Re: NT Carb?
The carb from BGF on ebay is a nt, I bought one to have as a spare. Myself and many others here have had good results with the cns after we found what our bike,engine combo needs. My setup is differant from most because its on a 48cc, didn't need to drill the main jet just removed the vent tube and replace the plastic spacer. If you do a side by side comparison the nt is much smaller and can not flow as much air as the cns. Since these engines run an air to fuel ratio at around 14 to 1 air flow is the key.
Your results may not be the same,Greg