I worked for a chain saw Mfg for 10 years (Homelite).. we made different size saws cause.... ????? they were needed!!.. you can only trick up an engine so much. In the end... you run out of potential energy per volume of displacment.. everything else being equal.. Now if u were to Super charge.. then that changes things... but only for a Supercharged vs non supercharged.. BobH.