It's not cheaper after you pay someone to mod it!:biggrinbounce2:
or
It's not cheaper if you mess up the cylinder while modding it ($300):hmm3grin2orange:
Polishing alone? na... with careful port, piston, carb, ignition timing, air filter mods and muffler work.. sure
So... yes... you can get that type of power (not the same power band though) BUT, it won't last. You have smaller areas (cylinder fins etc) for cooling, weaker cranks, wimpy flywheels (in comparison), weaker clutch, etc etc...
Reasonable limits need to be applied to over stressing a design that was cost reduced in the first place...
Stihl had problems in the early day of the 440 by scaling it up from the 036 design, and ended up with a redesigned crank. Ditto on the 064/066.
If you don't care, and want a hot rod for a few hundred hours of life, then that fine. Of course if you snap the crank in the first hour...
"There is NO replacement for displacement" - who said that recently:hmm3grin2orange: