Re: tight armature plate, Evinrude 18102
Welcome aboard!
Pull the clip that connects the armature plate control 'arm' to the vertical throttle shaft, and try to turn armature plate by hand (to rule out a sticky tiller handle). If it's indeed a sticky armature plate, pull flywheel and armature plate and brass support ring. Clean off old grease, re-lube (sparingly) w/white lithium grease, reassemble, and you should be good to go. You may want to file-up your pointset 'faces' and reset to .020" while your in there.
Good luck!