Hammerhead Engine Top End Assembly, 61mm (171cc) for GY6, 150cc

The Hammerhead 61mm Big Bore Cylinder Kit is a powerful 171.3cc bolt-on kit that boosts the performance of 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.