It turns a 13x6 at 12,100, 13x8 at 10,400, a 14x6 at 10,800 and a 16x6 at 8,100, user friendly, strong running and smooth. The muffler is way loud at 102.5 db is the way the tester put it. The remote NV allows the fuel to either run back into tank or into the carb when it is stopped. They eliminated this tendency by moving the NV to the carb, this also made it easier to start.