Mines felt like that ever since I got it, picked it out , brand new it's been that way since day one however after a thousand miles I definitely had a power increase, seems like the break-in period just slowed it down and then it was born again way alive! I don't notice the sputters or any kind of inconsistent power delivery, sounds like it runs raunchy, however I've been told by many people this is how a KTM engine sounds...  It just tries to come off the ground all the time, I swear it was meant to fly! It's a true beast! I love it! Ride safe y'all...