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The reason to check the ignition timing, is to get the best efficiency out of the engine. Fuel economy and power.

The spark has to ignite the fuel/air at just the right time, to be efficient.

Most modern engines have this done automatically, by computer and sensors.

You may need to check it after a rebuild, or you suspect problems.

Older engines need to be checked more often, as things wear or bed in.

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13y ago

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