Yokomo S4-300RFA Precision Aluminum Rear Suspension Mount for YZ-4S  [S4-300RFA]

Yokomo S4-300RFA Aluminum Rear Suspension Mount (Front) for YZ-4S
Price:
CAD$23.83
Brand:
Yokomo
Model:
S4-300RFA
GTIN:
0639342188185
Condition:
Brand New
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Durable Aluminum Rear Mount for YZ-4S

The Yokomo S4-300RFA Aluminum Rear Suspension Mount is built to boost the resilience of your YZ-4S. Machined from robust aluminum, this rear mount replaces the factory resin bush (S4-300BS) and gives cleaner alignment options and improved resistance to wear. Racers can use the extra stiffness and adjustment range to refine handling across a variety of indoor and outdoor circuits.

Features and Model Fit

This mount fits multiple Yokomo kits including B-YZ4SF, B-YZ4SF2-1, MOR-010, and MOR-020, making it a practical upgrade for drivers seeking consistent performance. The aluminum construction helps deliver repeatable results compared to standard resin parts, while preserving the original mounting geometry.
Remark :
Due to limited stock availability, please notice that some Yokomo items may have to order from the factory and the ready time is around 4-6 weeks. Customer purchases the item is assumed to accept the waiting time which allows us to order directly from the manufacturer if the item is out of our warehouse.

How will this mount change handling on my YZ-4S?

The stiffer aluminum mount reduces flex where the rear hub connects to the chassis, allowing you to run tighter toe and camber settings for crisper cornering and more stable mid-corner balance.

Is the S4-300RFA a direct swap for the resin bush S4-300BS?

Yes, it is designed to replace the S4-300BS without modifying the chassis, so installation is straightforward for anyone comfortable with basic teardown and reassembly.

Any tips for installation and setup after fitting the mount?

Check rear toe and camber after fitting, start with conservative alignment and increase aggressiveness as you test; also inspect mounting hardware torque regularly to prevent loosening.

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