YZ-4 Replacement Main Shaft Z4-644 by Yokomo  [Z4-644]

Replacement shaft for YZ-4 buggies

This is a steel main shaft tailored for the YZ-4 4WD off-road buggy platform. It acts as the drivetrain spine, where alignment and rigidity affect how power is delivered to the wheels.

Made from steel, the component is supplied to replace the original shaft directly. It helps maintain gearbox-to-hub alignment, resists deformation under load, and secures couplings and bearings for consistent operation.

Before fitting: inspect bearings and hub bores for wear, ensure the shaft seats correctly without binding, and replace any worn circlips or bearings. With the chassis supported, spin the drivetrain to confirm there is no runout before use.