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Spark plug by Autolite

Item №
  • fits Shovelhead 1975→, Evo Big Twin 1984→
  • also for: S&S engines and cylinder heads
  • porcelain / steel
  • thread: M14 x 1.25
  • thread length: 3/4 ”
  • wrench size: 13/16 ”
  • connection thread: M4
  • heat range: manufacturer-code 4265 corresponds to HD-code 5R6A
  • replaces Harley-Davidson part number 32312-77, 32311-83, and 32342-04
  • gross weight: 6 g

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.

net price*
* United States of America: Tax free shipping. Please check your local import fees.
In stock. Ready for immediate delivery from our Würzburg, Germany warehouse.
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