You know how in "Mario Kart," the higher-difficulty ... than a beefy cruiser with the same engine, for instance. On average, though, 250cc bikes can go a top speed of approximately 85 to 90 ...

A small go-kart with a 10-horsepower lawn mower engine is plenty of fun. Professional racing karts with 250cc engines make around 50 ponies and can top 100 mph in just a few seconds. This ...