Harley-Davidson Sportster Evolution Spark Plugs Replacement

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Installing the new Spark Plug

Using your fingers, install the new spark plug into the socket, and hand tighten until firm.
Using a torque wrench, tighten the spark plug to the proper specification.
When installing spark plugs, proper torque can be important. To loose and they could rattle out or leak; too tight and you can strip your cylinder head. The correct torque for this plug is between 90 and 120 inch lbs.

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