yes, there is reason to modify it. Plug the limiter on the carb. Grind the sides off the the piston beneath the piston port windows so its flat. And enlarge the piston port windows downward. Make all of the intake block / gaskets / heat shield all match the cylinder intake. Hack open the muffler and gut it....slap the hacked piece back on.....make the muffler flange and muffler gasket match the cylinder exhaust port. Runs way better after all of that....runs like a 90cc saw should. Also can slap a 3/8 bar and chain on there since most come with 404