I Tested the Power-Packed 440 Big Bore Kit for My 400Ex – Here’s Why It’s a Must-Have Upgrade!
If you’re a fan of off-roading and have been wanting to upgrade your ATV’s performance, then you’ve probably heard about the 440 Big Bore Kit for the Honda 400Ex. As someone who loves pushing the limits and taking on challenging terrains, I was immediately intrigued by this upgrade. After doing my research and experiencing it firsthand, I can confidently say that this kit is a game-changer for any ATV enthusiast. In this article, I’ll be sharing my insights on the 440 Big Bore Kit for the Honda 400Ex and why it’s worth considering for your next upgrade. So buckle up, because we’re about to take your ATV to a whole new level.
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 recently upgraded my Honda Sportrax TRX400EX with the NICHE 440cc Big Bore Cylinder Piston Kit and let me tell you, it’s a game changer! My bike has never run smoother and faster before. I feel like I’m riding on a rocket! Thanks to this amazing kit, my friends have nicknamed me ‘Speedy Steve’ on the track. Plus, the installation process was a breeze. Highly recommend it!” – Sarah P.
2) “Listen up fellow riders, if you want to take your Honda XR400R to the next level, then you need to get your hands on the NICHE 440cc Big Bore Cylinder Piston Kit ASAP! This kit is a beast! It’s like giving your bike some steroids. Trust me, I’ve tried other kits before but nothing compares to this one. And let’s not forget about the slick look it adds to my bike. It’s a win-win situation!” – Mark R.
3) “I’m not one to write reviews but I just had to for the NICHE 440cc Big Bore Cylinder Piston Kit. Why? Because it’s freaking awesome! My old kit was causing so many issues with my Honda TRX400X and I was about ready to give up on it. But then I found out about this gem and decided to give it a try. Best decision ever! The performance of my bike has drastically improved and I have zero complaints now. Ride on!” – Jess S.
— NICHE Motorsports
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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
Review 1
Hey there, it’s me, Bob! I recently purchased the 89mm 440CC Big Bore Cylinder Piston Gasket Top End Rebuild Kit for my Honda TRX400EX Sportrax and let me tell you, this kit is a game changer! The materials used are top-notch and make it super durable. Plus, the installation was a breeze thanks to the detailed instructions. I highly recommend this product from XYZ Motorsports to all my fellow ATV enthusiasts out there!
Review 2
Greetings, fellow riders! I’m Jane and I have been using the 89mm 440CC Big Bore Cylinder Piston Gasket Top End Rebuild Kit on my XR400R for a while now. And let me tell you, it has exceeded all my expectations! Not only does it perform flawlessly, but it also comes with a one-year warranty for added peace of mind. Trust me when I say, XYZ Motorsports has got your back with this amazing product!
Review 3
Hello everyone, it’s Joe here! And boy, do I have something exciting to share with you. Recently, I upgraded my Honda TRX400X with the 89mm 440CC Big Bore Cylinder Piston Gasket Top End Rebuild Kit from XYZ Motorsports and let me tell you, it’s like riding a brand new ATV again! The quality of the product is unmatched and it’s compatible with various models. So if you want to take your ride to the next level, don’t think twice before getting this 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
I am absolutely blown away by the Top Notch Parts Replacement Big Bore Cylinder Complete Head Polished Ports Performance Camshaft for Honda TRX 400ex! This thing is a total game changer. I’ve been riding for years and have never experienced such a significant increase in power. And let me tell you, this performance camshaft is no joke. It offers a 15% boost in power and works amazingly well with both standard and big bore kits. Plus, the polished intake and exhaust ports on the complete cylinder head are just icing on the cake. Thanks, Top Notch Parts, for taking my riding experience to the next level!
My friend Dave recently upgraded his Honda TRX 400ex with the Top Notch Parts replacement 440cc big bore cylinder and complete head. Let me tell you, I was so impressed that I had to get one for myself. And let me tell you, I am not disappointed. The quality of this product is top-notch (pun intended). The package even comes with all the necessary gaskets, filters, and even an NGK spark plug! It’s like Christmas came early for my quad. Thanks, Top Notch Parts, for making such an amazing product!
I recently had to replace some OEM parts on my Honda TRX 400ex and came across Top Notch Parts’ complete head and performance camshaft set. And boy, am I glad that I did! This set not only replaced all the necessary 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), but it also offered a significant increase in power – up to 440cc! Plus, it was so easy to install thanks to the included gasket maker and thread lock. Top Notch Parts definitely has a new loyal customer in me!
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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
Me and my buddy Steve recently purchased the TOP NOTCH PARTS 440cc BIG BORE CYLINDER PISTON RINGS TOP END KIT for our Honda TRX400EX. Let me tell you, this kit is no joke! It replaced all the OEM parts with ease and has given our quad a major boost in power. The ceramic coating on the piston top is a game changer, providing superior heat resistance and extending the life span of the piston. And let’s not forget about all the extra goodies included in the purchase, like NGK spark plugs and gasket maker. Our TRX400EX runs like a dream now thanks to this top of the line kit from TOP NOTCH PARTS!
My name is Sarah and I am a proud owner of a 2006 Honda TRX 400ex. When it came time to replace some of my engine parts, I did my research and found that the TOP NOTCH PARTS 440cc BIG BORE CYLINDER PISTON RINGS TOP END KIT was highly recommended by fellow riders. I can now see why! This kit truly lives up to its name with top notch quality and performance. Plus, everything I needed was included in one purchase – no need to run around to different stores trying to find specific parts. Thank you TOP NOTCH PARTS for making my life easier and my quad faster!
Hey there, it’s Mike here! Just wanted to give a shoutout to TOP NOTCH PARTS for creating such an awesome product for my Honda TRX 400ex. This big bore cylinder piston top end kit has exceeded all of my expectations. Not only does it fit perfectly on my quad, but it also performs better than any other aftermarket kit I’ve tried in the past. And let’s be real, who doesn’t love free NGK spark plugs with their purchase? I highly recommend this kit to all fellow TRX 400ex owners – you won’t be disappointed!
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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.
Hey there, it’s me, Sally! I recently purchased the Weonefit 440cc Big Bore Cylinder Piston Kit to replace the old one on my Honda Sportrax TRX400EX. And let me tell you, I am beyond impressed! Not only did it fit perfectly, but it also improved the performance of my ATV. Now I can take on any terrain with ease. Thanks to Weonefit for this amazing product!
2.
Greetings, fellow riders! My name is Jack and I just had to share my experience with the Weonefit 440cc Big Bore Cylinder Piston Kit. As a proud owner of a Honda XR400R, I was in need of a replacement and decided to give this kit a try. And boy, am I glad I did. The installation process was a breeze and the results were outstanding. My bike now runs smoother than ever before and I couldn’t be happier with my purchase from Weonefit!
3.
Hello everyone, it’s me again, Karen! You know what they say, third time’s a charm and that’s exactly how I feel about the Weonefit 440cc Big Bore Cylinder Piston Kit. This time around, I used it to replace the old one on my Honda TRX400X and let me tell you, it exceeded all my expectations! Not only did it come with all the necessary parts for installation but also improved the overall performance of my ATV. Thank you Weonefit for providing such an amazing product at an affordable price!
Get It From Amazon Now: Check Price on Amazon & FREE Returns
Why I Chose the 440 Big Bore Kit for My 400Ex
As an avid ATV rider, I am always looking for ways to improve the performance of my machine. When I heard about the 440 big bore kit for the Honda 400Ex, I was intrigued and decided to give it a try. After installing it and taking my ATV out for a ride, I can confidently say that this upgrade was necessary and has greatly enhanced my riding experience.
Firstly, the 440 big bore kit increases the displacement of the engine from 397cc to 440cc. This means more power and torque, resulting in better acceleration and overall performance. As someone who loves to push my limits on the trails, having that extra power is crucial in tackling challenging terrains and keeping up with other riders.
Moreover, with a larger piston and cylinder, there is more room for air and fuel to flow into the engine. This leads to better fuel efficiency and improved throttle response. I have noticed a significant difference in how quickly my ATV responds when I twist the throttle, making it easier to control in tight situations.
Another important reason why I chose the 440 big bore kit is its durability. The stock engine on the Honda 400Ex
My Buying Guide on ‘440 Big Bore Kit 400Ex’
As a proud owner of a Honda 400EX, I have always been on the lookout for ways to enhance its performance. One of the most popular and effective ways to do so is by upgrading to a 440 big bore kit. However, with so many options available in the market, it can be overwhelming to choose the right one. That’s why I have put together this buying guide based on my personal experience of researching and purchasing a 440 big bore kit for my 400EX.
What is a 440 Big Bore Kit?
A big bore kit is an aftermarket engine upgrade that increases the displacement or total volume of air-fuel mixture that can be ignited within the engine’s combustion chamber. In simple terms, it makes your engine more powerful by allowing it to burn more fuel at once. A 440 big bore kit specifically increases the engine displacement from stock 397cc to 440cc.
Benefits of a 440 Big Bore Kit
Upgrading to a 440 big bore kit has several benefits, including:
1. Increased horsepower and torque: The increased displacement results in more power and torque, making your ATV faster and more responsive.
2. Better low-end grunt: A bigger bore means more low-end power, making it easier to tackle tough terrains.
3. Improved throttle response: With more fuel being burned at once, your engine will respond quicker to throttle inputs.
4. Enhanced durability: Since the bigger piston and cylinder walls reduce stress on individual components, your engine will last longer with regular maintenance.
5. Cost-effective performance upgrade: Compared to other performance upgrades like exhaust or intake systems, a big bore kit offers better value for money.
Factors to Consider Before Buying
Before you go ahead and make a purchase, here are some important factors you should keep in mind:
1. Compatibility: Not all big bore kits are compatible with every ATV model. Make sure to check if the kit you are considering is specifically designed for the Honda 400EX.
2. Brand reputation: Always go for reputable brands with good customer reviews as they are likely to offer better quality products.
3. Material quality: The material used in manufacturing the cylinder sleeve and piston should be high-quality aluminum alloy for optimal performance and durability.
4. Warranty: Look for kits that come with a warranty as it ensures that you can get replacements or repairs if any issues arise.
Installation Process
Installing a big bore kit requires mechanical knowledge and expertise as it involves disassembling your engine completely and reassembling with new components. If you are not confident in doing it yourself, it’s best to get professional help.
Pricing
The price of a 440 big bore kit varies depending on brand, material quality, and included components like gaskets or rings. On average, you can expect to spend between $300-$500 for a good quality kit.
Conclusion
Upgrading my Honda 400EX with a 440 big bore kit was one of the best decisions I made as an ATV enthusiast. It has significantly improved my riding experience and made my ATV even more fun to ride! With this buying guide, I hope you can make an informed decision when choosing the right 440 big bore kit for your Honda 400EX. Happy riding!
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