Prepare chicken for grilling, test chicken for  doneness, spit roast a whole chicken, make your own barbecue sauce, and  brush on a finishing touch before serving. 
Chicken Prep
Remove the chicken from the refrigerator just  before cooking. Pull off any fat and clean the cavity. Don't remove the  skin; it keeps the meat moist as it cooks. If you wish, remove the skin  after cooking to lower the fat content.
Rub the chicken with a lemon and brush it with a  thin film of olive oil. Or try some sesame or walnut oil, both of which  impart special flavor. Season with salt and pepper and with parsley,  rosemary, sage, or tarragon.
Is It Done Yet?
Outside temperature affects the interior heat of a  grill. Chicken parts, quarters, and halves require 45 to 60 minutes on  the grill on a balmy day and as much as 1 hour 15 minutes on a cold or  windy day.
Cook's Secrets
"Too much charcoal ruins a barbecue, causing  flames and burned food. Small chicken legs need a minimum of 30 minutes  to cook, large legs 45. 
So, for a relatively slow fire, put two loose  layers of charcoal pieces or briquettes on a tiny fire. If more charcoal  is needed later, push it in at the edges, otherwise it will shoot soot  onto the food." Test halves and quarters with an instant-read  thermometer for doneness -- 180°F for breast meat; 185°F for dark meat.  Or slit a joint or meaty spot with a thin knife. If the juices run clear  and the flesh shows no signs of pink, the bird is done. If still  pinkish, cook a few minutes longer.
Whole Chickens
Spit roasting over a fire gives chicken crisp  skin and great flavor. To prep the chicken, season it inside and out  with salt, pepper, and sauce, if desired. Tie the legs to the tail and  wrap cooking twine around the breast to hold the wings in place. Push  the spit from the neck through the body and out the tail. Fasten spit  forks at the front and back. Engage the spit and turn once to balance.
Push the coals to the back of the grill and set a  drip pan below the cooking spot. Lock the spit in place, start the  motor, and cook the chicken until the skin blisters and browns lightly.  (Raise the spit for a roaster weighing more than six pounds so the drip  pan is seven inches from the bird.)
Cook, basting with sauce or equal parts of olive oil and lemon juice every 15 minutes, until a meat thermometer reaches 185°F.
Saucy Strategy
If you like to slather sauce onto chicken while  it cooks, the following is a good sauce to choose. It adds punchy flavor  but will not cause flare-ups.
In a small saucepan, stir together 1/2 cup  chicken stock, 1/4 cup lemon juice, 1 tablespoon each olive oil, minced  parsley, tarragon, or rosemary, and 1 minced garlic clove. Add 1/2  teaspoon salt, 1/4 teaspoon freshly ground black pepper, and, if  desired, 1/2 teaspoon hot red pepper sauce. Place the pan of sauce at  the edge of the grill so it stays warm and is handy for basting the  chicken.
A Finishing Touch
For traditional barbecue flavor, brush this sauce  on chicken when it is done. In a small saucepan over moderate heat,  saute 1/4 cup finely chopped yellow onion in 1 tablespoon oil 2 to 3  minutes, add 1/2 cup bottled barbecue sauce, and 1/4 cup each of lemon  juice and chicken stock. Keep hot at the edge of the grill. This is  enough for 4 chicken quarters.
