1. Doesn't matter. Any engine can be started with a box, as long as it has a proper flywheel that can be reached by the starter box.

2. Ofna's chrome top starter box is what i've seen recommended the most, especially for motors with a tight pinch.

3. Depends on the box. Some use a 12V Gel cell, some will use 6cell stick packs.

4. Depends on the battery type, and charger you have. A few peak chargers will do gel cells, but most won't.