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Spark Plugs #2: 74”/80” U Model Flatheads

Spark Plugs #2: 74”/80” U Model Flatheads

  • fits 74”/80” U Model Flatheads 1937-1948
  • porcelain / steel, cone seat
  • thread: M18 x 1.5
  • thread length: 7/16 ”
  • wrench size: 13/16 ”
  • connection thread: M4
  • heat range HD-code: 2
  • replaces OEM 32302-09

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.
Item №
Version
net price*
unit
Availability in warehouse Germany
Spark Plugs #2: 74”/80” U Model Flatheads
12-029
by Champion; manufacturer-code: RF9YC
$6.83
each
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* United States of America: Tax free shipping. Please check your local import fees.

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