Drill and tap 2 holes 180 degrees from each other into the pulley face. Then 2 bolts thru a spreader bar an threaded into the pulley. In the middle of the bar there is a hole for a bolt to be threaded into. Tighten the center bolt onto the motor shaft to remove the pulley. Like using a steering wheel puller. Some auto parts stores rent them.
Or like Bloy said, hit it with a propane torch. The aluminum will expand faster than the steel shaft when heated and fall off.
If it's not nailed down, it's mine.
If I can pry it loose, it's not nailed down.