So, if this were a car, I would say that the timing is off.
New spark plug. Gas could be bad, it's left over from last summer (the can I use for the lawnmower). Cleaned up carb, even tuned it as best I could (it only has one spot to tune, right?).
The only thing I didn't pull from it when I pulled the carb apart was the float assymbly. That needle that it presses on moves freely as far as I could tell.
KLT200 4 stroke kawasaki.
thanks in advance