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Spark (Cont.)
The spark can be checked using a spark tester.
Simply connect the spark plug lead to the tester and
ground the clamp to the engine.
Pull the rewind starter or engage the starter and check for
spark output in the window.
Ignition System
The ignition system provides a high voltage spark in
the combustion chamber at the proper time.
Two types of ignition systems
Battery
Magneto
Battery
Battery systems transforms the battery voltage and
fires the spark plug at the correct time.
Magneto
Magneto systems must produce the current,
transform the voltage and time the spark plug.
Most small engines use the magneto system
Two types of magneto systems:
Breaker point ignition
Solid state (electronic) ignition
Breaker point ignition
Older system. Most manufacturers have replaced
them with solid state.
Uses a set of points to break the primary circuit.
Solid state ignition
Uses a transistor to break the primary circuit.
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