HI again everyone...Can someone tell me the size of the thread on the plugs on my 2004 Heritage Softail are they 14mm? I know, I know I am getting the manual honest...hope it's for exmas. Also how important is it to torque the plugs in? I read a thread here somewhere on the subject but can't find it now.


Campdreamer

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They should be 12 MM and do torque them for better heat transfer with a dab od neversieze on them.

 

Thanks for the info TCSTD.

 

And just food for thought...you might consider using Permatex Anti-seize lubricant on the threads. I only ride the old stuff, stock 49 and a 65, but my pop intoruduced me to the stuff and he rode a 46. I will say that it keeps the plugs from being a bitch to take out when you do your tune up.

 

Keep anti-seize away from electrode end.Its got carbon in it and spark can sense it and misfire can occur[rare]...12mm,seat plug and another 1/8 turn will get you close to torq spec,11-18FT lb,Bob

 

Actually they are 14mm X 1.25 pitch.Standard spark plug thread.

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