ZX6.6 Spur Gear 48P-76T Replacement - Kyosho LA375-76  [KY-LA375-76]

Spur gear briefing

The Kyosho LA375-76 is a spur gear replacement described with a 48P pitch and 76T tooth count, intended for applications that reference ZX6.6. It is supplied as a drivetrain component to influence gear mesh, torque transfer, and final ratio rather than as a full-system performance package.

Compatibility depends on the part designation, so confirm ZX6.6 on your gearbox or parts list before installation. Inspect the gear for concentricity and tooth condition before fitting, and pair it with a matching 48P pinion to prevent accelerated wear.

Installation notes: remove the transmission cover, confirm pinion and spur pitch match (48P), set correct mesh by adjusting the motor mount or pinion spacing, and fasten with the original retaining hardware. Perform a controlled run-in at low throttle to validate smooth engagement and to detect any binding or unusual noise.

Tuning role: fitting the 76T spur changes the effective gear ratio to increase wheel torque while reducing top speed; use it to reach a target ratio for specific track conditions. After altering spur size, check slipper clutch and differential settings to preserve predictable handling and drivetrain reliability.

Keep spare spur gears available and replace any gear that shows chipped teeth or uneven wear to maintain consistent mesh and avoid secondary damage to pinion gears or bearings.