See: Yokomo

Yokomo have introduced their new generation of Racing Performer M4 brushless motors optimized and designed for the Stock and Modified classes. The motor features an open stator design to maximize cooling performance and also to give max power from the start to the end of the race. The M4 will be available in Modified version with the extreme high power 3.5T and 4.5T motors offering superior performance compared to the M3 series and also in JMRCA Stock Spec with 13.5T and 21.5T motors. These motors come with a specially designed stator which produces a smoother and more powerful acceleration feeling. The M4 motors will be available at the end of July.