2010 FZ1 spark plugs appear to have oil on them

[silentcropduster]

17k miles, just changed out plugs (yes I know way late).

Plugs don't smell like gas, def smells like oil, all 4 look the same. Bike runs very strong. Oil used is mobile 1 T4 10w40 and was done about 2k miles ago. I do a lot of spirited riding but don't abuse the bike, it has seen about 20 trips down the 1/4 drag this year.

Not sure if sig shows up thru tapatalk app but: Ivans ECU, PCIII, catless headers, air box mod.

Thoughts?

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[delbert]

Difficult to say exactly, but the oil around the threads would be consistent with a leaking rocker /valve cover gasket, oil would leak down the threads as you removed plugs , any smoke on start up after plug change ?