Question about 2003 Harley Davidson FXSTD Softail Deuce

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Spark Plugs What spark plugs are most people using? I replaced my Harley Brand plugs-6R12? with NGK standard plugs. The reason I replaced them is because the guy I bought the bike from said he had not replaced them for a while. My bike now sounds different and doesn't seem to run as good. Platinum or performance plugs the way to go I guess?

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Stick with the stock HD plugs because of the ion sensing.

Posted on Nov 20, 2008

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What spark plug is used in a 2003 harley davidson flhrci road king


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Im new in the harley world what spark plugs should i run in my 2002 roadking it is efi


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1 Answer

What size spark plugs do I need for my 2001 Harley Softail Standard


H-D 6R12 or equilivent.
http://www.customchrome.net/icatalog/full.aspx?Page=599

Personally, I prefer NGK spark plugs. I've had the best luck and longest life out of them in my Evo.

Good Luck
Steve

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What are the correct spark plugs for a 1991 fxsts harley?


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What type and number is the best Spark plug to run in this engine 2002 twin cam


Your bike comes from the factory with the HD Standard 6R12 spark plug. I would recommend running with this plug.
Here are some other options:

Plug Manufacturer TC88/95 Engine Plug Gap .040" H-D Standard 6R12 H-D Gold 6R12G H-D Platinum 6R12PP Champion RA8HC Autolite 4164 Autolite Platinum AP4164DP2 ACCEL 2418
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EX12P ACDelco NGK DCPR7E Bosch Denso Iridium IXU22

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