>
Shop
>
Ignition
>
Spark Plugs
>
Spark Plugs #5R6A: Shovelhead 1975→, Evolution Big Twin 1984→

Spark Plugs #5R6A: Shovelhead 1975→, Evolution Big Twin 1984→

Select variant:
12-027
by Champion; manufacturer-code: RN12YC
12-086
»OEM«; USA
Price and stock:
Item №
12-027
Price incl. VAT
6.31 €
Available
100+
Ready for immediate delivery from our Würzburg, Germany warehouse
The price includes 1.01 € German VAT.
piece
Save to wish list
  • Spark plug by Champion
  • 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 ”
  • manufacturer-code: RN12YC
  • replaces Harley-Davidson part number HD 32312-77, 32311-83, and 32342-04
  • gross weight: 70 g

Champion Spark Plugs

Stock replacements since decades with proven performance. Excellent value.

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.

Have any questions?

Our service team will be glad to help out: Mondays - Thursdays 08:00-17:00 CET, Fridays 08:00-16:00 CET, Phone: +49 / 931 250 61 16, eMail: service@wwag.com