I have an 04 superglide with the 1450 motor. I am curious as to what people here recamend for plugs.

 

I use plain old copper core plugs, there is a lot of "snake oil" in the plug world...

 

stock

 

If you're running FI, A lot of people claim that running a plug other than stock, will cause your knock-retard system to turn off. I have not seen that in print anywhere, nor advertised by the MoCo either.....

Having said that, what is a spark plug? It is a measured distance in air for a spark gap. My recommendation would be a stock platinum plug. The platinum will provide longer surface life of the electrodes. Other than that, there is just not that many ways you can improve on a basic spark gap. You do want to maintain a proper "heat range", because you don't want your spark plug to ignite fuel when it's not suppose to. A colder plug loses more heat from the combustion cycle, than a hotter plug. You want you plug to be hot enough to burn away deposits, but not so hot that you get pre-ignition (knock). Too cold, and you'll be fouling plugs.

Need to think of your ignition system, the same way you think about fuel intake system. There are several components to it, and changing just one piece, is not going to get you much.

 

I don't have a owners or a service manual what do you guys gap them at? Ive been runing about .035", just a guess though

 

.04 if I remember correctly....... yup between .038 and .043

 

thank you sir

 

+1 $3.50 from my stealer.

 

Stock only on the 06 bikes because of the ION sensing feature.

 

stock...i change my plug this spring after storage..