Athena 304CC Kit YZ250F & YZ250FX 2019-2023 85mm bore

Athena 304CC Kit YZ250F/FX 2019-2023 85mm bore

Increase your Yamaha YZ250F to 300cc for significant torque gains. Complete big bore kit for 2019-2023 delivers more power across the entire power range with fantastic engineering from Athena for excellent reliability. 

Key Features

• 300cc Displacement: Substantial increase over stock
• Complete Kit: Cylinder, piston, gaskets included
• Nikasil Coating: Factory-quality bore treatment
• Quality Construction: Designed for reliability

Performance Benefits

• Significantly more torque
• Stronger low-to-mid acceleration
• Easier power delivery
• Improved drive
• Now Included with GET Boost Module

It's highly recommended to use a stand alone ECU properly tuned for the overbore.  We have RX1 ECU Units available with custom mapping we  developed with Cody Webb that make this kit a true performance powerhouse!

Athean P/N P400485100105