Change ALL the fluids. Any and all fuilds. It is very common to find extremely fine and small peices of metal in the fluid on your first change. Just left over crap from the machine shop building the stuff. Change/clean ALL filters. Look at your spark plug, what color is it? If the machine is fuel injected, I wouldn't worry about the plug. Although it wouldn't hurt. This will tell you how your air/fuel ratio is. Check valves, check all of your bolts. It is possible they worked loose. Just make sure stuff is snug.