Yamaha EF4500iSE Theory & Diagnostics Manual page 21

TCI Ignition System
TCI ignition system is equipped with a speed limiter
function.
Speed limiter: 4500 rpm
The ignition coil and TCI unit is a single built-in unit,
while the speed limiter unit is a separate component
installed in the control box.
Generator Information and Theory
Oil Warning System
The oil-warning unit is built in the speed limiter unit.
The oil-warning switch is installed in the crankcase.
When the engine oil level drops below the specified
level, the ignition system is grounded and the engine
will be automatically stopped. This function prevents
the engine from serious damage.
The oil-warning lamp turns on by attempting to start
the engine so as to warn the operator that the
engine oil should be replaced or refilled.
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