E-flite Yak 54F 3D ARF - Manual (Page 22)

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 4. Attach the propeller as shown.
Note : If you are using either the E-flite™ Park
370 Outrunner or Park 400 Outrunner, follow
the next steps for changing the shaft and
installation of this motor.
 5. To use the E-flite Outrunners, the shaft of the
motor must exit the fixed part of the motor
instead of through the rotating portion. You will
have to change this. Loosen the setscrew in the
rotating part of the motor. Slide the shaft though
the motor and tighten the setscrew.