Yokomo S4-300RFA Aluminium Rear Mount Upgrade for YZ-4S  [S4-300RFA]

Yokomo S4-300RFA Aluminum Rear Suspension Mount (Front) for YZ-4S
Price:
AUD$26.47
Brand:
Yokomo
Model:
S4-300RFA
GTIN:
0639342188185
Condition:
Brand New
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Reinforce Your YZ-4S Rear with Aluminium Mount

The Yokomo S4-300RFA aluminium rear suspension mount is intended to strengthen the rear assembly on YZ-4S cars. As a direct replacement for the resin bush (S4-300BS), the aluminium part provides greater durability and more predictable alignment adjustment, helping drivers manage corner entry and exit behaviour.

Who It Fits and Why It Helps

Compatible with Yokomo B-YZ4SF, B-YZ4SF2-1, MOR-010, and MOR-020 models, this upgrade suits hobbyists who want repeatable geometry and tougher parts. Aluminium's lower wear characteristics help keep setup settings stable over more running sessions.
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.

Does this mount affect tyre wear or drivetrain stress?

The stiffer mounting point can change load distribution slightly, so monitor tyre wear and drivetrain bearings after installation and adjust setup if needed.

Is there any special hardware required to fit the S4-300RFA?

No special hardware is normally required; it uses the stock mounting points and fasteners, though you should check torques and consider thread locker for competition use.

Will the aluminium mount change suspension geometry?

Geometry remains the same in terms of mounting locations, but reduced component flex can make alignment changes feel more pronounced when tuning.

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