Scorpion SPHK-2216MSK 4mm Shaft with 3.17mm Output End - Outrunner Motor Replacement for HK-2216  [SPHK-2216MSK]

Service shaft for HK-2216 outrunners

This shaft kit serves as a direct swap for HK-2216 series outrunner motors in electric RC models. It replaces the rotor's central shaft that drives the pinion or output coupling, correcting misalignment caused by a worn or bent original shaft.

The focus of the design is reliable fit and correct dimensions rather than increasing power. The 4mm main shaft and 3.17mm output end conform to HK-2216 interface sizes to ensure correct seating with the rotor and pinion. Inspect rotor faces and bearings before assembly, since a new shaft will not remedy existing bearing wear.

Use this part when rebuilding motors after extended use or to fix shaft runout that affects throttle response. Follow standard disassembly and reassembly practice, check axial and radial clearances after fitting, and bench spin the motor to confirm smooth operation before refitting into the model.