Scorpion SPHK-2216MSK Outrunner Motor Shaft Kit, 4mm Shaft with 3.17mm Output End  [SPHK-2216MSK]

Motor shaft replacement for HK-2216

This shaft kit is a direct replacement part intended for HK-2216 series outrunner motors used in electric RC models. The component replaces the central shaft that transmits rotation from the motor rotor to the pinion or output coupling, restoring alignment where the original shaft is worn or damaged.

Design emphasis is on fit and function rather than performance gains. The kit's 4mm main shaft and 3.17mm output end match the HK-2216 series interface dimensions to ensure proper seating in the rotor and pinion side. When installing, inspect the rotor and stator faces and the motor bearings for wear, as a new shaft will not correct existing bearing play.

For maintenance and tuning, this part is useful when rebuilding motors after heavy use or when correcting shaft runout that affects throttle smoothness. Use standard motor disassembly and reassembly procedures, verify axial and radial clearance after install, and perform a bench spin to confirm smooth rotation before reinstallation in the model.