TRF-Powered
At Castle, they require that you use stock motors in F1. They don't hand out a spec motor. Personally, I think there is nothing more satisfying that to have one of the top drivers get in your face and accuse you of running a mod motor because you were so fricking fast. Then you pull the body pins and lift the body to reveal an unmodified, stock motor. It's all about matched cell batteries and gearing!
