You can use a gear puller similar to this:
http://www.readyheli.com/Universal_P...r_p/acc650.htm
Or
Use and arbor press, support the bottom of the pinion and the rest of the motor unsupported. Press the gear and shaft flush. Use a pin to push the shaft the rest of the way out.
The white paper says the following:
3. Press the modified pinion gear (.125 inch +0.0000" -0.0005 " hole) on the shaft. The distance from the
top of the pinion gear to the front of the motor case is .072 inches, measured with the motor shaft biased
towards the motor. Be careful not to bend this motor shaft. Make sure the shaft is square as you press on
the gear.
The are saying to bore the hole out to .125" no bigger and up to .0005" smaller. Good luck.
