48 Pitch 81 Tooth Spur Gear for Re-gear and Replacement - Yokomo YOKSG4881  [YOKSG4881]

Compatibility and re-gear notes

This Yokomo YOKSG4881 spur gear is supplied as a 48 pitch, 81 tooth replacement for RC models that use 48 pitch gearing. It is intended for gear systems where changing the spur tooth count is the standard way to adjust the overall drive ratio and vehicle behaviour. The guidance below emphasises compatibility checks and practical re-gear considerations.

Compatibility: the part is for 48 pitch drivetrains and gearboxes accepting 48 pitch spur gears; verify your chassis pitch before purchase. An 81-tooth spur creates a higher reduction compared with smaller spurs, typically increasing wheel torque and reducing theoretical top speed for a given motor and pinion combination.

Installation notes: clear any slipper or motor mount interference for correct mesh, ensure pinion and spur backlash is set to prevent undue tooth stress, and align the motor pinion with the spur centreline to avoid binding. After fitting, perform a gentle run-in at low throttle while checking for noise and uneven rotation, then re-check mesh and fasteners.

Tuning role: swapping to an 81-tooth spur is a direct method to modify acceleration and throttle footprint without changing motor or ESC settings. Match spur and pinion choices to achieve the target overall ratio, and always confirm clearance with the chassis, transmission housings, and any optional differential parts.