about 2 months ago i advanced the timing on my ga16 and i am just wondering if i did it correctly. i set it to 15 degrees, but my question is if i used the correct pulley mark. i set my timing using the left mark (looking at the pulley from the passenger side fender). did i use the correct mark?...or was i suppose to set it according to the middle pulley mark. the service manual said something about the left mark being -5, the middle being 0, and the right being +5. i didnt understand what that meant so i just set it to the left one. did i set it right or do i need to do it again?