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

Front one-way pulley for BD7/BD5

The Yokomo BD-643F is a 40T front one-way pulley intended for use on BD5 and BD7 front one-way assemblies at RC scale. It serves as a direct-replacement pulley to restore or adjust front drivetrain engagement characteristics, and is supplied with basic fastening hardware for installation.

This part is supplied as a single 40T pulley intended for the front one-way unit. The role of the pulley is limited to the front differential/one-way assembly in the scale model drivetrain, it does not apply to real vehicle systems.

Installation notes: remove the front one-way hub following your chassis service procedure, fit the BD-643F pulley onto the hub, secure using the supplied fasteners, and confirm free rotation and proper engagement before running. Do not overtighten fasteners and verify orientation matches the one-way unit design.