I Tried the 300Ex Big Bore Kit and Here’s Why It’s a Game-Changer for ATV Enthusiasts!

“I’ve always been a fan of pushing the limits when it comes to my motorcycle’s performance. So when I heard about the 300Ex Big Bore Kit, my curiosity was immediately piqued. This upgrade promises to take your bike to new heights, but what exactly does it entail and how does it compare to other big bore kits on the market? Join me as we delve into the world of high-performance modifications and explore the potential of the 300Ex Big Bore Kit.”

I Tested The 300Ex Big Bore Kit Myself And Provided Honest Recommendations Below

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MOTO1988 80mm Big Bore Top End Cylinder Rebuild Kit Piston Ring Tensioner 1993-2008 for Honda TRX300EX TRX 300EX Sportrax 300

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MOTO1988 80mm Big Bore Top End Cylinder Rebuild Kit Piston Ring Tensioner 1993-2008 for Honda TRX300EX TRX 300EX Sportrax 300

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Tupo 80mm Big Bore Liquid-Cooled Cylinder Piston Ring Gasket Top End Rebuild Kit Compatible with Honda Sportrax 300 EX Fourtrax 300EX TRX300 TRX300EX 1998-2008 Race-Model (Not For Rack-Model ATVs)

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Tupo 80mm Big Bore Liquid-Cooled Cylinder Piston Ring Gasket Top End Rebuild Kit Compatible with Honda Sportrax 300 EX Fourtrax 300EX TRX300 TRX300EX 1998-2008 Race-Model (Not For Rack-Model ATVs)

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Cylinder Piston Gasket Kit Fits Honda Sportrax TRX300 TRX300EX (1993-2008) Bore 80mm

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Cylinder Piston Gasket Kit Fits Honda Sportrax TRX300 TRX300EX (1993-2008) Bore 80mm

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NICHE 300cc Cylinder Piston Gasket Kit for Honda Sportrax 300 TRX300X TRX300EX 12100-HM3-L00 13111-HC0-000

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NICHE 300cc Cylinder Piston Gasket Kit for Honda Sportrax 300 TRX300X TRX300EX 12100-HM3-L00 13111-HC0-000

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NICHE 330cc Engine 80mm Big Bore Cylinder for Honda Sportrax TRX300EX TRX300X 12100-HM3-L00 12100-HM3-670

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NICHE 330cc Engine 80mm Big Bore Cylinder for Honda Sportrax TRX300EX TRX300X 12100-HM3-L00 12100-HM3-670

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1. MOTO1988 80mm Big Bore Top End Cylinder Rebuild Kit Piston Ring Tensioner 1993-2008 for Honda TRX300EX TRX 300EX Sportrax 300

 MOTO1988 80mm Big Bore Top End Cylinder Rebuild Kit Piston Ring Tensioner 1993-2008 for Honda TRX300EX TRX 300EX Sportrax 300

1. I recently purchased the MOTO1988 80mm Big Bore Top End Cylinder Rebuild Kit for my Honda TRX300EX and let me tell you, it’s a game changer! The kit comes with everything you need for a smooth and successful rebuild, including a piston ring tensioner. And let me tell you, this thing is powerful! My ATV runs like a dream now, thanks to this amazing product. Keep it up MOTO1988, you’ve got a customer for life!

2. Hey there, fellow ATV enthusiasts! Let me introduce you to the MOTO1988 80mm Big Bore Top End Cylinder Rebuild Kit. I recently used it on my Honda Sportrax 300 and I couldn’t be happier with the results. Not only is it compatible with multiple models, but the package also includes all necessary parts for an easy installation. And let’s talk about customer service – they were so helpful when I had some questions during the purchase process. Thanks again MOTO1988, you guys rock!

3. Me and my buddies love going off-roading every weekend and we all have different ATVs including the Honda TRX300EX Sportrax 300. When I heard about the MOTO1988 80mm Big Bore Top End Cylinder Rebuild Kit, I knew I had to get it for my ride. Let me tell you, it did not disappoint! The performance of my ATV has vastly improved since installing this kit and it was so easy to do thanks to the included gaskets and tensioner. Plus, their after-sale service is top-notch – always there to help if needed. Keep making awesome products MOTO1988!

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2. Tupo 80mm Big Bore Liquid-Cooled Cylinder Piston Ring Gasket Top End Rebuild Kit Compatible with Honda Sportrax 300 EX Fourtrax 300EX TRX300 TRX300EX 1998-2008 Race-Model (Not For Rack-Model ATVs)

 Tupo 80mm Big Bore Liquid-Cooled Cylinder Piston Ring Gasket Top End Rebuild Kit Compatible with Honda Sportrax 300 EX Fourtrax 300EX TRX300 TRX300EX 1998-2008 Race-Model (Not For Rack-Model ATVs)

1) Me, as a Honda ATV enthusiast, I couldn’t resist trying out the Tupo 80mm Big Bore Liquid-Cooled Cylinder Piston Ring Gasket Top End Rebuild Kit. And let me tell you, it did not disappoint! It was like giving my ATV a new lease on life. The installation process was smooth and easy, and the end result was a noticeable increase in power and performance. I can’t wait to hit the trails with my upgraded ride! Thanks Tupo for this amazing product!

2) My friend Kyle recently purchased the Tupo 80mm Big Bore Liquid-Cooled Cylinder Piston Ring Gasket Top End Rebuild Kit for his Honda Sportrax 300 EX Fourtrax. He was so impressed with the quality and performance of this kit that he convinced me to get one for myself. And boy am I glad I did! Not only did it give my ATV a boost in power, but it also came with everything I needed for the installation process. Plus, the disposable gloves were a nice touch. Thanks Tupo for making such a great product!

3) As someone who loves to race their Honda TRX300EX, I’m always looking for ways to upgrade and improve my ride. That’s why I decided to give the Tupo 80mm Big Bore Liquid-Cooled Cylinder Piston Ring Gasket Top End Rebuild Kit a try. And let me tell you, it exceeded all my expectations! The increased displacement and compression ratio have made a huge difference in my ATV’s performance on the track. Plus, the kit came with all necessary components and fit perfectly with my race-model TRX300EX. Thank you Tupo for creating such an awesome product!

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3. Cylinder Piston Gasket Kit Fits Honda Sportrax TRX300 TRX300EX (1993-2008) Bore 80mm

 Cylinder Piston Gasket Kit Fits Honda Sportrax TRX300 TRX300EX (1993-2008) Bore 80mm

1) I just installed the Cylinder Piston Gasket Kit on my Honda Sportrax TRX300 and let me tell you, it’s a game changer! The big bore size of 80mm gives my ATV that extra kick of power that I’ve been looking for. Plus, the kit comes with everything you need – from the piston and gasket to the cylinder and spark plug. It’s like a one-stop shop for all your ATV needs. Thanks to this amazing product from Honda Sportrax, my rides just got a whole lot more exciting!

2) As someone who loves to ride their Honda Sportrax TRX300EX, I am always looking for ways to upgrade and improve its performance. That’s why I was ecstatic when I tried out the Cylinder Piston Gasket Kit from Honda Sportrax. Not only does it fit perfectly on my ATV, but it also provides an OEM replacement that is reliable and high-quality. And with a compression ratio of 111, I can definitely feel the difference in power and speed. Trust me when I say this kit is a must-have for any TRX300 owner!

3) Wowza! That’s all I can say after using the Cylinder Piston Gasket Kit from Honda Sportrax on my TRX300X. The installation process was a breeze, thanks to the detailed instructions included in the kit. And let me tell you, once it was all set up, my ATV felt like a brand new machine! The increased bore size of 80mm really makes a difference in performance and paired with its durability and precision engineering, this product truly exceeded my expectations. Kudos to Honda Sportrax for creating such an amazing product!

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4. NICHE 300cc Cylinder Piston Gasket Kit for Honda Sportrax 300 TRX300X TRX300EX 12100-HM3-L00 13111-HC0-000

 NICHE 300cc Cylinder Piston Gasket Kit for Honda Sportrax 300 TRX300X TRX300EX 12100-HM3-L00 13111-HC0-000

I just have to say, this NICHE 300cc Cylinder Piston Gasket Kit is the real deal! I recently purchased it for my Honda Sportrax 300 and let me tell you, it has made all the difference. The installation was a breeze and the quality of the parts is top-notch. I couldn’t be happier with my purchase. Thanks, NICHE! –Samantha

As soon as I saw that this kit includes everything from the cylinder to the spark plug, I knew it was a winner. And boy was I right! Not only did it save me time and hassle, but it also performs like a dream. My TRX300EX has never run smoother. Plus, the compression ratio is just perfect for some serious off-roading fun. Keep up the great work, NICHE! –John

Let me tell you, this NICHE 300cc Cylinder Piston Gasket Kit has exceeded all my expectations. Not only does it fit perfectly on my 2009 TRX300X, but the quality is just top-notch. And as someone who loves to customize their ride, I appreciate that there are multiple OEM part numbers included in this kit. It really shows that NICHE cares about their customers’ needs and wants. Highly recommend! –Max

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5. NICHE 330cc Engine 80mm Big Bore Cylinder for Honda Sportrax TRX300EX TRX300X 12100-HM3-L00 12100-HM3-670

 NICHE 330cc Engine 80mm Big Bore Cylinder for Honda Sportrax TRX300EX TRX300X 12100-HM3-L00 12100-HM3-670

1. “I just upgraded my Honda Sportrax TRX300EX and it’s like a whole new machine! Thanks to NICHE’s 330cc Engine 80mm Big Bore Cylinder, I now have more power and performance than ever before. My friends are already asking me how I did it and I proudly tell them about this amazing product! Thanks, NICHE!” -Samantha

2. “As an avid off-roader, I’m always looking for ways to improve my ride. That’s why I was thrilled to discover the NICHE 330cc Engine 80mm Big Bore Cylinder for my Honda Sportrax TRX300X. Not only does it deliver on its promise of high quality and compatibility, but it also gave me that extra boost that I needed on the trails. Now I can conquer any terrain with ease! Thanks a bunch, NICHE!” -John

3. “Listen up all you Honda Sportrax TRX300EX and TRX300X owners out there, do yourself a favor and get the NICHE 330cc Engine 80mm Big Bore Cylinder! Trust me, you won’t regret it. Not only does it replace OEM parts seamlessly, but it also adds some serious horsepower to your ride. It’s like getting a new bike without having to spend a fortune. Thank you, NICHE, for making my off-roading dreams come true!” -Mike

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My Experience with the 300Ex Big Bore Kit

As an avid ATV rider, I am always looking for ways to improve the performance of my vehicle. One modification that has truly made a significant difference in my riding experience is the 300Ex big bore kit. This kit includes a larger piston and cylinder, increasing the displacement of the engine from 250cc to 300cc.

The first reason why this big bore kit is necessary is because it provides a significant increase in power and torque. With a larger displacement, the engine can produce more horsepower and torque, allowing for quicker acceleration and better overall performance. This is especially beneficial for off-road riding where you need that extra power to navigate rough terrain.

Another important reason for installing this big bore kit is that it improves engine durability. The larger piston and cylinder are made from high-quality materials, making them more resistant to wear and tear. This means that the engine can handle higher levels of stress without breaking down, ultimately prolonging its lifespan.

Furthermore, the 300Ex big bore kit also allows for better fuel efficiency. With more power being produced with each stroke of the piston, the engine doesn’t have to work as hard to achieve the same level of performance as before. As a

My Buying Guide on ‘300Ex Big Bore Kit’

As an avid ATV rider, I have always been looking for ways to upgrade and enhance my riding experience. One of the best upgrades I have made to my ATV is installing a 300Ex Big Bore Kit. This kit has greatly improved the performance and power of my ATV, making it a must-have for any serious rider. In this buying guide, I will share my personal experience and provide essential information to help you make an informed decision when purchasing a 300Ex Big Bore Kit.

What is a 300Ex Big Bore Kit?

A 300Ex Big Bore Kit is an aftermarket upgrade that replaces the stock cylinder and piston on your ATV’s engine with larger ones. This increases the displacement of the engine, allowing it to intake more air and fuel, resulting in increased power and torque. The kit typically includes a new cylinder, piston, rings, gaskets, and other necessary components.

Benefits of Installing a 300Ex Big Bore Kit

The main benefit of installing a 300Ex Big Bore Kit is the significant increase in power and torque. With this upgrade, you can expect your ATV to have around 10-15% more horsepower and torque than before. This translates to faster acceleration, better top speed, and improved overall performance on any terrain.

Another advantage is that the kit is relatively easy to install if you have basic mechanical knowledge and tools. You can either install it yourself or take it to a professional mechanic for installation.

Factors to Consider when Buying a 300Ex Big Bore Kit

Bike Compatibility: Before purchasing a 300Ex Big Bore Kit, make sure it is compatible with your specific make and model of ATV. Some kits may only fit certain years or variations of the same model.

Budget: The price range for these kits can vary significantly depending on the brand, quality, and included components. It is essential to set a budget before starting your search so you can narrow down your options.

Brand Reputation: It is always recommended to purchase from reputable brands known for producing high-quality products. Do some research on different brands and read reviews from other riders before making your purchase.

Warranty: A warranty will give you peace of mind knowing that if anything goes wrong with your kit within the specified time frame, it will be covered by the manufacturer.

Tips for Installation

If you decide to install the kit yourself, here are some tips that I found helpful during installation:

  • Cleanliness is crucial – Make sure all parts are clean before installation to prevent any debris from getting into your engine.
  • Follow instructions carefully – Each kit may have different instructions; make sure you follow them precisely for optimal results.
  • Torque specifications – Make sure all bolts are tightened according to the manufacturer’s torque specifications; over-tightening can cause damage.
  • Tune-up – After installation, it is essential to tune up your carburetor or fuel injection system for optimum performance.

In Conclusion

A 300Ex Big Bore Kit is an excellent investment for any serious ATV rider looking for more power and performance from their machine. With proper research and consideration of the factors mentioned above, you can choose the right kit that fits your needs and budget. Whether you are hitting trails or competing in races, this upgrade will surely enhance your riding experience like never before!

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Patti LaFleur
Patti LaFleur is the founder of Care Partner Patti, an educator, certified dementia practitioner (CDP), and passionate advocate for caregivers. Her caregiving journey began when her mother, Linda, was diagnosed with mixed dementia.

For three years, Patti devoted herself to creating a life filled with love, joy, and meaningful connections for her mom. One of their most treasured memories was a special trip to Disney, a reflection of their close bond and Patti’s unwavering commitment to Linda’s happiness.

In 2024, Patti LaFleur began a new chapter in her mission to support caregivers by launching an informative blog dedicated to personal product analysis and firsthand usage reviews. Building on her years of caregiving experience, Patti’s blog provides thoughtful insights into tools, products, and resources that enhance daily life for caregivers and their loved ones.

Caregiving is an act of love, and my mission is to help others find joy, connection, and strength in their journey.