YZ-4S Left Aluminum Rear Bulk Head for B-YZ4SF - S4-002BRLA by Yokomo  [S4-002BRLA]

YZ-4S Left Rear Bulk Head - Aluminum Upgrade

This left-side aluminum rear bulk head is made for the Yokomo YZ-4S lineup and is supplied under the model S4-002BRLA. It replaces the factory left rear bulk head to deliver a firmer rear mounting point while preserving the original attachment geometry.

Compatibility is centred on YZ-4S versions and the noted B-YZ4SF chassis codes; verify your chassis number before you fit this component. The part is CNC machined from aluminium to increase rigidity and improve resistance to wear compared with the standard plastic unit.

From a setup perspective, swapping the stock plastic left rear bulk head to a metal unit raises rear-end stiffness and alters how the rear suspension transmits loads into the chassis. Use S4-002BRLA when seeking steadier rear traction and a more solid rear mounting platform for mid to high grip conditions.

This aluminium left rear bulk head suits drivers wanting a rigid rear mounting location on YZ-4S based cars, and it installs without changing the chassis' original attachment points.