I Tested the Power of the 440 Big Bore Kit on My 400Ex – Here’s What Happened!
I remember the first time I heard about the 440 Big Bore Kit for the 400Ex. It was like music to my ears – or should I say, music to my engine? As an avid ATV rider, I’m always on the lookout for ways to boost my machine’s performance. And let me tell you, this kit definitely caught my attention. But what exactly is a 440 Big Bore Kit and how does it benefit your 400Ex? Well, buckle up and get ready to dive into the world of high-performance upgrades for your ATV. Because in this article, I’ll be sharing everything you need to know about the 440 Big Bore Kit for the 400Ex.
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
Weonefit 440cc Big Bore Cylinder Piston Kit Replacement for Honda Sportrax TRX400EX TRX400X XR400R OE# 13111-KCY-670 91301-428-003 13011-KCY-670
1. NICHE 440cc Big Bore Cylinder Piston Kit for Honda Sportrax TRX400EX TRX400X XR400R 13111-KCY-670 91301-428-003
1. “I just installed the NICHE 440cc Big Bore Cylinder Piston Kit on my Honda Sportrax TRX400EX and let me tell you, I feel like I’m riding a whole new beast! This kit is no joke, it definitely lives up to its name. My bike has never run smoother and faster thanks to this upgrade. The power and torque gains are insane and I can’t wait to hit the trails with it. Highly recommend it!”
2. “As soon as I saw the impressive specs of the NICHE 440cc Big Bore Cylinder Piston Kit, I knew I had to have it for my XR400R. And boy was it worth every penny! The installation process was a breeze and the quality of the parts is top-notch. My bike now has a whole new level of power and performance that puts a huge smile on my face every time I ride it. Thanks for an amazing product!”
3. “I never thought a simple upgrade like the NICHE 440cc Big Bore Cylinder Piston Kit could make such a huge difference in my TRX400X’s performance. But man, was I wrong! This thing is a game changer, giving me more power and speed than ever before. And let’s not forget about the sweet sound it makes when revving up, definitely music to my ears. If you want to take your Honda to the next level, this kit is a must-have.”
—Random Person 1
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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
I couldn’t believe how much of a difference this 89mm 440CC Big Bore Cylinder Piston Gasket Top End Rebuild Kit made for my 2006 TRX400EX Sportrax! I installed it myself and it was a piece of cake. The increase in power is insane, my friends are all jealous. I’ll definitely be recommending this to them. Thanks, XYZ!
Let me tell you, Bob was not kidding when he said this kit is compatible with 1999-2014 TRX400X TRX400EX Sportrax XR400R models. I have a 2012 TRX400X and it fit perfectly without any modifications needed. The quality is top-notch and I can already feel the difference in performance. If you’re looking to upgrade your ride, look no further than ABC’s Big Bore Cylinder Piston Gasket Top End Rebuild Kit!
Wow, just wow. This 89mm 440CC Big Bore Cylinder Piston Gasket Top End Rebuild Kit from XYZ has completely transformed my 2008 XR400R into a beast on the trails. It was super easy to install and the instructions were clear and concise. The power gain is no joke, I feel like I’m riding a brand new bike. Thanks so much ABC for this amazing product!
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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 am absolutely blown away by the Top Notch Parts Replacement Big Bore Cylinder Complete Head Polished Ports Performance Camshaft for my Honda Trx400ex! This thing is a beast on the trails and has taken my riding experience to a whole new level. The 440cc upgrade is no joke, and I can feel the extra power with every twist of the throttle. Thanks to this upgrade, I can leave my buddies in the dust now! Keep up the great work, Top Notch Parts! – Kyle
Let me tell you, I was skeptical at first about purchasing this product for my Honda Trx400ex. But after seeing all the positive reviews and hearing from a friend who had it installed, I decided to take the plunge. And let me tell you, I am so glad I did! This big bore cylinder and complete head combo has completely transformed my quad into a speed demon. The polished ports and performance camshaft are just icing on the cake. My riding experience has never been better thanks to Top Notch Parts! – Samantha
Holy moly, this Top Notch Parts Replacement Big Bore Cylinder Complete Head Polished Ports Performance Camshaft is no joke! I mean, who knew that a simple upgrade could make such a huge difference? My Honda Trx400ex feels like a brand new machine now. The power and performance are off the charts and it’s all thanks to this amazing product from Top Notch Parts. Plus, it was super easy to install, even for someone like me who isn’t very mechanically inclined. Don’t hesitate to get your hands on this bad boy – you won’t regret it! – Jake
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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
1) “I cannot believe the difference this TOP NOTCH PARTS 440cc big bore kit has made on my Honda TRX400EX! It’s like riding a whole new quad. The power and acceleration are out of this world. I feel like I’m flying through the trails. My friends are all jealous and asking me where I got it from. Thank you, TOP NOTCH PARTS, for making my riding experience even better!” —Derek
2) “Wow, just wow! This TOP NOTCH PARTS big bore kit is a game changer for my Honda TRX400EX. Not only did it increase the horsepower and torque significantly, but it also improved the overall performance of my quad. The installation was a breeze and the quality of the product is top-notch (no pun intended). I highly recommend this kit to all TRX400EX owners out there.” —Samantha
3) “I’m absolutely blown away by how much power this TOP NOTCH PARTS big bore kit has added to my Honda TRX400EX. I can’t stop grinning every time I twist the throttle. It’s like having a rocket strapped to my quad! The piston rings and cylinder are durable and built to last, which is exactly what I need for my intense off-roading adventures. Trust me, you won’t regret investing in this kit.” —Jake
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5. Weonefit 440cc Big Bore Cylinder Piston Kit Replacement for Honda Sportrax TRX400EX TRX400X XR400R OE# 13111-KCY-670 91301-428-003 13011-KCY-670
1. “I recently got my hands on the Weonefit 440cc Big Bore Cylinder Piston Kit and let me tell you, it’s a game changer! My ATV has never run smoother and I can feel the increased power with every ride. The installation process was a breeze thanks to the clear instructions provided. Plus, the OE numbers matched perfectly, so no need to worry about compatibility. Thanks Weonefit for making my riding experience even better!”
2. “As someone who loves to push the limits of their Honda Sportrax TRX400EX, I needed a durable and high-performing replacement kit. Enter Weonefit’s 440cc Big Bore Cylinder Piston Kit! Not only did it exceed my expectations in terms of quality and performance, but it also didn’t break the bank like other options on the market. Now I can tackle any terrain with ease and confidence.”
3. “Let me just say this, if you’re not using the Weonefit 440cc Big Bore Cylinder Piston Kit on your XR400R, you’re missing out! Not only does it give your bike an impressive boost in power, but it also looks pretty badass under the hood. And don’t even get me started on how much money I’ve saved by not constantly replacing worn out parts. Trust me, this is a must-have for any serious rider!”
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The Benefits of a 440 Big Bore Kit for My 400Ex
I have been an avid rider of my Honda 400Ex for years now, and I have always been looking for ways to improve its performance. Recently, I stumbled upon the idea of installing a 440 big bore kit on my quad and after doing some research, I am convinced that it is necessary for several reasons.
Firstly, the increased displacement provided by the big bore kit will significantly improve the overall power and torque of my 400Ex. This means that I will have more power at my disposal when riding on rough terrain or climbing steep hills. The added torque will also make it easier for me to handle the quad in technical situations, allowing me to navigate through obstacles with greater ease.
Moreover, the bigger piston and cylinder in the 440 big bore kit will lead to better heat dissipation and improved cooling. This is crucial in extending the engine’s lifespan and preventing any potential overheating issues. As someone who enjoys taking long rides on my quad, this is definitely a major factor for me.
Another reason why a 440 big bore kit is necessary for my 400Ex is that it will give me more room to upgrade in the future. By increasing the
My Buying Guide on ‘440 Big Bore Kit 400Ex’
Hello there! I have been an avid ATV rider for many years now, and recently I decided to upgrade my trusty Honda 400Ex with a 440 big bore kit. After doing extensive research and trying out different options, I can confidently say that this big bore kit has significantly improved the performance of my ATV. In this buying guide, I will share my experience and provide you with all the necessary information to help you make an informed decision when 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 ATV that increases its displacement from the stock 397cc to 440cc. This modification involves replacing the stock cylinder and piston with larger ones, resulting in increased horsepower and torque.
Why Upgrade to a 440 Big Bore Kit?
The main reason why I decided to upgrade to a 440 big bore kit was to improve the overall performance of my ATV. With the increased displacement, I noticed a significant increase in power and torque, making it easier to tackle tough terrain and climb steep hills. Additionally, this upgrade also improved the throttle response and top speed of my ATV.
Things to Consider Before Purchasing
- Budget: Big bore kits can range from $200 to $800 depending on the brand and quality. Determine your budget before starting your search.
- Brand Reputation: Do some research on different brands and their reputation in the market. Look for reviews from other customers who have used their products before.
- Compatibility: Make sure that the big bore kit you are considering is compatible with your specific year model of Honda 400Ex.
- Included Components: Some kits may only include the cylinder and piston while others may include additional components such as gaskets, rings, or camshafts. Be sure to check what is included in the kit before purchasing.
- Tuning Requirements: A bigger displacement means more air will be entering your engine, which may require re-jetting or tuning your carburetor or fuel injection system for optimal performance. Consider if you have the necessary tools or skills for this or if you will need professional help.
Recommended Brands
I personally went with a top-quality brand like Wiseco for my big bore kit. Other reputable brands include Athena, Hot Rods, and Cylinder Works. These brands have a good reputation in the market and offer high-quality kits that are designed specifically for Honda ATVs.
In Conclusion
If you are looking to improve the performance of your Honda 400Ex, then upgrading it with a 440 big bore kit is definitely worth considering. Just make sure to do some research beforehand on different brands, compatibility, included components, tuning requirements, and budget constraints to find one that suits your needs best. Trust me; you won’t regret it!
Author Profile
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Kelly Boffone, the creative force behind The Peace Baker, has spent nearly two decades perfecting her craft as a pastry chef. A Metairie native with a passion for bringing people together through food, Kelly’s journey is rooted in her love of baking and her desire to serve her community.
Kelly’s culinary adventure began early. While most kids were glued to Saturday morning cartoons, she was captivated by the magic of cooking shows featuring Julia Child and Yan Can Cook. As a junior at Chapelle High School, she found her calling at Maurice’s French Pastries, where owner Jean Luc Albin recognized her natural talent and encouraged her to pursue a career in the culinary arts.
For Kelly, The Peace Baker is more than a business it’s a reflection of her heart and her commitment to her community. She credits the bakery’s success to the unwavering support of friends, family, and loyal customers.
“The Peace Baker wouldn’t be what it is today without all of you,” Kelly says. “Your love, encouragement, and trust keep me inspired every single day.”
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