It's total anti-humour, which accurately portrays what's wrong with 'ragecomics' nowadays. I believe that it was made unfunny on purpose, and making others laugh was not the intention of the author.
Haha! It has a 49cc 2-stroke air-cooled engine. With a proper exhaust and a 14/12mm carb it'll do 60km/h. However, this type of moped has a registered top speed of 25km/h, which comes with the advantage of me not having to wear a helmet. If the police would catch me doing 60km/h, I'd lose my driving and riding licences, my moped and hundreds of euros. I'd better keep it close to stock.