Combine the soy sauce, honey and garlic in a glass bowl, blending well. Add the pork roast, turning to coat on all sides. Cover and refrigerate for 3 days, turning occasionally.

To Grill:

Insert the spit through the center of the roast and secure tightly with the holding forks. Place on gas grill rotisserie, close the lid and grill over medium-low coals, basting often with the marinade. Cook for 2 hours or until no longer pink in the center or until the temperature on a meat thermometer reaches 170 Degrees F. Let the pork roast stand for 15 minutes before serving.