The Yokomo Z4-003S High-Flex Upper Deck (CG) is an RC-scale replacement upper deck engineered for the YZ-4 4WD off-road car. Made from graphite and featuring a central slit, the part increases chassis flex compared with the standard upper deck to produce easier-to-handle responses.
Functionally, the central slit concentrates bend in the deck so weight transfer and chassis roll become more progressive. That change helps stabilise the car during cornering and when negotiating narrow gaps, making this deck a practical tuning option when track surfaces are loose, rough, or otherwise uneven.
Installation notes: the component is intended for the YZ-4 upper deck position, and careful alignment of mounting points is recommended during fitment. As with any tuning change, evaluate handling in small steps and adjust other suspension or weight settings to match the increased flexibility.
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