Engine control circuit for a lawn tractor

An engine control circuit for a lawn tractor comprising:

• a magneto-operated engine;
• a key-actuated multi-position switch having first, second, third and fourth positions;
• a first circuit for connecting said magneto to ground when said switch is in the first position thereby preventing said engine from operating;
• a second circuit for connecting said engine to a battery when said switch is in the fourth position thereby causing said engine to operate;
• a third circuit for connecting said magneto to ground when said switch is in the third position to stop said engine from operating, said third circuit including a reverse sensing switch and a power take-off switch, the connection to ground being completed when said power take-off switch is closed and said reverse sensing switch detects that said tractor is intended to move in a reverse direction;
• a fourth circuit for isolating said magneto from ground when said switch is in the second position to permit said engine to continue to operate when said power take-off switch is closed and said reverse sensing switch detects that said tractor is intended to move in a reverse direction;
• and operator presence detector switch for connecting said magneto to ground when said detector switch is not activated by the operator's presence so as to prevent said engine from operating;
• and
• an additional switch connected within said control circuit between said operator presence detector switch and said reverse sensing switch and power takeoff switches.