Yokomo S4-302RA YZ-4S Rear Gearbox Upgrade Unit  [S4-302RA]

Yokomo S4-302RA Rear Gear box for YZ-4S
Price:
CAD$16.22
Brand:
Yokomo
Model:
S4-302RA
GTIN:
0639342210138
Condition:
Brand New
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Yokomo YZ-4S Rear Gearbox Overview

The Yokomo S4-302RA rear gearbox is a key upgrade for YZ-4S owners, built to increase longevity and refine drivetrain feel. It is made to fit B-YZ4SF, B-YZ4SF2-1, MOR-010, and MOR-020 chassis and helps keep power delivery smooth during hard laps.

Durable Design for Track Use

Manufactured with precision, the Yokomo S4-302RA rear gearbox stands up to frequent racing and practice sessions. Its solid construction reduces wear on mating parts and aids predictable handling for drivers pushing their YZ-4S machines.

Fitment and Fast Installation

The S4-302RA mates directly with several Yokomo frames including B-YZ4SF, B-YZ4SF2-1, MOR-010, and MOR-020, allowing quick swapouts with minimal setup time. The accurate fit simplifies installation and helps retain factory geometry and drivetrain alignment.
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.

Will the Yokomo S4-302RA improve drivetrain reliability?

Yes. The S4-302RA is designed to be more robust than some stock units, helping reduce failures under track conditions when installed and maintained correctly.

Are any modifications needed for fitment?

No major modifications are required for the listed chassis. Check mating hardware and bearings during installation and replace any worn items for best results.

How should I maintain the gearbox between events?

Regularly inspect gears and bearings for play or wear, clean out debris, and refresh lubrication when needed to preserve performance and extend service life.

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