Replacement Steel Main Shaft for YZ-4 - Yokomo Z4-644  [Z4-644]

Precision main shaft for the YZ-4 drivetrain

This steel main shaft is a precision replacement part for the YZ-4 4WD off-road buggy. As the central rotating component, its straightness and fit determine how efficiently torque is transmitted to the wheels.

Crafted from steel, the shaft is intended to directly replace the original item without machining. It maintains alignment between gearbox output and wheel hubs, reduces the chance of deformation under load, and gives a stable surface for couplings and bearings.

Fitment advice: clean and inspect bearing seats and hub interfaces prior to fitting, make sure the shaft sits true and rotates freely, and swap any worn bearings or damaged circlips. Verify smooth spin with the chassis elevated and address any wobble before running at speed.