Yokomo BD9 Touring Chassis Reinforcement Plate - Arrowmax AM-900004  [AM-900004]

BD9 chassis reinforcement in magnesium

This Arrowmax magnesium stiff plate has been developed for the Yokomo BD9 1/10 touring car chassis. Its primary aim is to increase chassis rigidity so suspension and weight adjustments deliver a more consistent reaction. The following sections cover where this plate sits in a tuning plan, fitment checks, and the predictable handling changes to expect on track.

Role and compatibility: intended for the Yokomo BD9 platform, the plate replaces or supplements the stock lower or upper chassis piece depending on your BD9 version, reducing flex and improving steering precision. Installation tips: the unit mounts to existing BD9 locations and works with original hardware; transfer screws and spacers, and ensure each mount lines up before final tightening. Setup advice: a stiffer chassis usually produces a faster initial turn and steadier mid-corner grip, so review damper settings and anti-roll bar choices to rebalance the car.

Fitment notes

Designed specifically for the Yokomo BD9 series; check which BD9 variant you have so the plate mounts in the correct orientation and uses the right hardware.

Neutral and technical, the Arrowmax AM-900004 magnesium plate is a no-nonsense tuning part for racers aiming to reduce chassis flex and make handling more repeatable on Yokomo BD9 cars.