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In a saucepan, combine the soy sauce, oil, garlic salt, pepper, brown sugar, mustard powder, ginger and pineapple juice.
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Bring to a boil, stirring to dissolve the sugar.
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Boil for about 5 minutes, then remove from the heat and allow to cool completely.
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When cooled, place the chicken into a large resealable bag and pour the marinade over it.
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Press out as much air as you can, seal and refrigerate for at least 2 hours to marinate.
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Preheat a grill for medium-low heat.
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When hot, lightly oil the grate. (I use Cooking Spray made for Grills.).
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Place the chicken on the grill and discard the marinade.
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Cook until chicken juices run clear, 20 to 25 minutes.
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Turn as needed to keep the chicken from burning.