The timing Is for points to open relative to magnets spinning around the coils.-----Full throttle or idle makes no difference.-----This very same magneto is used on a single cylinder 1.5/ 2 HP and also 3 , 4 , 5.5 , 6 , 7.5 , 10 , 15 , 18 , 20 , 25 , 28 ,33 , 35 , 40 HP motors.---Used from...