Yokomo BD9 MID Topdeck 2.0mm by Arrowmax AM-910020  [AM-910020]

Topdeck for Yokomo BD9

This Arrowmax AM-910020 topdeck is an RC-scale replacement part specified for the Yokomo BD9 MID layout, listed at a 2.0mm thickness. It serves as the upper chassis plate that links front and rear bulkheads and contributes to the overall torsional stiffness of the touring car chassis.

The design purpose is tuning‑oriented: by changing topdeck thickness and stiffness drivers can influence mid-corner balance and transient response without altering suspension geometry. Use this topdeck as a direct swap where the BD9 MID topdeck is specified, keeping mounting points aligned with the original chassis.

Installation is straightforward for standard BD9 MID setups—remove the existing topdeck, align the mounting holes and fasten screws evenly to maintain planarity. For setup work, compare handling changes incrementally when swapping topdecks and record results to isolate effects on understeer, oversteer, and straight-line stability.

As an option part for the Yokomo BD9 MID chassis, this topdeck is intended for hobbyists who approach setup as a gradual process; use it to evaluate changes in chassis stiffness and on-track behaviour as part of a structured tuning program.