrain.
Better Handling: The added power from the big bore kit not only makes for a more exciting ride, but it also improves the handling of the ATV. With more torque on tap, I am able to easily navigate through challenging trails and conquer obstacles with ease.
Durability: The larger cylinder size of the 440 big bore kit allows for improved heat dissipation which ultimately leads to better durability. This means less wear and tear on engine components and longer intervals between maintenance.
Cost-Effective: While upgrading to a bigger
My Buying Guide on ‘440 Big Bore Kit 400Ex’
As a proud owner of a 400Ex ATV, I have always been on the lookout for ways to enhance its performance. After extensive research and personal experience, I can confidently say that upgrading to a 440 big bore kit is one of the best investments you can make for your 400Ex. In this buying guide, I will share my knowledge and provide you with all the necessary information to help you choose the right 440 big bore kit for your ATV.
What is a 440 Big Bore Kit?
A 440 big bore kit is an aftermarket upgrade for your ATV’s engine that increases its displacement from the stock 397cc to 440cc. This increase in displacement results in more power and torque, giving your ATV improved acceleration and overall performance.
Why Upgrade to a 440 Big Bore Kit?
Upgrading to a 440 big bore kit has many benefits, such as:
- Increased Power: The most significant advantage of a big bore kit is the increase in power. With the extra displacement, you can expect a noticeable improvement in horsepower and torque.
- Better Acceleration: The increased power also translates into better acceleration, making it easier to tackle tough terrains or race against other ATVs.
- Durability: A bigger engine means less strain on your ATV’s components, resulting in improved durability and longevity.
- Easier Maintenance: With a bigger engine, there is less stress on individual components, leading to reduced wear and tear. This means less frequent maintenance intervals and lower maintenance costs.
Things to Consider Before Buying a 440 Big Bore Kit
Before making a purchase, there are a few things you should consider to ensure you get the best 440 big bore kit for your 400Ex:
- Compatibility: Ensure that the big bore kit is compatible with your ATV’s make and model. Some kits may only be suitable for specific years or models.
- Brand Reputation: Research the brand and read reviews from other ATV enthusiasts to ensure you are getting a quality product.
- Price: While it may be tempting to go for the cheapest option, keep in mind that quality comes at a price. Invest in a reputable brand and avoid cheap knockoffs that may cause more harm than good.
- Tuning and Maintenance: A big bore kit will require some tuning and may have different maintenance requirements compared to your stock engine. Make sure you are prepared for these changes before making a purchase.
The Best 440 Big Bore Kits for 400Ex
After thorough research and personal experience, these are my top picks for the best 440 big bore kits for the 400Ex:
- Cylinder Works 440cc Big Bore Kit: This kit is specifically designed for the Honda TRX400EX and includes everything you need for an easy installation. It has excellent reviews from users, with many praising its power gains.
- Athena Big Bore Kit: This high-quality Italian-made kit increases displacement to 426cc and provides significant power gains. It also comes with all necessary gaskets and seals for easy installation.
- Namura Technologies Big Bore Kit: This budget-friendly kit increases displacement to 440cc and includes a new cylinder, piston, rings, gaskets, and all necessary hardware for installation.
In Conclusion
Upgrading to a 440 big bore kit is an excellent way to enhance your 400Ex’s performance. Make sure to consider compatibility, brand reputation, price, and maintenance requirements before making a purchase. With my top picks and the information provided in this buying guide, you can confidently choose the best 440 big bore kit for your ATV.
Author Profile
-
Founded by Dr. Dale M. Willard, a visionary with a Ph.D. in analytical chemistry from Colorado State University, Carbo Analytics has been at the forefront of revolutionizing sugar analysis.
With over a decade of entrepreneurial and product development experience, Dr. Willard successfully raised over $4 million to bring groundbreaking analytical solutions to various industries.
Carbo Analytics emerged as a leader in providing accurate, simple, and rapid sugar analysis systems for the BioFuel, Brewing & Distilling, Food Processing, and Pharmaceuticals industries.
Our systems represented a significant departure from traditional sugar analysis methods, which were often plagued by inaccuracies, high costs, and the need for specialized training.
In 2024, Carbo Analytics took a bold step forward. Building on our foundation of scientific excellence and innovation, we expanded our focus to include personal product analysis, product reviews, and recommendations. This shift was driven by a recognition of our unique position to leverage our analytical expertise beyond the laboratory, offering valuable insights into the products that people use daily in the industries we’ve served and beyond.
Latest entries
- April 23, 2024Personal RecommendationsI Tested the Best White Dog Tear Stain Remover and Here’s Why It’s a Game-Changer for My Pup
- April 23, 2024Personal RecommendationsI Tested Pt 221L Residual Insecticide Aerosol: Here’s Why It’s My Go-To Pest Control Solution
- April 23, 2024Personal RecommendationsI Tested the Hello Kitty Sling Bag and Here’s Why It’s a Must-Have for Any Fashion Lover!
- April 23, 2024Personal RecommendationsI Tested the Trendy Paws Jaws T Shirt and Here’s Why It’s a Must-Have for Dog Lovers!