ATHENA Big Bore 293CC Cylinder Kit 72mm 16.4:1 with Exhaust Valve Kit for Yamaha YZ 250

The ATHENA Big Bore Thermal Group of 293 cc, with a bore of 72 mm, represents an excellent choice for those looking to enhance the performance of their motorcycle. With an increase of 5.6 mm compared to standard models, this thermal group offers a significant increase in displacement, allowing for greater thrust and a more responsive acceleration.

The compression ratio of 16.4:1 is designed to optimize engine efficiency, ensuring a perfect balance between power and control. The new version of the exhaust valve kit included in the package is designed to further improve exhaust gas flow, contributing to more efficient combustion and superior performance.

• Displacement: 293 cc
• Bore: 72 mm
• Increase compared to standard models: 5.6 mm
• Compression ratio: 16.4:1
• Exhaust valve kit included
• Optimization of exhaust gas flow
• More efficient combustion

Whether you are a motor enthusiast or a professional in the field, the ATHENA Big Bore Thermal Group represents an ideal option for those looking to elevate their vehicle to a new level of performance.

WARNING: The cylinder head and base gaskets included in the kit are expressly developed for ATHENA thermal groups. Whenever the thermal group is disassembled, replace the gaskets with the specific ATHENA replacement series: DO NOT use original replacement gaskets.