Don't rely on the flywheel timing marks. remove the spark plug and insert a straw or Popsicle stick in the hole to get the piston to TDC (top dead center). You can mark/verify your TDC on the flywheel and then make sure the two small holes in the cam line up with the top edge of the head. If these are lined up, your valves are timed properly.
To adjust the valve clearance (lash), the piston must be at its compression stroke. This determined by the cam since the cam only turns half as fast as the engine. if you see a big hole in the cam sprocket pointing toward your seat, your seat you are your compression and can adjust lash. if you do not see it, rotate the crank 360 degrees to get it off the exhaust stroke.
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