Spur Gear for Lazer ZX7.5 - Kyosho LA427-78 (48P, 78T)  [KY-LA427-78]

Geartrain & Fit

The Kyosho LA427-78 is a 48 pitch, 78-tooth spur gear supplied as a spare for Lazer ZX7.5 vehicles. It functions as the large gear in the drivetrain and is intended as an aftermarket replacement for hobby on-road cars.

As a mechanical drivetrain part, the spur changes the final drive ratio and affects torque transfer depending on the pinion selected. It installs on the ZX7.5 spur shaft using the model’s existing mounting hardware, so double-check shaft dimensions and mounting alignment before fitment.

Fitment tips: measure backlash at the pinion interface to achieve correct tooth mesh, confirm the gear runs true with no axial wobble, and use a small amount of suitable grease on gear faces where needed. Hand-rotate the gearing after assembly to ensure smooth engagement prior to powering the model.

A practical spare for hobbyists and tuners looking to restore or modify gear ratios on Lazer ZX7.5 based cars, offering a direct swap to fine-tune on-road performance.