This aluminium rear suspension mount is an optional upgrade for the 4WD YZ-4 platform, intended for use with the L5 suspension arm. The mount's rear-side suspension pin spacing is 2mm narrower than the standard rear mount, a dimensional change that adjusts rear geometry without modifying the arm.
Paired with the front-side rear suspension mount Z4-300LRF and the 1mm longer L5 arm Z4-008RS5, the combination allows track width adjustment while retaining the longer arm length. On high-traction carpet or artificial turf the mount promotes a controlled amount of chassis roll even with firmer suspension, which can help improve turn-in responsiveness.
To fine-tune front-to-rear balance, fit the 1mm longer front suspension arm Z4-008F1 for additional weight transfer and sharper initial turn-in. This note describes RC-scale parts and setup considerations only.
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