As i was cruising along a gravel road at half throttle on 4th gear my bike sputtered and stalled. It still kicks over but there are two head bolts that missing. Actually one was broken off. There is black gunk/grease around the spark plug on top of the head and some antifreeze on the head. Does this sound like a big project? I am an amatuer with the wrenches. Would I be better off taking it in to a pro? any help advice would be appreciated.