The Kyosho LA375-76 spur gear is supplied as a 48P pitch, 76-tooth replacement intended for gearboxes identified with ZX6.6. It is described as a component that influences gear mesh and final drive ratio rather than a packaged performance enhancement.
Verify compatibility using the part designation and your model documentation; ensure ZX6.6 references match your gearbox before ordering. Prior to fitting, inspect the gear for concentricity and tooth condition and pair it with the correct 48P pinion to avoid premature wear.
Fitting notes: remove the transmission cover, confirm spur and pinion are both 48P, set mesh by adjusting motor mount or pinion spacing, and refit the original retaining hardware securely. Perform a low-speed run-in to confirm smooth engagement and detect any abnormal noises or binding.
Tuning notes: the 76T spur changes the driven ratio to trade top speed for increased wheel torque; use it when seeking a specific ratio for handling or track demands. After swapping spur sizes, review slipper clutch and differential settings to preserve handling predictability and drivetrain longevity.
Keep replacement spur gears available and swap out any gear with chipped or inconsistent teeth to keep gear mesh consistent and to prevent secondary damage to pinions and bearings.
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