[dhoward]

Take that little carby apart and hit it with some carb cleaner. Make sure you get it into all of the passages. Check the needle seat. Sometimes they swell. Make sure the float moves freely.
Based on where the plug is in that head, it really looks like a 4 stroke....
Start 1 1/2 turns out on all of the screws.
After looking at it further, that REALLY looks like a 4 stroke. If the plug is dirty, but not wet, you're not getting fuel.