Yokomo YOKSG4881 Spur Gear 48 Pitch 81 Teeth  [YOKSG4881]

Spur gear for 48 pitch systems

This Yokomo YOKSG4881 spur gear is an RC-scale replacement part specified as a 48 pitch, 81 tooth spur gear. It is intended for use in 48 pitch gear systems where tooth count changes are used to tune gear ratios and alter acceleration versus top speed characteristics. The description below focuses on real-world installation and tuning considerations rather than specifications not provided with the product name.

Compatibility: this part is for 48 pitch drivetrains and gearboxes that accept 48 pitch spur gears; confirm your chassis uses 48 pitch before installation. When changing to an 81-tooth spur, expect a lower effective gear ratio compared with smaller-tooth spurs, which typically increases torque at the wheels and reduces top speed for a given motor setup.

Installation notes: remove slipper and motor mount clearances as required by your chassis, ensure the pinion and spur mesh is set with correct backlash to avoid premature wear, and check that the motor pinion aligns with the centerline of the spur to prevent binding. After installation, run-in gently at low throttle while checking for noise or uneven rotation, then re-check gear mesh and hardware tightness.

Tuning role: swapping to an 81-tooth spur is a straightforward way to fine-tune acceleration and throttle response without changing motor or ESC settings. Use it in combination with appropriate motor pinion changes to achieve the desired overall ratio, and always verify clearance with the chassis, transmission housings, and any optional diff components.