spark plugs soaked in oil

[gixxer600w]

hi everyone, just changed air filter and pollen filter then spark plugs, but when i took 2 of the spark plugs out they were covered in oil, the car isnt using any oil, anyone know why they would have oil on them?, the other 2 spark plugs were fine

 

[MicKPM]

It is fairly common and will be as a result of the upper cam covers leaking at the seal.

Mick

 

[D1CKY]

It is fairly common and will be as a result of the upper cam covers leaking at the seal.

Mick

Will that cover the plugs in oil ?
I thought it would just fill the plug well

 

[MicKPM]

Did you check the spark plug wells before you pulled the plugs? I bet they had oil in them and when you pull the plugs the thread and electrodes get covered as the oil tries to flow down in to the bore.