Remove your rear quick release axle and take wheel.
On the motor side of the spindle, there is a gap between the motor and spindle.
Remove the gas tank
Pull the 10mm bolt from the inside of the spindle.
Take your spindle remover or pry bar, slide between the motor side and edge of spindle. Hit ONCE from the bottom real light, and once horizontally. If the spindle does not pop off the first time. Try tapping it horizontally again. Some spindles maybe stubborn to get of. Don't get discouraged.
When the spindle comes off it will look like this. If it looks any different, you have done something really wrong !!
ADDITIONAL: To install a new spindle, just slide the tapered side of the spindle back onto the crank.
Replace the bolt back into it. Put tank on. Then wheel. After is installed, make the proper adjustments for tensioning the quick release, and your ready to roll.