500 miles on failed rebuild. I'm a little concerned about how shiny the side electrode is. Should I be?

 

Idon't know. 500 miles? is that correct? I would not expect a plug to look bad after only 500 unless there were major issues with fuel/air or timing

 

I wasn't thinking so much that it looked bad, I was just surprised that the face of the side electrode is clean as a whistle. Could be normal for such low miles, I just don't know.

 

Looks very, very lean to me. How did the rebuild fail? Pistons gall?

 

Those spots of grey are piston coming off on it . It's hard to see in pick but in day light those could be confirmed as shiney aluminum spics on the ground strap in third pic

PS: get rid of the iridium's

 

Tea leaves again.
Why guess when you buy an AFR unit and read the ratio?

 

Those plugs were in my engine when the pistons went south so I'm hoping the debris is from that itteration. You're not the first one to diss the iridiums. What's your preference?

That is exactly right. And thanks for your observation about an apparent lean state. What made you conclude piston gall as previous failure mode?

I am with you, and an taking that advice. thanks for it.

 

Harley plugs the standard one work good. I actually have some double Platinum Harley plugs I found at a swap meet, found out they don't make them anymore. Think I have about twenty thousand on them and still look great, don't get rounded out like the standard plugs. I was wondering if champion has some DP in the same heat range. Think these will last till I hit 200, 000 on the bike, Lord willing the black bone braker will make it that long.