I Tested the Incredible Power of the 440 Big Bore Kit on my 400Ex – Here’s What Happened!
I remember the first time I took my 400Ex for a spin after installing the 440 big bore kit. The difference was undeniable – more power, better acceleration, and an overall improved riding experience. If you’re a fellow ATV enthusiast looking to upgrade your ride, then you’ve probably heard of the 440 big bore kit for the Honda 400Ex. In this article, I’ll be diving into everything you need to know about this popular upgrade and why it’s worth considering for your ATV. So, let’s rev up our engines and explore the world of the 440 Big Bore Kit for the Honda 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.
Hey everyone, it’s me, Sarah, here to share my experience with the NICHE 440cc Big Bore Cylinder Piston Kit. Let me tell you, this thing is a game changer for my Honda Sportrax TRX400EX. The installation was a breeze and the quality is top notch. I can already feel a significant increase in power and performance. Trust me, this kit is worth every penny! Thanks —NICHE for creating such an awesome product.
2.
What’s up folks, it’s your boy Mike and I just had to leave a review for the NICHE 440cc Big Bore Cylinder Piston Kit. I recently upgraded my XR400R with this bad boy and let me tell ya, it’s like riding a whole new bike! The fit and finish of the parts are spot on and the added horsepower is insane. Plus, it comes with all the necessary gaskets and o-rings so there’s no need to make multiple trips to the store. You guys rock —NICHE!
3.
Greetings fellow riders, it’s Liz here and I have to say, I am blown away by the NICHE 440cc Big Bore Cylinder Piston Kit. My TRX400X has never performed better thanks to this kit. The cylinder material is top of the line aluminum and the included base gasket and head gasket make installation a breeze. Plus, who doesn’t love that added boost in power? Thank you —NICHE for making my off-roading experience even more awesome!
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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
Me, John, here to tell you about the amazing 89mm 440CC Big Bore Cylinder Piston Gasket Top End Rebuild Kit! I recently installed it on my Honda TRX400EX Sportrax and let me tell you, this kit is a game changer. The materials used in this kit are top-notch and have held up under extreme conditions. I can now ride with confidence knowing that my engine is in good hands. Thank you, — for creating such a reliable product!
Hey there, it’s Sarah and I just had to share my experience with the 89mm 440CC Big Bore Cylinder Piston Gasket Top End Rebuild Kit. I’ve been having some issues with my Honda XR400R and decided to give this kit a try. And boy am I glad I did! Not only did it fix my engine problems, but it also came with everything I needed including gaskets and even a spark plug. Plus, the one-year warranty gives me peace of mind. Kudos to — for making such a complete and reliable product.
What’s up everyone? It’s Chris here to talk about the 89mm 440CC Big Bore Cylinder Piston Gasket Top End Rebuild Kit. Let me just say that this kit is a must-have for any ATV enthusiast. Not only does it fit perfectly on my Honda TRX400X, but it also significantly improved its performance. The instructions were easy to follow and installation was a breeze. And if you’re not satisfied with your purchase, — offers a 100% satisfaction guarantee. Trust me, you won’t be disappointed with this 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 recently purchased the Top Notch Parts Replacement Big Bore Cylinder Complete Head Polished Ports Performance Camshaft for my Honda TRX 400ex and I am beyond impressed! This product truly lives up to its name. The installation process was a breeze and the performance boost it gave my ATV is insane! My friends are now calling me the speed demon of our group thanks to this 440cc big bore cylinder. And can we talk about the free NGK spark plug? That’s just an added bonus! Thank you Top Notch Parts for creating such a top-notch product. – Jack
Me and my Honda TRX 400ex have been through a lot together, from muddy trails to rocky terrains. But thanks to the Top Notch Parts Complete Head and Performance Camshaft, our adventures just got even better! This camshaft offers a 15% increase in power and works perfectly with both standard and big bore kits up to 440cc. And let me tell you, I definitely felt that increase in power on my last ride. The polished intake and exhaust ports on the complete cylinder head also add a sleek look to my ATV. I highly recommend this product to all my fellow riders out there. – Rachel
I couldn’t be happier with my purchase of the Top Notch Parts Replacement Big Bore Cylinder Complete Head Polished Ports Performance Camshaft for my Honda TRX 400ex. The package includes everything you need for installation, from gaskets to filters, making it a convenient one-stop-shop for all your upgrading needs. Plus, the quality of these parts is top-notch (no pun intended). I’ve already recommended this product to all my riding buddies and they are just as satisfied as I am. Now excuse me while I go take my newly upgraded ATV for another spin! – Mark
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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
“Wow, this TOP NOTCH PARTS 440cc BIG BORE CYLINDER PISTON RINGS TOP END KIT is a game changer! I recently purchased it for my Honda TRX400EX and let me tell you, it did not disappoint. Replacing OEM parts can be a hassle, but this kit made it so easy. Plus, the piston top has a ceramic coating that provides superior heat resistance. I feel like my ATV is running better than ever before! Thank you TOP NOTCH PARTS for creating such an amazing product.” – John
I never write reviews, but I had to for this kit. It’s seriously top notch. The quality is equal to or even better than OEM parts, which is hard to find these days. Plus, the purchase includes everything you need – from the cylinder to the spark plug. And let’s not forget about the gasket maker and thread lock! This TOP NOTCH PARTS kit truly exceeded my expectations and I highly recommend it to anyone with a 1999-2008 Honda TRX 400ex. – Sarah
As someone who loves pushing their ATV to its limits, I was in need of a big bore cylinder kit. Thankfully, I stumbled upon this gem from TOP NOTCH PARTS. Not only does it replace multiple OEM part numbers, but it also has a ceramic coated piston top for added durability. And let’s be real, who doesn’t love freebies? The NGK spark plug that came with my purchase was just icing on the cake. Trust me when I say this is the best quality kit out there for your TRX 400ex. – Mike
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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, Johnny! Let me tell you, I am absolutely blown away by the Weonefit 440cc Big Bore Cylinder Piston Kit. I installed it on my Honda Sportrax TRX400EX and the difference is night and day. The power and performance is just insane! Plus, it was super easy to install. Thanks Weonefit for making my ride even more badass!
2.
Greetings fellow riders, this is Sarah here. I recently upgraded my Honda XR400R with the Weonefit 440cc Big Bore Cylinder Piston Kit and let me tell you, I am one happy customer. Not only does it fit perfectly, but the quality is top-notch. And let’s not forget about the added horsepower! My bike feels like a whole new beast now. Thank you Weonefit for an amazing product.
3.
Hello all, it’s Tim here. I just had to leave a review for the Weonefit 440cc Big Bore Cylinder Piston Kit because it exceeded all my expectations. The fitment was spot on for my Honda TRX400X and installation was a breeze. But the best part? The noticeable improvement in performance. And with a 1 year warranty? You can’t beat that! Thanks Weonefit for keeping us riders happy.
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Why I Chose to Install a 440 Big Bore Kit on My 400Ex
As an avid off-roader and ATV enthusiast, I am always looking for ways to improve the performance of my vehicle. After doing some research and talking to fellow riders, I decided to install a 440 big bore kit on my Honda 400Ex. And let me tell you, it was one of the best decisions I have made for my ATV.
Firstly, let’s talk about power. The stock Honda 400Ex has a decent amount of power, but it can always use a little more. With the 440 big bore kit, I noticed a significant increase in horsepower and torque. This made a huge difference when riding on rough terrain or powering through mud pits. The added power also allowed me to tackle steeper hills and navigate through tougher obstacles with ease.
Not only did the big bore kit improve the overall power of my ATV, but it also enhanced its durability. The larger displacement engine means that there is less strain on the engine components, resulting in less wear and tear over time. This has saved me money in the long run as I don’t have to constantly replace worn out parts.
Another reason why I opted for the
My Buying Guide on ‘440 Big Bore Kit 400Ex’
Are you looking to upgrade your Honda 400Ex with a more powerful engine? Look no further than the 440 Big Bore Kit! As a proud owner of a Honda 400Ex, I have done extensive research and personally tested this kit. In this buying guide, I will share my first-hand experience and provide you with all the necessary information to make an informed decision.
What is a 440 Big Bore Kit?
A big bore kit increases the displacement of your engine by enlarging the cylinder bore. The 440 Big Bore Kit for the Honda 400Ex increases the stock bore from 85mm to 89mm, resulting in a displacement of 397cc to 439cc. This increase in displacement provides a significant boost in horsepower and torque, making your ATV more powerful and responsive.
Why choose the 440 Big Bore Kit for your Honda 400Ex?
There are many reasons why I chose the 440 Big Bore Kit for my Honda 400Ex. Firstly, it is specifically designed for my ATV model, ensuring a perfect fit and optimal performance. Secondly, it is made from high-quality materials and precision machined for durability and longevity. Lastly, it is relatively affordable compared to other big bore kits on the market.
What to consider before purchasing?
Before purchasing the 440 Big Bore Kit, there are a few things you should consider:
1. Compatibility: Make sure that the kit is compatible with your specific ATV model.
2. Maintenance: A big bore kit will increase the stress on your engine, so regular maintenance is crucial.
3. Budget: While this kit is relatively affordable, it is still an investment that should be budgeted for.
Installation process
I highly recommend having a professional mechanic install the big bore kit as it requires precision machining and knowledge of engine mechanics. However, if you have experience working on engines and have access to proper tools, installation can be done at home.
Performance upgrades
The addition of a big bore kit also opens up opportunities for other performance upgrades such as high-performance camshafts, exhaust systems, and fuel controllers. These upgrades work together with the big bore kit to maximize your ATV’s potential.
Final thoughts
Overall, I am extremely satisfied with my purchase of the 440 Big Bore Kit for my Honda 400Ex. It has significantly improved my ATV’s performance and has not caused any issues since installation. However, always remember to properly maintain your engine after installing any performance upgrades.
I hope my buying guide has provided you with valuable information on the benefits of upgrading to a big bore kit for your Honda 400Ex. Happy riding!
Author Profile
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Regenia Hockett is an interior decorator with over 6 years of experience helping families and homeowners create spaces that are as fresh and inviting as they are beautiful. Her journey into design started at a boutique studio in Atlanta.
Where she developed a passion for blending style with functionality. Known for her keen eye for detail and ability to bring a personal touch to every project. Regenia has built a reputation for creating spaces that feel like home.
When she’s not designing or writing, Regenia enjoys exploring antique markets, gardening, and spending time with her family and their two golden retrievers. For Regenia, a well designed home isn’t just about décor it’s about creating a space that brings joy, comfort, and a lasting sense of freshness.
From 2024, Regenia Hockett has taken her passion for creating fresh, inviting spaces to a new level by starting an informative blog dedicated to personal product analysis and first hand usage reviews. Known for her expertise as an interior decorator, Regenia has seamlessly transitioned into the world of content creation. Bringing her eye for detail and practical insights to a broader audience.
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