2003 Yz125

I didn't understand this at all....I had oil coming out of my spark plug but the plug was very very snugged...I usually hand tighten and then do a quarter turn...and have had 0 problems and have done it 100s of times...it's the first time it's ever happened and I wasn't even on the track running it hard...it did see more whinning out because I was on some strait aways though...anyone know why? I've cleaned it well and put a new plug in and didn't do it...so I figured it was the seal around the plug but it looks great (the metal ring) all the way around...

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