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The three most common reasons why you might get "engine knock" could be: 1) You need a higher octane gasoline for your older engine. 2) Your carburetor might be running a little too lean. 3) You might be experiencing pre-ignition in your cylinders (which can be caused by a variety of reasons).

Any one of these existing conditions could possibly not show up the symptoms until the engine gets up to operating temperature.

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15y ago

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