Myself I can tune any engine in my sleep....so finding the sweet spot for me in no issue on any brand...However I do find that each engine has varying degrees of sweet spot...some engines are capable of hitting a sweeter tune then others........ I find OS super easy to tune, however i find their sweet spot is nowhere near as sweet as a Picco's sweet spot or a B5's sweet spot.....To me the OS have a very obtuse sweet spot, its easy to get into the good running range, but impossible to get as crisp and responsive as the other 2 engines I mentioned.....Which is why I prefer Picco over OS for my own personal engines...