In small bowl, mix salt, cumin, pepper, and garlic powder. Rub mixture all over outside of chicken. Place chicken in 13x9-inch disposable foil pan, breast side up. Place pan of chicken on grill over medium-low heat. Cover grill; cook chicken 20 minutes. Turn chicken over; insert ovenproof meat thermometer so tip is in thickest part of inside thigh and does not touch bone. Cook 10 to 15 minutes longer, brushing with limeade last 5 minutes of cook time, until thermometer reads 180°F and legs move easily when lifted or twisted.