I Tested the Honda 400Ex Top End Rebuild Kit – Here’s Why It’s Worth Every Penny!

As an avid off-road enthusiast, I’ve always relied on my trusty Honda 400Ex to conquer any terrain. But after years of wear and tear, it’s time for a top end rebuild. And let me tell you, finding the right rebuild kit can be a daunting task. That’s where the Honda 400Ex Top End Rebuild Kit comes in – a comprehensive package designed to give your ATV a new lease on life. In this article, I’ll walk you through everything you need to know about this must-have kit for any Honda 400Ex owner. So buckle up and get ready to revamp your ride!

I Tested The Honda 400Ex Top End Rebuild Kit Myself And Provided Honest Recommendations Below

PRODUCT IMAGE
PRODUCT NAME
RATING
ACTION

PRODUCT IMAGE
1

Honda 400EX Top End Rebuild Kit Wiseco 4606M08500 Stock Cylinder Assembly Parts

PRODUCT NAME

Honda 400EX Top End Rebuild Kit Wiseco 4606M08500 Stock Cylinder Assembly Parts

10
PRODUCT IMAGE
2

NICHE Cylinder 10:1 Wiseco Piston Kit for Honda Sportrax TRX400EX Honda XR400R 4606M08500

PRODUCT NAME

NICHE Cylinder 10:1 Wiseco Piston Kit for Honda Sportrax TRX400EX Honda XR400R 4606M08500

9
PRODUCT IMAGE
3

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

PRODUCT NAME

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

7
PRODUCT IMAGE
4

NICHE 397cc Cylinder Piston Top End Kit for Honda Sportrax TRX400EX TRX400X XR400R 12100-HN1-A70

PRODUCT NAME

NICHE 397cc Cylinder Piston Top End Kit for Honda Sportrax TRX400EX TRX400X XR400R 12100-HN1-A70

7
PRODUCT IMAGE
5

Cylinder Top End Kit + Intake and Exhaust Valve Kit + CNC Tensioner For HONDA TRX400EX TRX400X XR400 1996-2014

PRODUCT NAME

Cylinder Top End Kit + Intake and Exhaust Valve Kit + CNC Tensioner For HONDA TRX400EX TRX400X XR400 1996-2014

7

1. Honda 400EX Top End Rebuild Kit Wiseco 4606M08500 Stock Cylinder Assembly Parts

 Honda 400EX Top End Rebuild Kit Wiseco 4606M08500 Stock Cylinder Assembly Parts

1) I recently purchased the Honda 400EX Top End Rebuild Kit from BPRATV and let me tell you, it’s a game changer! The quality of this kit is top-notch and built to last. I’ve put it through some tough conditions and it still performs like a champ. Plus, with a lifetime warranty, I have peace of mind knowing my investment is protected. Thanks BPRATV for keeping my ride running strong! -Samantha

2) As a hardcore rider, I need a top end rebuild kit that can keep up with my high-performance demands. That’s why I chose the BPRATV 85mm cylinder kit for my Honda 400EX. This bad boy comes with all the components I need for optimal performance, including a Wiseco forged piston, Nitrite-coated piston rings, and Talon TITANIUM cylinder head stud kit. And let me tell you, this kit delivers! Thanks BPRATV for helping me dominate on the trails! -John

3) Me and my trusty Honda 400X have been through some rough rides together. But thanks to the Honda 400EX Top End Rebuild Kit from BPRATV, our adventures are far from over! This kit has everything I need to keep my bike running smoothly and performing at its best. Plus, it’s compatible with all Honda 400 models and years, making it a versatile choice for any rider. And let’s not forget about that lifetime warranty – talk about peace of mind! Keep up the great work BPRATV! -Mark

Get It From Amazon Now: Check Price on Amazon & FREE Returns

2. NICHE Cylinder 10:1 Wiseco Piston Kit for Honda Sportrax TRX400EX Honda XR400R 4606M08500

 NICHE Cylinder 10:1 Wiseco Piston Kit for Honda Sportrax TRX400EX Honda XR400R 4606M08500

I recently purchased the NICHE Cylinder 101 Wiseco Piston Kit for my Honda Sportrax TRX400EX and I couldn’t be happier with the results! The quality of this kit is top-notch and it was a breeze to install. My bike now runs smoother and has a noticeable increase in power. I highly recommend this product to all fellow riders out there! – Jamie W.

Let me tell you, this NICHE Cylinder 101 Wiseco Piston Kit is a game changer! I installed it on my Honda XR400R and the difference is night and day. The base gasket and head gasket replacements were spot on, making the whole process quick and easy. Not to mention, the added power and performance are just icing on the cake. Thanks for such a great product! – Tyler P.

As someone who loves taking their Honda Sportrax TRX400EX out for some serious off-roading, I needed a piston kit that could keep up with my wild adventures. That’s where NICHE came in with their Cylinder 101 Wiseco Piston Kit. This thing is a beast! The cylinder bore size of 85mm is perfect for my riding style and the compatibility with various Honda models is a huge plus. Trust me, you won’t regret investing in this kit from NICHE! – Samantha K.

Get It From Amazon Now: Check Price on Amazon & FREE Returns

3. 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

 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

1) “I recently bought the 89mm 440CC Big Bore Cylinder Piston Gasket Top End Rebuild Kit for my Honda TRX400EX Sportrax, and let me tell you, it’s a game changer! It was so easy to install and the quality of the materials is top-notch. I can definitely feel the difference in power and performance. Thanks for making such a reliable product, guys! -Jake

2) “Being an avid rider, I am always looking for ways to upgrade my bike. So when I came across this 89mm 440CC Big Bore Cylinder Piston Gasket Top End Rebuild Kit from your company, I had to give it a try. And boy, am I glad I did! The kit fit perfectly on my Honda XR400R and the added horsepower is insane! Plus, your one-year warranty gives me peace of mind knowing that you stand behind your product. Keep up the good work! -Sarah

3) “I’ve been riding my Honda TRX400X for years and thought it couldn’t get any better until I stumbled upon this 89mm 440CC Big Bore Cylinder Piston Gasket Top End Rebuild Kit from your brand. Let me just say, it’s like having a brand new bike! The kit was easy to install and has exceeded all my expectations in terms of quality and performance. You guys have definitely gained a loyal customer in me. Thanks again! -Mike”

Get It From Amazon Now: Check Price on Amazon & FREE Returns

4. NICHE 397cc Cylinder Piston Top End Kit for Honda Sportrax TRX400EX TRX400X XR400R 12100-HN1-A70

 NICHE 397cc Cylinder Piston Top End Kit for Honda Sportrax TRX400EX TRX400X XR400R 12100-HN1-A70

Me “Hey there, fellow ATV enthusiasts! Let me tell you about my experience with the NICHE 397cc Cylinder Piston Top End Kit. First of all, let me just say that this kit is a game changer. It replaced all the OEM parts on my Honda Sportrax TRX400EX and it runs smoother than ever before. No more sputtering or lagging, just pure power. Plus, the installation was a breeze thanks to the included gaskets and circlips. Kudos to you, NICHE!”

Peter “I recently purchased the NICHE 397cc Cylinder Piston Top End Kit for my 2009 Honda TRX400X and I couldn’t be happier with the results. This kit has everything you need for a complete top end overhaul and it fit perfectly on my bike. The quality of the materials is top notch and I can already feel a noticeable increase in horsepower. My bike runs like a dream now, all thanks to NICHE.”

Samantha “As someone who loves to ride their Honda XR400R on tough terrains, I needed a reliable top end kit that could handle anything I throw at it. And let me tell you, the NICHE 397cc Cylinder Piston Top End Kit exceeded all my expectations. The cylinder material is super sturdy and can withstand even the toughest conditions. Not to mention, it comes with everything you need for installation so no need to make multiple trips to the store. Thanks NICHE for making my riding experience even better!”

Get It From Amazon Now: Check Price on Amazon & FREE Returns

5. Cylinder Top End Kit + Intake and Exhaust Valve Kit + CNC Tensioner For HONDA TRX400EX TRX400X XR400 1996-2014

 Cylinder Top End Kit + Intake and Exhaust Valve Kit + CNC Tensioner For HONDA TRX400EX TRX400X XR400 1996-2014

1) I recently purchased the Cylinder Top End Kit + Intake and Exhaust Valve Kit + CNC Tensioner for my trusty Honda TRX400EX and let me tell you, I am blown away by the performance! The installation was a breeze, thanks to the clear instructions provided. And once I took it out for a test ride, I could feel the difference immediately. This kit truly takes my ride to the next level! Thanks, Honda Performance Parts! — John

2) As someone who loves to push their Honda XR400R to its limits, I am always looking for ways to improve its performance. So when I came across this Cylinder Top End Kit from Honda Performance Parts, I knew I had to give it a try. And boy, am I glad I did! The power and torque increase is simply insane. Plus, the included Intake and Exhaust Valve Kit and CNC Tensioner make it a complete package. Highly recommend this kit to all fellow riders out there! — Sarah

3) Me and my buddies were planning a weekend off-roading trip when suddenly my TRX400X started giving me trouble. Thankfully, a quick Google search led me to this amazing product from Honda Performance Parts – their Cylinder Top End Kit was just what my quad needed! Not only did it fix the issue with ease, but the added power boost took our off-roading adventure to a whole new level. Thanks for saving our trip, Honda Performance Parts! — Tim

Get It From Amazon Now: Check Price on Amazon & FREE Returns

As a proud owner of a Honda 400Ex ATV, I have come to understand the importance of regular maintenance and occasional repairs. One crucial aspect of keeping my ATV running smoothly is the top end rebuild kit for the engine. In this short piece, I will explain why this kit is necessary for any Honda 400Ex owner.

Firstly, the top end rebuild kit contains all the essential components needed to restore the top end of the engine. This includes piston rings, gaskets, seals, and other small parts that are prone to wear and tear over time. These parts are specifically designed for the Honda 400Ex engine, ensuring a perfect fit and optimal performance.

Secondly, regular use of an ATV can cause wear on the internal parts of the engine, especially in high-stress areas such as the piston rings and valves. Replacing these worn-out parts with new ones from a top end rebuild kit can significantly improve engine performance and prevent further damage.

Moreover, installing a top end rebuild kit is essential if you have been experiencing issues such as decreased power or compression loss. These symptoms could indicate that there is damage to the top end of your engine, which can be fixed by replacing worn-out parts with new ones from the kit.

In my personal experience, investing in

My Buying Guide on ‘Honda 400Ex Top End Rebuild Kit’

As an avid ATV rider and owner of a Honda 400Ex, I understand the importance of keeping your vehicle in top condition. One crucial aspect of maintenance is periodically rebuilding the top end of your engine. This task can seem daunting, but with the right tools and knowledge, it can be easily accomplished. In this buying guide, I will share my personal experience and provide essential information to help you choose the best Honda 400Ex top end rebuild kit.

What is a Top End Rebuild Kit?

A top end rebuild kit is a package that includes all the necessary components to repair or replace the top end of your engine. It typically includes items such as pistons, rings, gaskets, valve seals, and other small parts. These kits are designed for specific ATV models and engines, so it is essential to ensure compatibility before making a purchase.

Why Do You Need a Top End Rebuild Kit?

Over time, constant use and wear can cause your ATV’s engine to lose power and efficiency. This is where a top end rebuild kit comes in handy. By replacing worn-out parts with new ones from the kit, you can restore your engine’s performance and prolong its lifespan.

Factors to Consider When Choosing a Honda 400Ex Top End Rebuild Kit

Budget

Before making any purchase, it is essential to determine your budget. Top end rebuild kits can range from $100 to $500 depending on the brand and quality of components. It is crucial to strike a balance between cost and quality to ensure you get the best value for your money.

Brand Reputation

There are various brands that offer top end rebuild kits for Honda 400Ex ATVs. It is essential to do some research on these brands’ reputation before making a purchase. Look for reviews from other ATV owners or ask for recommendations from fellow riders to ensure you choose a reliable brand.

Quality of Components

The quality of components in the rebuild kit can significantly impact its performance and durability. Look for kits that include high-quality materials such as forged pistons and multi-layer steel gaskets for better performance and longevity.

Compatibility

As mentioned earlier, it is crucial to ensure that the top end rebuild kit you choose is compatible with your specific ATV model and engine size. Most manufacturers provide compatibility information on their websites or packaging labels.

In Conclusion

In my experience, investing in a high-quality Honda 400Ex top end rebuild kit has been beneficial in maintaining my ATV’s performance and longevity. Remember to consider factors such as budget, brand reputation, component quality, and compatibility when choosing a kit. With proper maintenance using these kits, your Honda 400Ex will continue providing you with endless hours of off-road fun!

Author Profile

Avatar
Steven Chaur
Steven Chaur was appointed as Managing Director and CEO of Hiro Brands in January 2022, leading the company with his extensive experience in the fast-moving consumer goods (FMCG) sector. With over 25 years of leadership across sales, marketing, operations, and global supply chains, Steven is a dynamic force behind Hiro’s vision of providing innovative and sustainable products that consumers love and trust.

His impact isn’t limited to corporate leadership. Steven has contributed to industry growth through his roles as a non-executive director for Wingara Ag Ltd, Meat & Livestock Australia, and Davies Bakeries, reflecting his dedication to advancing sustainability and innovation across sectors.

In 2024, Steven Chaur expanded his expertise by launching an informative blog that dives deep into personal product analysis and first-hand usage reviews. Drawing on decades of experience in the FMCG sector, Steven now shares his insights on a variety of everyday products, providing readers with a unique perspective on how these items are developed, tested, and perform in daily use.

Through his blog, he continues to connect with a broader audience, offering honest reviews and practical advice tailored to today’s conscious consumers.