Agreed, I check mine every 5-7K and if needed replace them. Otherwise I clean them off and put them back in.

 

I cleaned mine at 10k and replaced them at 20k. I didn't need to replace them but I was going on a long trip so I did it anyway. Replacing at 5k......no way.

 

Is the extra cost worth spending on a high performance plugs and wires? Does it make a noticeable difference?
'98 FLHTCUI Which ones?
Thanks!

 

A Buddy just out of MMI told me to be sure to use the gold (copper) colored & NOT the silver (aluminum) colored anti-sieze on them.

 

Why?
I have been using Permatex(silver) for a long time,have not seen any problems.

 

I use iridium plugs in all my bikes and never replace them. 2010 EGC with 21,000mi.

 

Dunno, just what he said. If you're changing at regular intervals it's probably not an issue. If they stay in for years though it might be a problem...

He graduated from MMI, but he's just now enrolled in the school of hard knocks... Helped me with my cam install & didn't get the pipes tight enough in the head and had exhaust leaks front & back. They covered that kind of stuff in class, but the bikes that were worked on stayed in the class & didn't get ridden.

I still have the silver anti-sieze on my garage shelf FWIW.

 

I guess I go the other way. It's such an inexpensive part, why not change them out? I do that with my smaller engines as well. I would just rather change them out and know that it's going to carry me through the season. Personal preference is all.

 

I replace them every spring when servicing the bike. For a few bucks, I'm not worried about life span. Plus, they look purdy when new.

 

I think it has something to do with the aluminum based anti-sieze getting in the piston chamber. I know when I worked in the power plant...copper was not to be used on steam valve bolts because of potential reaction with steam and superheated steam.

I don't use any.....just don't cross thread, never had a problem. I don't want any metal getting in my piston chambers.