G'day Kori, On its own not much but clean the ports up and such and it sure does...The deference really shows up when I go from using a stock (boring) Victa to one Ive done mods to.. Definately have way more torque and hold revs up in the tough going but as far as max rev's go they are the same I keep the governor as is....But then I work some of my mowers hard and can smoke a set of blades in say 2 tanks of fuel lol.....