Hi guys so I wanted to replace the spark plugs on my Apex, and 2 out of the 4 plugs this is what I found!! Sled has 4,300 miles on it runs great, just wanted to replace the spark plugs. These are the 4 spark plugs out of my Apex. Why all the rust around the spark plugs/ coils? What is this from? Note the coils where fully seated down on the motor, with the bolt holding them in. The 3rd picture shows the same coil as picture 1 , but it is cleaned up. I am replacing it due to ripping the rubber boot/ destroying the top of it trying to get it out of the motor.