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Spark Plugs #2: IOE, 45”, V Models and Knuckleheads

Spark Plugs #2: IOE, 45”, V Models and Knuckleheads

  • fits IOE models 1927-1929, Singles 1926-1934, 45 cui/750 cc Flathead →1955 (exc. K-models), V models and Knucklehead
  • porcelain / steel
  • thread: M18 x 1.5
  • thread length: 1/2 ”
  • wrench size: 7/8 ”
  • connection thread: M4
  • heat range HD-code: 2
  • replaces OEM 32304-09, and 37-09B

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: IOE, 45”, V Models and Knuckleheads
12-028
by Champion; manufacturer-code: UD16
$6.58
each
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* United States of America: Tax free shipping. Please check your local import fees.

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