YOKOMO BD9 Mid-Motor Tuning Kit - Arrowmax AM-910003  [AM-910003]

BD9 mid-motor conversion summary

Arrowmax offers a conversion kit that reconfigures the Yokomo BD9 chassis into a mid-motor layout so competitors can dial in different handling characteristics. The kit groups the parts that affect motor location, upper deck layout, pulley geometry and chassis stiffness enabling controlled testing of flex and balance while keeping the BD9 drivetrain intact.

Core components mentioned in the release are a choice of a 2.25mm carbon fibre chassis or a 2.0mm 7075 alloy chassis, a 2.0mm carbon fibre upper deck, a 7075 single-piece motor mount and redesigned 7075 centre pulleys, plus a chassis stiffener to tune flex. Switching to mid-motor influences steering response, traction and corner speed on BD9 setups.

The kit is suited to tuners wanting to explore weight transfer and chassis flex on BD9s, for instance to increase front end rotation or to stabilise exit traction. Fitment follows standard BD9 teardown to replace the main chassis and motor mount and to realign pulley and belt paths for the mid-motor configuration.

Intended for BD9 owners who want to trial mid-motor geometry and flex settings without fabricating bespoke components, the kit supplies a coherent set of structural and drivetrain parts for methodical setup work.