This is Big Bore Extreme by Athena. A new generation of cylinder kits, designed to push a 250 platform beyond limits — up to and over 300cc. More torque. More response. More engine in every throttle. Tested on track. Refined in the workshop. Built from over 50 years of engineering experience.
Athena products available at Innteck-USA. Visit www.innteck-usa.com