I can't get my YZ426 to kick over after a short ride this weekend. The bike stalled while turning around and I heard a weird click after this the bike won't kick for anything. The bike has been running great with no noises or problems. I just installed the AD hotcam about 5 riding hours ago. The bike had plenty of oil and was not running hot. I have removed the valve cover thinking that maybe the recent cam install had something to do with it. Everything looks normal. I drained the oil and did not see any metal shavings or anything weird. Could it be a bearing? Piston seized? What can I check before I take it in to the shop?