Driving in traffic with my 500 is Nirvana, with no clutch, excellent ABS brakes, a smooth engine that has tons of power, torque and acceleration. What could suck about that?
Leave the thing alone and enjoy. If you want something faster that is available in the US, get a T-max 500 or a Burgman 650. I've had 2 Cheeseburger 650's and a 2009 T-max 500 plus a lot of others and the Kymco 500 still puts a smile on my face because of it's effortless abilities and huge mid-range torque.
I can understand some of these folks on the little 'string trimmer' scooter's wanting some more get up and go:)
Sam:)