Yokomo S4-503R16A 40T Ring Gear for YZ-4S Differential - Precision Fit  [S4-503R16A]

Yokomo S4-503R16A 40T Ring Gear[Use w/16T D Gear]for YZ-4S Gear diff
Price:
CAD$38.87
Brand:
Yokomo
Model:
S4-503R16A
GTIN:
0639342210381
Condition:
Brand New
Write a review

Tune Your YZ-4S Gear Differential

The Yokomo S4-503R16A 40T ring gear is made for the YZ-4S gear differential, delivering precise tooth engagement and stable power transfer when paired with a 16T drive gear. This well-crafted unit fits a range of YZ-4S layouts and helps keep your diff performing consistently during club runs and practice sessions.

Specifications

  • Tooth Count: 40T
  • Compatibility: For use 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.

Will the Yokomo S4-503R16A fit other differentials?

The S4-503R16A is designed for the YZ-4S differential geometry; it can fit other setups only if the housing and spline dimensions match the YZ-4S specification. Verify fit before installation.

What performance change does a 40T ring gear bring?

A 40-tooth ring balances torque and top speed, smoothing the diff action and helping traction on mixed surfaces when used with the recommended 16T drive gear.

Any tips for installing the ring gear?

Clean mating surfaces and lightly oil bearings. Check gear mesh and preload, then run a slow break-in to seat the teeth for quieter operation.

Copyright © 2008-2025 rcjaz.ca All rights reserved