Question about 2004 Yamaha FZ6 Fazer

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Oil on my sperk plug

As the topic says, found oil on my spark plug threads on the #1 and #2 cylinders. #1 was the worst, looks like it was all the way up the threads. The plugs themselves aren't fouled with oil and they have at least 3,000 miles on them. Is this something I should worry about? I just dropped in some new plugs so I guess I'll see how those are doing in the next hundred miles or so. My bike does have a habit of making oil disappear, but it's in small quantities at a time and I figured it was from my leaky valve cover gasket.

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If you have a valvecover leaking, it could well be leaking into the plug well, and that's where the oil on your plug threads is from.

Posted on Nov 10, 2008

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