Nothing has really gone wrong with it. It doesn't get beyond 55-60mph, and so I will not take it on the highway for that reason alone, beside the fact that it's light and gets too blown around for safe driving on a highway.
It really loses speed going up hill. I got it used to learn on, so in the beginning this was not a problem. Now that I'm commuting with it, the lack of speed is beginning to become an issue for me.
There is a slight connection problem with the rear turn signals. This is but a mere inconvenience, and hopefully this connection gel I bought will solve the problem.
The pegs feel a little too narrow for my feet, so that can be uncomfortable by the end of the commute (30 miles each way).
These are all fairly minor. The carburetor may need to be adjusted to help with the speed. I will look to see if I can figure out how to do this.
This is an excellent around town bike or off-highway bike, and is easy to learn on.
Handles very easily and is reliable.
I get about 60-65 mpg consistently on the bike.
Too light and slow for the highway for me to feel safe.
I've gotten it up to at least 70 MPH. It definitely does lose power on hills though.