03 WR450... Went riding today... everything was running great until we stopped a few times. I kick started everytime vs. using the magic button. But after the 3rd stop my bike wouldn't start. Plenty of fuel. Just changed the oil last ride (But checked anyways). Bike has plenty of compression, just wouldn't kick over. Also when we removed the oil fill plug smoke came out. Not like billowing out, almost like cigarette smoke or steam... Had to push start the bike to get home. The bike was tapping (probably the valves) when i first left the house but i figured id get another ride or two before getting it checked. Any ideas????