Rinse the chicken inside and out well under cold water, then pat dry using a paper towel.
In a small bowl mix the lemon juice with oil and melted butter until blended, then rub all over the chicken.
Using clean hands rub the inside and outside of the chicken with seasoned salt, garlic powder, black pepper and cayenne (you can season the chicken under the skin also if desired).
Place the lemon/s inside the cavity.
Place the chicken into a baking dish (you can place the chicken onto a small roasting rack if desired and you may want to add in a little water to the pan to prevent smoking).
Using cotton string tie the legs together tightly.
At this point you may cover and refrigerate for up to 6 hours (not more than that or the acid in the lemon juice will start to "cook" the chicken).
Set oven to 450 degrees F.
Roast the chicken at 450 degrees for 20 minutes, then reduce the heat to 400 degrees and continue roasting for about 40 minutes (or until the internal temperature reaches about 175 to 180 degrees F. about 1 hour or a little less)
Cover with foil and let sit for 15 minutes before slicing (do not slice before that time or the juices will flow out!).