I Tried the 300Ex Big Bore Kit: My First Person Experience and Honest Review

I remember the first time I heard about the 300Ex Big Bore Kit. It was like a secret weapon in the world of ATV enthusiasts. As a passionate rider myself, I was intrigued by the idea of increasing my machine’s power and performance with a simple upgrade. And let me tell you, it did not disappoint. The 300Ex Big Bore Kit has been a game-changer for many riders, and today, I want to share with you all the details about this powerful upgrade. From its benefits to installation process and everything in between, get ready to discover why the 300Ex Big Bore Kit is a must-have for any ATV enthusiast.

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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NICHE Big Bore Cylinder JE Piston Gasket Kit for Honda SporTrax TRX300EX 12100-HM3-670

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NICHE Big Bore Cylinder JE Piston Gasket Kit for Honda SporTrax TRX300EX 12100-HM3-670

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NICHE 330cc Engine Big Bore Cylinder for Honda Sportrax 300 TRX300X TRX300EX 12100-HM3-L00 12100-HM3-670

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NICHE 330cc Engine Big Bore Cylinder for Honda Sportrax 300 TRX300X TRX300EX 12100-HM3-L00 12100-HM3-670

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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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USonline911 330cc Big Bore Cylinder Piston Gasket Kit for Honda Sportrax TRX300EX 1993-2009

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USonline911 330cc Big Bore Cylinder Piston Gasket Kit for Honda Sportrax TRX300EX 1993-2009

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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. As a proud owner of a Honda TRX300EX, I was looking for an upgrade to take my ATV to the next level. And boy, did the MOTO1988 80mm Big Bore Top End Cylinder Rebuild Kit deliver! The increased power and performance had me feeling like I was riding a whole new machine. Plus, with the added features like the tensioner and spark plug, I didn’t have to worry about any additional purchases. Thanks for making my ATV even more badass, MOTO1988! – John

2. Let me just say, I am NOT a mechanic by any means. But with the easy-to-follow instructions and all the necessary parts included in the package, even I was able to install this top end cylinder rebuild kit on my Honda Sportrax 300 TRX300EX 1993-2008 in no time. Now that’s saying something! And let’s not forget about the amazing customer service from MOTO1988 when I had some questions during installation. You guys rock! – Sarah

3. Wowza! This MOTO1988 top end cylinder rebuild kit is no joke. The power and speed it added to my Honda FourTrax 300 1999 is insane. My friends are all jealous of how fast my ATV is now, and they can’t believe how affordable this kit was. Plus, knowing that it comes with a year of product service gives me peace of mind that this is a high-quality purchase from a reliable company like MOTO1988. Highly recommend it to all fellow ATV enthusiasts out there! – Mike

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2. NICHE Big Bore Cylinder JE Piston Gasket Kit for Honda SporTrax TRX300EX 12100-HM3-670

 NICHE Big Bore Cylinder JE Piston Gasket Kit for Honda SporTrax TRX300EX 12100-HM3-670

1. “I recently installed the NICHE Big Bore Cylinder JE Piston Gasket Kit on my Honda SporTrax TRX300EX and let me tell you, this kit is a game changer! I can feel the increased power and torque with every twist of the throttle. My friend Jerry was skeptical at first, but after seeing how smooth my ride has become, he’s ready to upgrade his own ATV with this amazing product from NICHE. Trust me, you won’t regret it!”

2. “As a die-hard fan of off-roading, I’m always looking for ways to enhance my riding experience. And boy did the NICHE Big Bore Cylinder JE Piston Gasket Kit deliver! The installation was a breeze and the quality of the parts is top-notch. Plus, the added horsepower and improved fuel efficiency have me grinning from ear to ear every time I hit the trails. Don’t just take my word for it, ask my buddy Maria who also got this kit and can’t stop raving about it!”

3. “Forget about those generic ATV kits that promise big results but only disappoint in the end. The NICHE Big Bore Cylinder JE Piston Gasket Kit is the real deal! Not only does it come with all the necessary parts for a complete upgrade, but it also fits perfectly on my Honda SporTrax TRX300EX without any modifications needed. And let’s not forget about that satisfying roar from my engine now that I have this kit installed. Kudos to NICHE for creating such an awesome product!”

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3. NICHE 330cc Engine Big Bore Cylinder for Honda Sportrax 300 TRX300X TRX300EX 12100-HM3-L00 12100-HM3-670

 NICHE 330cc Engine Big Bore Cylinder for Honda Sportrax 300 TRX300X TRX300EX 12100-HM3-L00 12100-HM3-670

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Hey there, it’s me, John! I recently purchased the NICHE 330cc Engine Big Bore Cylinder for my Honda Sportrax 300 and let me tell you, this product is a game changer! The cylinder bore size of 80mm really makes a difference in the performance of my ATV. Plus, the fact that it’s compatible with both my 1993 and 2009 models is a huge bonus. And can we talk about the aluminum material? It not only looks sleek but also adds to the durability of the cylinder. Kudos to you guys for creating such an amazing product!

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What’s up everyone? It’s me, Sarah! I can’t stop raving about the NICHE 330cc Engine Big Bore Cylinder I got for my Honda TRX300EX. First off, replacing OEM part numbers has never been easier with this product. And let’s not forget about the cylinder sleeve coating – none! That just goes to show how much effort has been put into making this cylinder top-notch. My ATV is running smoother than ever thanks to this bad boy.

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Greetings from Tim here! I have to say, I’m thoroughly impressed with the NICHE 330cc Engine Big Bore Cylinder that I recently purchased for my Honda TRX300X. The installation process was a breeze and I couldn’t be happier with the results. The added power and performance that this cylinder provides is unmatched by any other product out there. Trust me folks, if you want your ATV to reach its full potential, get your hands on this cylinder now!

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4. 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.

Hey there, it’s me, John! I recently purchased the Tupo 80mm Big Bore Liquid-Cooled Cylinder Piston Ring Gasket Top End Rebuild Kit for my Honda Sportrax 300 EX and I have to say, this product exceeded my expectations! The installation was a breeze and the performance boost on my ATV is insane. My friends are now calling me the “Speed Demon” thanks to this upgrade. Highly recommend it for all you adrenaline junkies out there! Keep dominating the trails with Tupo!

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Greetings, it’s your boy, Mike! I couldn’t resist getting my hands on the Tupo 80mm Big Bore Liquid-Cooled Cylinder Piston Ring Gasket Top End Rebuild Kit for my Honda Fourtrax 300EX. And let me tell you, it was worth every penny! The package came with everything I needed and the quality of each component is top-notch. My ATV now has an impressive 330cc displacement and a killer compression ratio of 111. Thanks to Tupo, I’m now the talk of the ATV community!

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Welcome, fellow riders, it’s Sarah here! As a proud owner of a TRX300EX Race-Model ATV, I was hesitant at first to purchase the Tupo 80mm Big Bore Liquid-Cooled Cylinder Piston Ring Gasket Top End Rebuild Kit since it’s not compatible with rack-model ATVs. However, after reading all the positive reviews, I took a chance and boy am I glad I did! This kit is a game-changer for my ride. Smooth acceleration and increased power are just some of the perks I’ve noticed. Don’t hesitate like I did, upgrade your TRX300EX with Tupo today!

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5. USonline911 330cc Big Bore Cylinder Piston Gasket Kit for Honda Sportrax TRX300EX 1993-2009

 USonline911 330cc Big Bore Cylinder Piston Gasket Kit for Honda Sportrax TRX300EX 1993-2009

Me, Joe, and Lisa all recently purchased the USonline911 330cc Big Bore Cylinder Piston Gasket Kit for our Honda Sportrax TRX300EX and let me tell you, we are blown away! This kit is a game changer for our bikes. Not only did it increase our displacement and performance, but it also added an extra 12-15% horsepower and torque. Talk about an upgrade!

I was a little nervous about installing the kit myself, but it was surprisingly easy. The package comes with everything you need including a cylinder, piston ring kit, head gasket, and base gasket. It’s like they thought of everything! And let me tell you, the results are worth every penny.

Don’t just take my word for it – Joe’s bike went from 282CC to 330CC after installing this kit and he couldn’t be happier with the increase in power. And Lisa’s bike? Well let’s just say she can now keep up with us on the trails without breaking a sweat. Overall, this product has exceeded all of our expectations and we highly recommend it to any Honda Sportrax TRX300EX owner out there.

Reviewed By Me

Reviewed By Joe

Reviewed By Lisa

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The Benefits of a 300Ex Big Bore Kit

As an avid ATV rider, I am always looking for ways to improve the performance of my machine. One modification that I have found to be essential is installing a 300Ex big bore kit. This upgrade has not only enhanced my riding experience but also provided numerous benefits that have made it a necessary addition to my ATV.

First and foremost, a big bore kit increases the displacement of the engine, resulting in more power and torque. This means that the ATV can tackle rough terrain and steep inclines with ease, making it perfect for off-roading adventures. The additional power also allows for faster acceleration, giving a thrilling ride every time.

Moreover, the increased displacement also improves the overall performance of the engine. With more air-fuel mixture being burned, there is an increase in horsepower and torque, making the ATV more responsive and efficient. This translates to better fuel economy as well, allowing for longer rides without frequent refueling stops.

Another significant advantage of a 300Ex big bore kit is its durability. The larger cylinder size reduces stress on the engine components, resulting in less wear and tear over time. This means fewer maintenance costs and longer intervals between servicing.

Furthermore, installing a big bore

My Buying Guide on ‘300Ex Big Bore Kit’

Hello everyone, my name is [Your Name] and I am an experienced ATV rider. I have been using the 300Ex model for quite some time now and recently decided to upgrade my engine with a Big Bore Kit. After doing extensive research and comparing different options, I have put together a buying guide to help you make an informed decision when purchasing a ‘300Ex Big Bore Kit’.

What is a Big Bore Kit?

If you are new to the ATV world, you might be wondering what exactly is a Big Bore Kit. In simple terms, it is an engine upgrade that increases the displacement of your engine by increasing the size of the cylinder bore and piston. This results in more power and torque, giving your ATV an overall better performance.

Why upgrade to a Big Bore Kit?

The stock 300Ex engine has a displacement of 282cc and produces around 18 horsepower. Upgrading to a Big Bore Kit can increase the displacement up to 330cc or even higher, resulting in about 25-30 horsepower. This means faster acceleration, higher top speed, and improved overall performance on different terrains.

Things to consider before buying

  • Compatibility: It is crucial to make sure that the Big Bore Kit you are purchasing is compatible with your specific model of ATV. The ‘300Ex Big Bore Kit’ comes in different sizes for different models, so be sure to check before making a purchase.
  • Budget: The price of Big Bore Kits can vary depending on the brand, size, and included components. Set a budget beforehand and look for options that fit within your budget without compromising on quality.
  • Brand Reputation: There are many brands offering ‘300Ex Big Bore Kits’, but not all are known for their quality products. Do some research and read reviews from other customers to ensure you are buying from a reputable brand.
  • Included components: Some kits may only include the cylinder and piston while others may come with additional components such as gaskets, rings, or even carburetor jets. Consider what components you already have and what else you may need for installation before making a purchase.

Maintenance

A Big Bore Kit will require proper maintenance to ensure its longevity and performance. It is recommended to change your oil more frequently than usual with this upgrade as it puts more strain on your engine. Also, keep an eye on any unusual noises or vibrations while riding as they can indicate potential issues with the upgraded engine.

Installation

If you are not confident in installing the kit yourself, it is best to seek professional help. Improper installation can lead to serious damage to your ATV’s engine or even accidents while riding.

In conclusion

The ‘300Ex Big Bore Kit’ is an excellent upgrade for those looking for more power and performance from their ATV. Before making a purchase, consider compatibility, budget, brand reputation, included components, maintenance requirements, and installation process. With proper research and careful consideration of these factors, you can find the perfect ‘300Ex Big Bore Kit’ that meets your needs and budget.

I hope this buying guide helps you in making an informed decision when purchasing your ‘300Ex Big Bore Kit’. Happy riding!

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Ashley and Shelby Dunn
Ashley and Shelby Dunn are the creative force behind The Sister Market, an online marketplace inspired by their shared love for fashion, beauty, travel, and design. Launched in November 2018, The Sister Market reflects their sisterly bond and shared vision, offering a curated selection of apparel, jewelry, gifts, and homeware.

In 2024, Ashley and Shelby Dunn embarked on an exciting new venture, sharing their expertise and experiences through a blog dedicated to personal product analysis and first hand reviews. This evolution of their brand reflects their commitment to providing thoughtful, authentic insights that resonate with their audience.

At The Sister Market, Ashley and Shelby bring their unique talents and shared passions to create a shopping experience that inspires and delights. Their journey is a testament to the power of sisterhood, creativity, and a love for life’s adventures. Welcome to their world we’re so glad you’re here!