I went about 45-50mph on my 49cc scooter last night. I find that far more terrifying than higher speeds on motorcycles. Way I figure it the scooter (tires, frame, suspension, brakes) is designed to go 30, my CB500 is designed to go at least twice that!
The scooter is dead stock, I do not know why they made them capable of such speeds in something that is supposed to be what teenage girls commute to high school with. I weigh 250lbs. I wonder how fast it would go with the 125lb Japanese guy it was designed for riding it.