Z-Force Motor/Shaft

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Pre-2017
The motor shaft is keyed; the key has a square cross section.
Measurements
  • Dimensions seem to be ¼” square ⨉ 2.0” length (expressed in metric on drawings).
  • Ends 5mm from shaft end.
  • Shaft diameter is ⌀28.275mm+0-0.021
  • Shaft length extends 66.675mm beyond the motor face minus 4mm for raised parts of the face.
2013 models had a minor recall about the shaft key coming loose, but this was a design revision that has not recurred.
2017+
The motor shaft is splined to allow higher torque transmission.
Rumor has it (via Harlan at Hollywood Electrics) that the spline is supposed to match a Kawasaki KX250F as well as a Yamaha YZ450F.