Yokomo S4-503R17A 40T Ring Gear for YZ-4S Performance Replacement  [S4-503R17A]

Yokomo S4-503R17A 40T Ring Gear[Use w/17T D Gear] for YZ-4S Gear diff
Price:
AUD$41.71
Brand:
Yokomo
Model:
S4-503R17A
GTIN:
0639342210398
Condition:
Brand New
Write a review

Replace your YZ-4S ring gear with a Yokomo 40T unit

The Yokomo S4-503R17A 40T ring gear is intended as a reliable replacement for YZ-4S gear differentials. When used with a 17T drive gear, it helps maintain even tooth contact and consistent power transfer. The component is precision made to withstand routine track use.

Model fit and key attributes

This 40T ring gear is compatible with YZ-4S variants including B-YZ4SF, B-YZ4SF2-1, MOR-010, and MOR-020. Its tooth profile is optimised for clean engagement with the recommended 17T drive gear, helping to reduce slop and promote smoother acceleration.
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.

Do I need special tools to fit this ring gear?

Basic hobby tools are usually enough: hex drivers, bearing press or carefully used bearing tool, and gear mesh feeler or marking compound. Avoid forcing bearings to prevent damage.

What should I inspect after installation?

Check gear mesh for even contact, ensure bearings spin freely, and verify the differential runs quietly under light load before full-power testing.

Is this ring gear suitable for off-road tracks?

Yes, its construction is suited to typical off-road and mixed-surface club racing, but final durability depends on maintenance and driving conditions.

Copyright © 2008-2025 rcjaz.com.au All rights reserved