LAZER ZX7.5 Centre Shaft Upgrade - Kyosho LAW79B  [KY-LAW79B]

Supplied as Kyosho part LAW79B, this aluminium centre shaft is specified for the LAZER ZX7.5 family and associated ZX-series arrangements. The part reference 88/7075 denotes the aluminium alloy used in machining, indicating a shaft made for direct replacement within the ZX7.5 centre driveline.

A centre shaft in the driveline transmits torque from gearbox outputs to differentials or intermediate gears while preserving alignment via bearings and housings. When installing LAW79B inspect bearing clearances and retention hardware for signs of wear, run the shaft to check for smooth rotation before finishing assembly, and confirm that gears or couplers engage cleanly. Careful adjustment of bearing preload and shaft seating can have a marked effect on vibration and efficiency.

Alloys in the 7075 family balance stiffness and machinability for RC drivetrain components, yet service life is governed by operating loads and upkeep. Check the shaft surface, keyways and any set-screw interfaces at intervals and replace the shaft if scoring, burrs or ongoing vibration remain after bearing or gear servicing.