Inexpensive way to Change a 50cc Scooter to a 100cc Scooter

Inexpensive way to Change a 50cc Scooter to a 100cc Scooter

Inexpensive way to Change a 50cc Scooter to a 100cc Scooter

If you own a 50cc scooter and are looking to increase its power and performance without breaking the bank, upgrading to a 100cc scooter may be the perfect solution. While the process may sound complicated and expensive, there is actually a cost-effective way to achieve this upgrade - by installing a big bore kit.

What is a Big Bore Kit?

A 100cc big bore kit for 50cc scooters is an aftermarket modification that increases the displacement of an engine, allowing it to produce more power. In the case of a scooter, a big bore kit replaces the stock cylinder and piston with larger ones, effectively increasing the engine's capacity from 50cc to 100cc or more.

By increasing the displacement, a big bore kit allows more air and fuel mixture into the combustion chamber, resulting in improved performance and acceleration.

The Benefits of Installing a Big Bore Kit

Upgrading your 50cc scooter to a 100cc scooter has several advantages:

  • Increased Power: A big bore kit can significantly increase your scooter's horsepower and torque, providing a noticeable boost in performance.
  • Better Acceleration: With the increased power, you'll experience quicker acceleration, making your scooter more responsive and fun to ride.
  • Improved Top Speed: The larger displacement allows your scooter to reach higher speeds, giving you the ability to keep up with traffic more easily.
  • Cost-Effective: Compared to purchasing a new 100cc scooter, installing a big bore kit is a much more affordable option.

How Does a Big Bore Kit Work?

A big bore kit works by increasing the size of the cylinder and piston in your scooter's engine. The stock cylinder and piston of a 50cc scooter have a certain volume, which limits the amount of air and fuel mixture that can enter the combustion chamber. By replacing these components with larger ones, the overall displacement of the engine is increased, allowing for more air and fuel to be drawn in.

With a larger displacement, the engine can burn more air and fuel, resulting in increased power output. This leads to improved acceleration and a higher top speed.

Installation Process

Installing a big bore kit requires some mechanical knowledge and experience. If you're not confident in your abilities, it's best to seek professional help. Here's a general overview of the installation process:

  1. Start by removing the necessary components to access the engine, such as the body panels and exhaust system.
  2. Next, remove the stock cylinder and piston assembly. This may involve disconnecting the carburetor, exhaust, and various other components.
  3. Clean the engine block thoroughly to remove any debris or residue.
  4. Install the new cylinder and piston from the big bore kit. Make sure to follow the manufacturer's instructions and torque specifications.
  5. Reassemble the remaining components, ensuring everything is properly connected and tightened.
  6. Once everything is back together, start the scooter and let it idle for a few minutes to ensure everything is functioning correctly.
  7. Take your scooter for a test ride and monitor its performance. You may need to make adjustments to the carburetor or ignition timing to optimize the engine's performance.

Considerations Before Installing a Big Bore Kit

Before diving into the big bore kit installation process, there are a few things you should consider:

  • Legal Restrictions: Check your local laws and regulations regarding engine modifications. Some areas may have restrictions on engine displacement, and modifying your scooter may render it illegal for road use.
  • Warranty Void: Installing a big bore kit will likely void any existing warranty on your scooter. Make sure you are willing to take on this risk before proceeding.
  • Technical Expertise: While installing a big bore kit is relatively straightforward for those with mechanical knowledge and experience, it may be challenging for beginners. If you're not confident in your abilities, it's best to seek professional help.
  • Performance Upgrades: Keep in mind that simply installing a big bore kit may not be enough to fully optimize your scooter's performance. Other upgrades such as a high-flow air filter, performance exhaust, and tuning the carburetor may be necessary to achieve the best results.


If you're looking to upgrade your 50cc scooter to a 100cc scooter without breaking the bank, installing a big bore kit is a cost-effective solution. With increased power, better acceleration, improved top speed, and affordability, a big bore kit can transform your scooter's performance. Just make sure to consider any legal restrictions, warranty implications, and your own technical expertise before embarking on this modification. Remember to consult the manufacturer's instructions and seek professional help if needed for a successful installation.

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