Spark Plug X Reference Chart

Here's a handy cross reference for Harley plugs.
Be advised that a change to a different plug or plug wire than stock could result in setting a code in the Delphi systems of later year Harley's from the ION sensing system that uses a set resistance to detect knock in the engine.

This is not usually true if just going to a colder heat range.

Usually a change between the HD plug and Champion plugs will set no codes.

Also here's a handy reference for all plugs in different bikes.
Spark Plug Interchange Guide

2003FLHPI · 10-23-2007, 10:55 AM

Is there one plug better than another?

glider · 10-23-2007, 02:09 PM

I would use the stock plug because of the ION sensing. If you change to a different type plug the ION sensing system will not work properly and pinging/detonation will not be detected and dealt with through the resistance in the plugs.

10-23-2007, 10:55 AM	#2 (permalink)
2003FLHPI New Family Join Date: 2007, Sep 10 Posts: 4	Re: Spark Plug X Reference Chart Is there one plug better than another?

10-23-2007, 02:09 PM	#3 (permalink)
glider Community Liaison Ride: 07 Road King Classic Join Date: 2007, Jun 21 Posts: 10,393 My Mood:	Re: Spark Plug X Reference Chart I would use the stock plug because of the ION sensing. If you change to a different type plug the ION sensing system will not work properly and pinging/detonation will not be detected and dealt with through the resistance in the plugs.

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Spark Plug X Reference Chart

Electrical and Lighting Systems