I think the same amount of notches, one is about an 1/8" longer. Like Jag said, these engines are rich from the factory. By dropping the needle I was able to get a smoother engine at mid speeds. But frankly, I just bought a "Dollorto Type" carb on ebay. Although I've not dialed it in completely the top end is much better than I was able to get out of the NT Speed Carb. Mid range is smoother as well.