Honda Fourtrax 300 Big Bore Kit: A Complete Guide


In this article, we will discuss all the important aspects of the Honda Fourtrax 300 Big Bore Kit. From understanding what a big bore kit is to how it can enhance your ATV’s performance, we will cover it all. Whether you are considering upgrading your Honda Fourtrax 300 or simply want to learn more about big bore kits, this guide is for you.

What is a Big Bore Kit?

A big bore kit is an aftermarket upgrade that increases the displacement of an engine, resulting in improved performance. In the case of the Honda Fourtrax 300, a big bore kit can increase the ATV’s horsepower and torque, making it more powerful and responsive.

By installing a big bore kit, you can expect to see substantial gains in performance, especially in terms of top speed and acceleration. This upgrade is popular among ATV enthusiasts who want to take their off-road adventures to the next level.

Why Consider a Big Bore Kit for Your Honda Fourtrax 300?

There are several reasons to consider a big bore kit for your Honda Fourtrax 300. Firstly, it can significantly increase the power and performance of your ATV. Whether you use your ATV for recreational riding or heavy-duty work, a big bore kit can make a noticeable difference in how it performs.

Additionally, a big bore kit allows you to customize your ATV to better suit your specific needs and riding style. By increasing the engine displacement, you can tailor the power delivery to better match your riding preferences, whether that be for conquering challenging terrain or hauling heavy loads.

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How to Install a Big Bore Kit on Your Honda Fourtrax 300

While installing a big bore kit may seem like a daunting task, it is certainly achievable for those with basic mechanical skills and the right tools. The process involves disassembling the engine, removing the stock cylinder, and replacing it with the larger bore cylinder included in the kit.

It is important to follow the manufacturer’s instructions carefully and take your time to ensure everything is installed correctly. If you are not confident in your abilities, it is always best to seek professional assistance to avoid any potential issues.

What to Expect After Installing a Big Bore Kit

After installing a big bore kit on your Honda Fourtrax 300, you can expect a significant increase in power and torque. This will translate to improved acceleration, higher top speeds, and overall enhanced performance.

It is important to note that with increased power comes the need for additional maintenance and care. Be sure to keep up with regular maintenance intervals and monitor your ATV’s performance closely after the installation of a big bore kit.


Upgrading your Honda Fourtrax 300 with a big bore kit can be a game-changer in terms of performance and riding experience. Whether you are an avid ATV enthusiast or simply want to get more out of your machine, a big bore kit is definitely worth considering.


1. Can I install a big bore kit on my Honda Fourtrax 300 myself?

While it is possible to install a big bore kit on your own, it is recommended to have at least some experience with ATV maintenance and repair. If you are not confident in your abilities, it is best to seek professional assistance to ensure the installation is done correctly.

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2. Will installing a big bore kit void my ATV’s warranty?

It is important to check with your ATV’s manufacturer and review the terms of your warranty before installing a big bore kit. Some manufacturers may void the warranty if aftermarket modifications are made, so it is best to be aware of any potential implications.

3. How much horsepower increase can I expect from a big bore kit?

The exact increase in horsepower will depend on the specific kit and modifications made to your Honda Fourtrax 300. However, it is not uncommon to see gains of 10-20% in horsepower after installing a big bore kit.

4. Will I need to make any other modifications after installing a big bore kit?

Depending on the specific kit and your riding preferences, you may need to make additional modifications such as upgrading the exhaust system, adjusting the fuel delivery, or upgrading the suspension to fully optimize the enhanced performance of your ATV.

5. Are big bore kits legal for use on public trails and roads?

It is important to check your local regulations and laws regarding ATV modifications before installing a big bore kit. Some areas may have restrictions on aftermarket upgrades, so be sure to research the legality of using a big bore kit on public trails and roads.


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