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Tool description: The Tecumseh 670366 spark tester (also referred to as an ignition tester) is used to check for the delivery of electric current from the ignition coil to the spark plug.
It is used by attaching one end to the spark plug terminal and the other end to the ignition wire. Then a visual observation is used to check for a spark between the terminals in the ignition tester.
Also identified as part number 730657