Athena Piston Kit, 1.770 in Bore for GasGas, Husqvarna and KTM (S4F04500001A)

The ATHENA S4F04500001A Piston Kit is engineered for compatible GasGas, Husqvarna, and KTM engines requiring a high-quality replacement piston for the original-equipment cylinder. Designed to support dependable performance in demanding off-road and racing applications, this piston kit is built to withstand mechanical and thermal stress while maintaining consistent operation under challenging conditions.
ATHENA tested this piston on engine dynamometer benches using progressively increased stress loads, then validated its performance on the track in extreme operating conditions. This development process helps ensure the S4F04500001A delivers the durability, strength, and reliability expected from a performance-oriented replacement component. Its reverse-extruded construction provides a precise, robust piston design intended for use with the OE cylinder.
The kit includes piston rings engineered to help reduce friction against the original-equipment cylinder. Lower friction can support smoother piston movement, improved efficiency, and enhanced engine response while helping preserve reliable operation. The ATHENA piston kit is a practical choice for rebuilding or servicing compatible GasGas, Husqvarna, and KTM engines when fitment with the OE cylinder is required.
Before installation, verify vehicle compatibility and confirm that the original-equipment cylinder, piston clearance, ring end gap, and related components meet the manufacturer’s specifications. Professional installation and proper break-in procedures are recommended for best results.

Features:

• High resistance to mechanical and thermal stresses for demanding engine applications

• Tested on engine dynamometer benches under progressively increased stress loads

• Track validated for performance in extreme operating conditions

• Reverse-extruded construction designed for use with the original-equipment cylinder

• Includes piston rings engineered to reduce friction against the OE cylinder

• Designed for compatible GasGas, Husqvarna, and KTM engines

Ships from Parts Unlimited.