Cut potatoes in half lengthwise. Cook potato halves in boiling water 5 minutes or until crisp-tender; drain. Rinse with cold water; drain well. While potatoes are cooking, remove 3 tablespoons adobo sauce from canned chiles. Place remaining sauce and chiles in a zip-top plastic bag; freeze for another use. Combine 3 tablespoons adobo sauce, butter, cilantro, salt, and juice in a small bowl. Place potatoes on grill rack coated with cooking spray; grill 4 minutes on each side or until potatoes are done, basting frequently with orange juice mixture.