Kyosho LA412 - Rear Upper Bulk (ZX7.5)  [KY-LA412]

Rear upper bulk for Lazer ZX7.5

This rear upper bulk is an RC-scale replacement component for the Lazer ZX7.5 platform, supplied as Kyosho part LA412. It functions as the upper rear bulkhead that locates suspension arms and supports link mounting points on the rear end of the chassis.

Compatibility is focused on the Lazer ZX7.5 chassis configuration, where precise fit and alignment matter for predictable suspension movement. The part replaces the factory rear upper bulk and restores correct geometry where wear or damage has affected handling.

Installation is straightforward for hobby-grade maintenance: remove the rear body mounts and associated fasteners, detach the old bulkhead, position the LA412 bulk in place, verify link alignments and reinstall hardware with moderate tightening to avoid thread damage. Inspect surrounding mounting points and fasteners after the first test run.

Tuning role: the rear upper bulk defines upper link positions and contributes to roll-center and camber response. Using a sound replacement bulkhead helps maintain consistent suspension geometry, making small changes to link lengths or mounting positions more repeatable during setup sessions.

Use this part when restoring correct rear suspension geometry or when a damaged bulkhead needs replacement to preserve predictable chassis balance and tuning response.