Yokomo S4-302RA YZ-4S Heavy-Duty Rear Gearbox  [S4-302RA]

Yokomo S4-302RA Rear Gear box for YZ-4S
Price:
AUD$17.54
Brand:
Yokomo
Model:
S4-302RA
GTIN:
0639342210138
Condition:
Brand New
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Track-Focused Rear Gearbox for YZ-4S

The Yokomo S4-302RA rear gearbox delivers a more durable drivetrain option for YZ-4S racers who demand consistent performance. It is compatible with B-YZ4SF, B-YZ4SF2-1, MOR-010, and MOR-020 chassis and helps reduce drivetrain surprises on the track.

Engineered for Endurance

Precision machining and robust construction mean the Yokomo S4-302RA rear gearbox resists common failure points and provides longer service intervals. That makes it a solid choice when upgrading a YZ-4S for frequent use.

Straightforward Fitment and Service

Designed to match the factory mounting points, the S4-302RA installs cleanly into supported chassis. Regular inspection of gear faces and bearings will keep the unit running reliably between events.
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 gearbox a direct bolt-in for the YZ-4S range?

Yes, for the listed chassis models it is designed as a direct replacement, though you should verify hardware condition during installation.

Can the S4-302RA handle rough club tracks?

The reinforced design improves durability under rough conditions, but good maintenance and correct setup are still important for longevity.

Should I change gear oil after upgrading?

Top up or refresh lubricant as part of the installation checklist to ensure smooth gear engagement and reduce initial break-in wear.

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