Need some spark plug advice

[91trunk-edtootall]

I've got a 2008 CJ (pretty much the GT-500 drivetrain with a TVS) I just swapped out my plugs TR7's and the electrode has some yellow it. This happened only on one bank of cylinders. The other side was fine. The car has sat for a couple months, with being started and moved a couple times. I was told it might be too hot of a plug and to go cooler?

Advice would be helpful. Trying to get back out one last time this year, so the sooner the better.

 

[US-1]

What fuel are you running?

 

[91trunk-edtootall]

C16

 

[router]

Go with the NGK plug is is a colder plug. Runs great on my 726 RWHP so far

 

[US-1]

What I can't figure is that it is only doing that on one side?!?!? I'd definitely try a colder plug. Might check with Brisk.

 

[lito]

Maybe a too crazy idea but had you had to replenish your IC reservoir?

 

[lito]

I know it sounded weird but I was referring if your IC core may be leaking coolant out of it, that is how the plug looks to me and goes with the fact that only one bank is getting it.