BD-643F 40T Front One-way Pulley for BD7 BD5 - Yokomo  [BD-643F]

Yokomo BD-643F Front One-way Pulley 40T for BD7/BD5
Price:
AUD$5.87
Brand:
Yokomo
Model:
BD-643F
GTIN:
3888
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Or you may find similar product under the
Spares / Hop-ups - Yokomo - BD7 category
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Replacement 40T front pulley for BD5/BD7

The Yokomo BD-643F is a 40T front one-way pulley intended for BD5 and BD7 front one-way assemblies on RC cars. It is supplied as a single replacement pulley to help recover or fine-tune front drivetrain engagement and includes basic fastening hardware for fitting.

The component is provided as one 40T pulley and is intended solely for the front differential/one-way assembly of the scale model drivetrain. It is not applicable to full-size vehicle systems.

Fitment notes: remove the front one-way hub following your chassis procedure, install the BD-643F on the hub, fasten with the supplied screws, and check that rotation and engagement are correct before track use. Avoid excessive torque and confirm orientation matches the one-way design.

Packing includes

  • 40T One-way Pulley x 1 pcs
  • Nabe screw 2 x 5 mm RH Screw x 3

Compatibility

  • DP-DIB2
  • DP-DIB2R
  • DP-DIB2A
  • DP-DIB2RA
  • DP-DIB
  • DP-DIBR
  • DP-DIBG
  • DP-DIBRS
  • DP-DIBL
  • DP-DIBLR
  • DP-DIBLG
  • DP-DIBRSB
  • MRTC-BD7RS
  • MRTC-BD715B
  • MRTC-BD715O
  • MRTC-BD715S
  • MRTC-BD7RS2
  • MRTC-BD7RS3S
  • MRTC-BD8SV
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 does swapping to the BD-643F affect front handling?

Changing to a fresh BD-643F pulley can restore predictable one-way engagement, which may improve front traction feel. Match the pulley to your overall drivetrain condition for best results.

Can I reuse the original screws or should I use the supplied ones?

Use the supplied Nabe screws if they match your hub. If the original screws show wear or have different dimensions, prefer the included hardware to ensure correct fit and safety.

What final checks are recommended after fitting?

After installation, verify free rotation, confirm the one-way engages in the intended direction, and perform a short dynamic check to ensure reliable operation under load.

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