Originally Posted by John Robertson
Yes i have a stock NT on mine. I have the same 4 stroking problem but eventually i will go to a reed valve and a different carb I have been ordering my parts piece by piece
My suggestion is don't waiste your money on the reed valve stuff, just tune the carb to run correctly as Tom has given advise on in his post and you will have a nice running engine if your ports are deburred and matched up pretty good and the engine doesn't have really crazy bad upper rpm vibes from a badly balanced crank, a free flowing exhaust is a must of these china girl engines for top performance also, a stock unmodified pipe is a performance killerrrrrr.... on these engines.
The RT carb from thatsdax is also a good option that wont do better on the top end than the NT in my experience but will offer better low to mid throttle response and is also easy to tune by just changing main jet size.