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Spark plug by Autolite; fits Shovelhead 1975→, Evo Big Twin 1984→; also for: S&S engines and cylinder heads; thread: M14 x 1.25; thread length: 3/4 ”; wrench size: 13/16 ”; manuf. labelling: 4265, corresp. to OEM: 5R6A; replaces OEM 32312-77, 32311-83, and 32342-04; gross weight: 6 g

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Autolite Spark Plugs

Autolite is one of the classic American spark plug brands, made by the oldest American manufacturer. Recommended for magnetos.

Spark Plug Heat Ranges

Harley spark plug heat ranges are marked by numbers, from 2 to 12. No. 2 is the hottest plug, no. 6 would then be a relatively cool plug. The coolest plug used by Harley-Davidson is marked 10R12A. Double numbers characterize multi-range plugs.

With older motors, it was not uncommon, that you achieved an optimum with plugs of two different heat ranges. Unlike the well known prejudice implied, you had to choose cooler plugs for the front and hotter plugs for the rear cylinder. On later Harley engine designs, heat distribution is balanced to such an extent that you should not have to rely on those tricks anymore.

Stroker owners should refer to OEM instructions for their specific type of motor, unless the manufacturer recommends entirely different plugs.
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    Spark Plug Wrench For all spark plugs with 16 mm and 21 mm hex. 180° swivel. Not suitable for Twin Cam models.

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