Heres a better comparison of Japan & Chinese than what I did earlier..
My friend happens to own a United Motors 250cc Motor cycle.It has a Vtwin engine with 5 speed trans. Its like prodigit says. The gearing is off, the powerband is depressing (very flat) and the bike is HEAVY for what it is. 450lbs @ 27hp .It is also AIR cooled.
Now a Ninja 300 is a nice bike according to the specs. Its watercooled, 6 speed trans, under 400lbs and I believe its close to 40hp if I remeber right.
Just throwing that out there. I like threads like these