Drive Gear for B-MAX4 Input Shaft BM-504 by Yokomo  [BM-504]

Replacement drive gear for B-MAX4 input shaft

The Yokomo BM-504 drive gear with header card is a direct replacement designed for the input shaft on B-MAX4 chassis parts. Supplied as a pair, this RC-scale accessory makes routine part swaps and simple repairs faster at the bench or trackside.

As fitted, the gear mounts on the input shaft and transmits torque through the gearbox train; the header card aids inventory and part identification. Installation requires basic transmission disassembly to remove the old gear and seat the new gear on the input shaft while keeping original spacers and alignment intact.

Use this component when worn teeth need replacement or to keep a matched spare set available. It suits hobbyists running scheduled gearbox checks, quick swaps between sessions, or minor repair work.