Spark Plug help

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Mar 9, 2010 | 04:47 PM

#11

SC-Longhair

Club Member

Joined: Feb 2008

Posts: 11,483

Likes: 39

From: Passaic County, NJ

Jb...you can try emailing them.

Mar 9, 2010 | 06:23 PM

#12

wlbowers

Stellar HDF Member

Joined: Dec 2005

Posts: 3,229

Likes: 105

Quote:

Originally Posted by jb1023

So does anybody know if the NGK part # for a 2005 Dyna is the same as a 2007? I ask because their web site only goes up to 2005.

Starting in '06 the plugs are used by the ecm as a combustion sensor through ion levels. The wrong wires or plugs and you could throw a code.

I'd email them before I bought.

Mar 9, 2010 | 07:03 PM

#13

togfish

Tourer

Joined: Feb 2007

Posts: 304

Likes: 1

From: Virginia

The HD plugs for EFI engines are made by Champion but are proprietary to Harley. They have a specific resistance that works along with a tap on the coil primary winding to send a signal to the ECM in the case of detonation. They reccomend not even using SE plugs with this setup. The stock plugs are only about $5. How do I know? I stayed at a Holiday Inn Express last night.