In addition, this switch has a second sensing circuit
which prevents the starter pinion from remaining
engaged in the flywheel at excessive RPM.
After the starting motor has cranked the engine, the
pinion gear can remain engaged with the fly wheel as
engine speed increases. At 600 RPM, the magnetic
pickup opens the circuit to the
starter motor which allows the pinion to disengage. The
circuit remains open until the flywheel stops. This
prevents energizing the starter motor again while the
flywheel is turning.
Overspeed Shutoff Switch (Electro-Mechanical)
This switch is mounted either on the tachometer drive or
on the governor. Excessive engine speed closes the
switch by centrifugal force.
To reset the switch, push the button marked RE SET.
The knob will remain down until the engine overspeeds.