That motor has been rewired? Are you sure the E-unit is getting power? Cycling full throttle should give you an indication that the solenoid is trying to move. If it is cycling correctly, perhaps the E-units connections to the motor were not properly rewired.
If it's stuck, sluggish, spray an electrical cleaner (CRC, Goo-gone, etc.) into the unit where ever you can fit the cans "straw-like" extensions. Then cycle power with the engine upright. It may several applications.
Panther recommends WD-40. But others council against any lubricants as they tend to pick-up and accumulate dust. Yet Panther has repaired some 100 Marx E-units.