Vintage Stage 1 88cc Big Bore Kit for Honda Z50, CT70, ATC70, TRX70, SL70, XL70

Unlock More Power: Vintage Honda 88cc Stage 1 Big Bore Kit Revitalize your classic Honda Z50, CT70, ATC70, TRX70, SL70, or XL70 with our Stage 1 Big Bore Kit. This upgrade is engineered to deliver a noticeable power boost without breaking the bank, making it the perfect choice for riders seeking enhanced performance on their vintage machines. Designed for straightforward installation, this kit is ideal for those with basic mechanical knowledge ready to take on a rewarding DIY project.

What’s in the Box (Based on selected options)

Why Riders Upgrade

Big Bore Kit vs. Stock Engine

Common Questions

What is a big bore kit?
A big bore kit increases the displacement of an engine by increasing the bore (diameter) of the cylinders and often the stroke of the piston. This leads to more air and fuel mixture being burned per combustion cycle, resulting in more power.

Can I use this kit on my specific Honda model?
This kit is designed for vintage Honda models including the Z50, CT70, ATC70, TRX70, SL70, and XL70. Always double-check compatibility with your exact model year.

Do I need to use race gas with this kit?
No, this kit is designed to run on standard pump gas. The high compression piston is optimized to work with readily available fuel.

Is this kit difficult to install?
While it requires basic mechanical skills, the kit is designed for straightforward installation. Clear instructions are provided to guide you through the process.

What Riders Are Saying

This kit was a game-changer for my old Z50. The installation was surprisingly simple, and the power increase is undeniable. It feels like a completely new bike!
— John D., California

I was hesitant to modify my vintage CT70, but this big bore kit was worth every penny. The instructions were clear, and the performance boost is significant. Highly recommended for anyone looking to get more out of their classic Honda.
— Mark T., Texas