I have done it as well! burnt mine a little worse (porcelin was even gone). thats what happens when you get in a hurry and forget to back the timing off when running nitrous. I think I only had like 3 good plugs left.....and I could def. tell something was wrong(I thought I blew it up). changed the plugs and right back in business. torn the motor down 2 years later and the evidence is def. there!