The YUASA YT7B-BS works for the Rotax FR125, IAME, and PRD Fireball TAG Motors. We have tested and used several batteries and this has been the most reliable when maintained properly. For ultimate reliability and longevity download the Battery Maintenance FAQ Sheet
The YUASA Battery is approved for the Rotax Max Challenge. We highly recommend this battery over the stock Fiam Rotax battery. Don't forget the Battery Tabs
to hook directly to your Rotax or PRD Fireball wiring harness.