Yokomo S4-503R16A 40T Ring Gear for YZ-4S - Track Ready Part  [S4-503R16A]

Yokomo S4-503R16A 40T Ring Gear[Use w/16T D Gear]for YZ-4S Gear diff
Price:
AUD$41.71
Brand:
Yokomo
Model:
S4-503R16A
GTIN:
0639342210381
Condition:
Brand New
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Get Consistent Diff Response on Your YZ-4S

The Yokomo S4-503R16A 40T ring gear fits the YZ-4S gear differential and is cut for precise engagement with a 16T drive gear. It is compatible with multiple YZ-4S chassis and helps keep differential behaviour predictable under racing conditions.

Specifications

  • Tooth Count: 40T
  • Compatibility: Pair with 16T drive gear
  • Supported Chassis: B-YZ4SF, B-YZ4SF2-1, MOR-010, MOR-020
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 the S4-503R16A work with different gear ratios?

The S4-503R16A is designed around a 16T drive gear; fitting other drive gear sizes changes overall ratio and may require checking pinion fit and mesh for noise or binding.

Will this gear affect drivetrain noise?

Correct mesh and a light break-in should produce quiet operation. Worn or poorly meshed gears will increase noise regardless of tooth count.

What are recommended checks after fitting?

After installation check mesh, rotate the diff by hand to confirm smoothness, and recheck after a short run to ensure nothing has shifted.

Can this ring gear be used for upgrades?

Yes, swapping to the S4-503R16A is a common chassis refresh or rebuild step to restore gear integrity and consistent diff performance.

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