2 Broken spark plug anodes?
I went out this morning and within ten minutes my 260 started running bad. I pulled spark plugs and I had two NGK BPZ8HS 10 plugs and it appears that the anodes broke off in the same place on both plugs. Just destroyed two pistons. This is 2 260s in two years! Any ideas? it does not look like detonation as the piston tops are still a bit wet and no damage on the tops of the piston. You can just see where the anodes beat the pistons up. They broke off about half way in the middle of the anode.
Carter Powell