BD7 BD5 Compatible 40T Diff Pulley BD-503D by Yokomo [BD-503D]

Yokomo BD-503D 40T diff pulley for BD7/BD5

Price:

AUD$3.29

Brand:

Yokomo

Model:

BD-503D

GTIN:

3888

Not Available

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Spares / Hop-ups - Yokomo - BD7 category

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Description
FAQ

Large Diameter Pulley — Summary

This single 40T pulley is a replacement part for 1/10 on-road RC differentials, aimed at BD7 and BD5 related drivetrains. By increasing pulley diameter it shifts ring geometry and alters differential wrap, which impacts how torque is delivered during cornering.

It is compatible with a broad set of Yokomo BD-series and DP/DP-DIB variants; always check belt mesh, bearing clearance, and spur/pinion alignment once fitted to keep the drivetrain operating smoothly. Sold as one piece for hobby differential tuning scenarios only.

Packing includes

Diff Pulley - 1 pcs

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.

How should I adjust diff oil after fitting this pulley?

Expect different engagement characteristics; try slightly lighter or heavier diff oil and vary preload in small steps to dial in mid-corner grip and throttle response. Test progressively on track.

Do I need any special tools to fit the BD-503D pulley?

Basic RC tools are sufficient: hex drivers, a pin to hold the diff while tightening, and feeler checks for mesh. No specialised machining is required for standard BD7/BD5 installations.