Here is a better link for the flashing issue:
http://answers.yahoo.com/question/index?qid=20080210111402AAaNJIu
Partial quote:
Field Flashing of Portable Generators
This tip comes from the Briggs & Stratton Customer Education Department via Precise Engine Repair web site.
As an alternative to flashing a rotor winding with a battery applied to the brushes, an electric drill may be used. Follow these steps to flash the generator:
Plug the electric drill into the generator receptacle. (Cordless drills do not work)
If the drill is reversible, move the direction switch to the forward position.
Start the generator
While depressing the trigger on the drill, spin the drill chuck in reverse direction. This will excite the field and the generator will now produce electricity. If spinning the chuck one direction does not work, try spinning the chuck in the other direction as you may have the reverse switch positioned backwards.
Use caution not to get your hand or other materials caught in the chuck. As soon as the field is excited, the generator will produce power and the drill will turn on.