Step 1In a spice grinder or small food processor, pound or process the chile powder, salt, garlic powder, thyme leaves, cumin seeds and oregano to a fine powder.
Step 2Start a fire with 10 pounds of charcoal. Skewer the chicken on the spit. Truss moderately tightly with cotton twine. Dust it liberally with the spicing mixture.
Step 3When the coals are covered in gray ash and the fire has settled to the point that you can hold your hand at skewer level for 3 to 4 seconds, begin roasting the chicken over indirect heat. It will take about 1 hour for the chicken to reach 160 degrees.
Step 4Remove the chicken to a platter and set aside for 10 minutes to finish cooking and to allow the juices to redistribute. Remove the chicken from the spit and cut into serving pieces. Serve immediately.