NCY Cylinder Kit (Aluminum, 61mm, 171cc); Genuine/GY6

NCY 61mm Big Bore Cylinder Kit fits GY6-based 125cc / 150cc engines.

Enhance your GY6-based scooter’s performance with this powerful 171.3cc bolt-on kit designed for most GY6 125/150cc engines. As far as we know, this is the only 61mm cylinder kit available for the GY6 engine in the US.

Unlike most 61mm cylinder kits, which require modifications to the engine cases for installation (Outer Cylinder Skirt Diameter: 65mm), this big bore cylinder and piston kit fits without any cutting (Outer Cylinder Skirt Diameter: 62.9mm).

The big bore kit features a lightweight cut-down piston that enhances performance further. It is highly recommended to jet this kit significantly richer due to its high-performance capabilities. To optimize both performance and efficiency, consider upgrading to our 61mm big valve head, as some stock heads may not be compatible.

Have a look at our Decompression Tube Assembly, which replaces your dipstick and allows excess crank case pressure to be released. It’s a good idea to install one of these alongside any cylinder kit upgrade.

Specifications:

• Designed for GY6 125/150cc engines
• Size: 62.9mm Outer Cylinder Skirt Diameter
• Bore: 61mm
• Wrist pin and clips included
• Piston and Rings included
• Base gasket and head gasket included

Note: Does not include head assembly.

Visit our NCY Performance Parts page to shop all performance upgrades available for your vehicle.

About NCY:  NCY stands as the premier provider of aftermarket performance components for leading scooter brands such as Honda, Yamaha, Genuine, Vespa, Piaggio, SYM, Lance, KYMCO, and GY6/QMB powered scooters. Established in 1997, NCY adheres to rigorous quality standards and holds ISO 9001 certification. 

NCY performance parts are made in Taiwan.

Not legal for use in California on pollution controlled vehicles. Check local laws before installing.

This product is not intended for use on public roads or land.