I started with a CNS3, and after much heartbreak, I got an NT Speed and fell in love with it...until the banjo-bolted fuel-nipple began leaking. I couldn't get it to stop either; once those ring-washers get tightened, you can't re-tighten them properly to stop leakage. I tried EVERY OTHER type of washer too: rubber, vinyl, copper-crush...etc. I actually ended up buying a whole new Speed NT since it'd be cheaper than buying more washers! Well, THAT one eventually leaked too. I had a regular NT that I never unwrapped from a kit I'd purchased that I didn't need, but figured I'd give it a try. Well, I LOOOOOOVE it. No potentials for leaking like the Speed, super simple to tune (if you really need to...had to thicken it up by one notch on the needle this Winter once it started to go below freezing), and it's MUCH better on gas. I have a 29er with a 66cc. The combo gets my fat ass up to 25MPH no prob.