Athena Piston Kit, 2.124 in. for Gas Gas, Husaberg, Husqvarna and KTM (S4F05400003B)

The Athena S4F05400003B Piston Kit is engineered for reliable performance in high-demand off-road and racing applications. Designed for compatible Gas Gas, Husaberg, Husqvarna and KTM engines, this piston kit is built to withstand significant mechanical and thermal stress while maintaining dependable operation under challenging conditions. Its 2.124-inch piston size is designed for use with the original equipment cylinder, supporting a precise fit and consistent engine performance.
The Athena piston has been tested on engine dynamometer benches using progressive stress loads and subsequently validated on the track. This testing process helps confirm durability and performance in demanding operating conditions, from sustained engine loads to extreme riding environments. The piston is manufactured using a reverse-extrusion process that supports structural consistency and strength for long-term service.
Included piston rings are designed to reduce friction against the OE cylinder, helping improve efficiency, throttle response and overall engine performance. The result is a replacement piston kit that supports smooth operation while maintaining the fit and function expected from a quality engine component. Use the Athena S4F05400003B part number when selecting the correct replacement for your compatible application.
Feature: High resistance to mechanical and thermal stresses.
Feature: Tested on engine dynamometer benches under progressive stress loads.
Feature: Track-tested for performance in extreme conditions.
Feature: Includes piston rings designed to reduce friction with the OE cylinder.
Feature: Manufactured using a reverse-extrusion process.
Feature: Designed for use with the original equipment cylinder.

Features:

• High resistance to mechanical and thermal stresses

• Tested on engine dynamometer benches under progressive stress loads

• Track-tested for performance in extreme conditions

• Piston rings designed to reduce friction with the OE cylinder

• Manufactured using a reverse-extrusion process

• Designed for use with the original equipment cylinder

Ships from Parts Unlimited.