After adding slipons ,de catting , Stage 1 download ,S.E. air filter and Power Commander V. Should Spark plugs be changed to a hotter or colder heat range or just run the original ?

 

Stick with the original.

 

I've pretty much done a stage one on my bike. Tuesday, I changed my sparkplugs after 15,000 miles. They had a light brown to tan color to them and on the whole looked good. I wouldn't change to a different heat range.

 

I like the double platinum screaming eagle not really fir performance but durability.... They were in the bike for 60k mike saved still looked good...,replaced them because I had a gift card and didn't know what to buy...

 

So what gap should the spark plugs be at from MOCO?

 

I once tried the SE plugs but it seemed to do nothing for me. Have had no problems using the originals. I gap them at .040

 

They didn't add performance but they lasted forever.

 

Here ya go boys...what ur diagnostics tell ya...just as it sits front plug left rear plug right

 

Wow, we can really see by your pics that the rear cylinder is running much hotter than the right. In the past I've had a problem with the rear plug loosening up. Just wondering if that is a result of the higher heat and expansion and contraction of the cylinder head. Both plugs were tortured the same.

 

I can tell ya those plugs were tight as a 40yo virgin. Made sure when I gapped and reinstalled them to put on some anti-seize.