Howdy, 2 weeks ago I road my bike for several hours on the trails. After the ride, I parked it in the garage with the fuel off and didn't touch it until today. I went to start it and for 10 minutes of kicks, it never once gave any indication of a spark. I took the plug out and the end was coated in nice dark black oil (if it matters, I just replaced the oil prior to my ride 2 weeks ago, so the oil only has a few hours on it and maybe 10 miles in relatively dust free riding). I searched the forum for "oil fouled spark plug" and a few other variants and didn't find anything. I also checked the valve clearances and they are within specs. Any thoughts on what might be causing this?