Yokomo S4-300RRA Aluminium Rear Mount for YZ-4S - Precision Alloy  [S4-300RRA]

Yokomo S4-300RRA Aluminum Rear Suspension Mount (Rear) for YZ-4S
Price:
NZD$34.96
Brand:
Yokomo
Model:
S4-300RRA
GTIN:
0639342210091
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Spares / Hop-ups - Yokomo - YZ-4 category
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Fine Tune Your YZ-4S With the Yokomo S4-300RRA

The Yokomo S4-300RRA Aluminium Rear Suspension Mount is crafted as a durable replacement for the stock resin bush on the YZ-4S. Its alloy construction opens up more precise rear axle and suspension adjustments, helping drivers balance grip and stability across different surfaces.

Why Aluminium Improves Handling

Alloy components deliver improved rigidity without a heavy penalty, allowing more exact tuning of suspension geometry. The S4-300RRA is built to stay true under load so you can rely on consistent response when pushing for lap time improvements.

Chassis Compatibility and Fitment

This rear mount is compatible with chassis types such as B-YZ4SF, B-YZ4SF2-1, MOR-010, and MOR-020. Fitting is straightforward using standard tools and the existing mounting points, so hobbyists can upgrade quickly and revert to the original part if needed.
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.

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

Yes, it installs in place of the resin component using the factory fixing points and standard screws.

Will I notice a weight change after fitting this mount?

The aluminium part may add a small amount of mass, but the increase is minimal and is usually offset by the gains in rigidity and tuning precision.

Any tips for setup after installing the alloy mount?

Recheck rear geometry settings such as toe and camber and perform a few short test runs to confirm handling changes before a full race program.

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