This gear set supplies aftermarket replacement gears intended for JR Propo servos listed as 4000, 4135 and 4735. Installing the kit restores correct gear engagement and smooths response without modifying the servo electronics or shell.
Fitment is limited to the model codes shown, so verify your servo before ordering. During installation, keep track of the gear order and orientation and inspect bearings and shafts for signs of wear to promote reliable operation after reassembly.
When tuning servo behaviour, this set helps preserve correct mesh and reduce binding, supporting consistent rotation and longer service life when installed correctly.
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