Lazer ZX7.5 Compatible Spur Gear LA427-78 - Kyosho  [KY-LA427-78]

Kyosho LA427-78 - Spur Gear(48P-78T/ZX7.5)
Price:
£0.00
Brand:
Kyosho
Model:
KY-LA427-78
GTIN:
4548565524372
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Overview of the Spur

The Kyosho LA427-78 is a 48 pitch, 78-tooth spur gear supplied as an aftermarket replacement for Lazer ZX7.5 cars. It functions as the main large gear within the on-road drivetrain, intended for hobbyist and tuning use.

Being a mechanical drivetrain component, this spur affects final drive ratio and torque transfer when paired with a chosen pinion. It mounts to the ZX7.5 spur shaft using standard hardware, so confirm spur mount geometry and shaft size before fitting to avoid misalignment.

Recommended installation steps: set and measure a small backlash at the pinion interface, ensure concentric mounting with no axial movement, and use a light gear lubricant on tooth faces if part of your upkeep routine. Manually spin the drivetrain once installed to confirm smooth engagement prior to powered runs.

A practical spare for those restoring or adjusting gear ratios on Lazer ZX7.5 based RC cars, the LA427-78 allows straightforward adjustments to handling and speed characteristics.
Remark :
Due to limited stock availability, please notice that some Kyosho items may have to order from the factory and the ready time is around 4-6 weeks. Customer purchases the item is assumed to accept the waiting time which allows us to order directly from the manufacturer if the item is out of our warehouse.

How precise must the backlash be for race use?

For competitive on-road setups, aim for minimal but consistent backlash that avoids binding. Small adjustments and test runs will reveal the sweet spot for consistent tooth contact and reduced wear.

Will changing to this 78T spur affect motor load?

Yes, increasing or decreasing spur tooth count relative to your current pinion will change the effective gear ratio and therefore motor rpm and load. Select pinion/spur combinations to suit your motor and track conditions.

What inspection should be done during routine maintenance?

Regularly check the gear for tooth wear, scoring, or burrs, confirm secure mounting hardware, and refresh lubricant as needed. Replace the spur if teeth show deformation to prevent drivetrain damage.

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