Cylinder kit ATHENA P400270100030 Big Bore d65 mm, 156,6 cc to increase performance

Upgrade your KTM Duke 125 2011–2016 with the Athena 156.6 cc Big Bore Cylinder Kit featuring GET Boost technology, engineered to deliver stronger mid-range torque, faster throttle response, and a more responsive riding experience while maintaining everyday reliability and rideability.

Specifically developed for KTM Duke 125, this Athena Big Bore kit enhances the character of the stock engine by increasing displacement and improving acceleration, roll-on performance, and overall power delivery for both street and sporty riding applications.

Increased Performance for KTM Duke 125

The kit increases engine displacement to 156.6 cc through a larger bore cylinder manufactured from high-silicon aluminum alloy, designed to provide excellent heat dissipation, dimensional stability, and long-term durability under demanding riding conditions.

The high-performance forged piston is CNC machined to ensure reduced friction, optimized weight, and superior mechanical strength. Combined with the dedicated piston rings and heavy-duty wrist pin, the package maximizes combustion efficiency and throttle responsiveness throughout the rev range.

The result is a smoother, stronger, and more engaging KTM Duke 125 with improved mid-range power and noticeably quicker acceleration.

GET Boost Electronic Module Included

The Athena Big Bore kit includes the GET Boost electronic module developed by GET, Athena’s electronics division. The module comes pre-configured specifically for the 156.6 cc setup and optimizes engine management without requiring replacement of the stock ECU.

Its dedicated mapping is engineered to fully support the increased displacement while maintaining safe operating parameters, consistent performance, and excellent rideability.

Plug-and-Play Installation

The GET wiring harness connects directly to the original injector and throttle body connectors for fast, non-invasive plug-and-play installation. The kit also includes all required gaskets for professional assembly according to OEM engine tolerances.

Racing-Derived Athena Technology

Every component is manufactured according to Athena’s high-quality production standards and benefits from extensive experience gained in professional racing environments.

The Athena 156.6 cc Big Bore Cylinder Kit with GET Boost is the ideal performance upgrade for riders looking to unlock the full potential of the KTM Duke 125 2011–2016 with a reliable, race-developed solution.

NOTES: Race Use Only Product – Not intended for street use – Please check details on the “Race use only” footer’s section

WARNING: the cylinder head and base gaskets contained in the kit are specifically developed for Athena cylinders kits. Whenever the cylinder kit is disassembled, replace the gaskets with the specific Athena spare gasket kit: DO NOT use OE replacement gaskets.