The Yokomo B10-302MBA is a solid brass center motor mount made for the BD10 on-road chassis family. As an RC-scale tuning part, it replaces the centre motor mount with a heavier brass unit to add mass without moving external ballast that can upset chassis balance.
Swapping the quoted aluminium mount for the brass B10-302MBA raises the motor-mount mass from the aluminium figure of 16g to roughly 50g of brass, a net gain of about 34g. Because the mount sits at the machine centerline, the added mass helps reach minimum race weight while preserving left-right balance and predictable handling.
Installation is a straightforward direct replacement for the BD10 series motor mounting points; the part is intended to work with the listed BD10 variants and to give racers and tuners a way to adjust vehicle weight distribution without using asymmetric ballast.
For BD10 chassis users wanting a simple central mass option to meet race weight targets, the B10-302MBA is a direct-fit brass mount that preserves motor alignment and maintains chassis balance compared with externally mounted ballast.
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