This Athena 300cc Big Bore Cylinder Kit is engineered for KTM, Husqvarna, and GasGas 250cc four-stroke models from 2019 to 2023. Designed to increase displacement from 250cc to 300cc, it includes a complete cylinder assembly with piston, gasket set, and the GET Boost electronic module for optimized engine performance without requiring ECU reprogramming.

Features

• Increases displacement to 300cc for enhanced power and torque

• Includes aluminum cylinder with 85 mm steel liner

• High-performance forged piston with DLC-coated wrist pin and circlips

• Complete gasket set with MLS head gasket

• GET Boost electronic module with preloaded 300cc fuel map

• Plug-and-play installation with no ECU reflash required

• Developed for motocross and enduro applications

Specifications

• Manufacturer: Athena

• Part Number: P400270100025

• Bore Size: 85 mm

• Displacement: 300 cc

• Cylinder Material: High-silicon aluminum alloy with co-fused steel liner

• Piston: Forged aluminum with molybdenum disulfide coating

• Wrist Pin: Aerospace-grade steel, DLC-coated

• Electronics: GET Boost module with pre-installed map

• Gasket Type: Multi-Layer Steel (MLS) head gasket

Vehicle Fitments

• GasGas EX F 250 cc 2021–2023

• GasGas MC F 250 cc 2021–2023

• Husqvarna FC 250 cc 2019–2022

• KTM SX-F 250 cc 2019–2022

• KTM XC-F 250 cc 2019–2022