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

The NCY 61mm Big Bore Cylinder Kit is a powerful 171.3cc bolt-on kit that boosts the performance of most GY6-based 125cc and 150cc engines.

Benefits:

1. This is the only 61mm cylinder kit available in the U.S. for GY6 engines (as far as we know).
2. The smaller outer cylinder skirt diameter (62.99mm versus the 65mm of other kits) means no cutting or modifications of the engine case are necessary.
3. The lightweight, cut-down piston further enhances performance.

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.

Additional Recommendations: 

• We recommend jetting 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.

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

About NCY: NCY is the aftermarket performance parts leader for most popular scooter brands including Honda, Yamaha, Genuine, Vespa, SYM, Lance, KYMCO, and GY6 / QMB powered scooters. Made in Taiwan with strict quality standards since 1997, NCY is ISO 9001 certified.

Made in Taiwan.

This product is intended for off-road use only.

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

This product is not legal for use in California on pollution-controlled vehicles. Check local laws before installing.

*Performance upgrades are considered racing parts and are not covered by warranty.