I have used both the NT and CNS. Both were fairly tempermental and neither performed very well, especially at high RPM. I just installed my Dax rt 15mm carb. I have heard that its a clone of a 15 mm Dellorto carb. Going to the Dellorto website pretty much confirms this. They look just alike. This carb came with a 75 main jet installed and a 70 and 80 in the box. A 60 mm very nice air filter was also included as well as a throttle cable. I used the cable that was included and was suprised to find all the slop that was present with both the NT and CNS was gone. The throttle was "right there" like your used to on a good motorcycle. Immediatelly it was obvious the motor was pulling WAY harder. I layed on the throttle and the bike rocketed up to 30 mph uphill! Im 305 LBS. Previously my bike would hit 18-20 mph up that hill. I went around the block laughing like a mad man. I have paid my dues on this bike my friends. I was almost in tears as i ripped past my house. It used to be that i had to keep the throttle pegged to stay at top speed. With this baby, i could hit top speed and then back off to half throttle with out slowing. The only neg i have with the whole thing was a 10 day lead time on shipping. Not that big a deal. I have a SBP expansion as my only performance upgrade. I will put up a few pics in a minute. PS: buy one. You want it.