About how may hours can you expect to get on a set of spark plugs? As
you start to get erosion on the electrodes, how do you decide it is
time for a new set?

I'm running Slick Mags on my IO360. How many hours can I expect to
run these before I should have them rebuilt?

Mike,

 

General information (I have no idea where it came from) would have us believe that Slicks should be seriously looked at every 500 hours.

 

Plugs?  Hmmmmmm....  I have "fine wire" plugs - made with an exotic metal that does not participate in the fire.  Thus, they do not erode and, some say, more easily allow the spark to bridge the gap resulting is less misfires.  Champion probably has a web site with examples of plugs that have reached the end of adjustment - the center electrode is a pronounced oval rather than round.

 

Replace those plugs if you have been winning races and just lost one!