So i was riding my friends X7 pocket bike, and well.....its slow. i mean really really slow. It seems like it has been broken in but i can't tell for sure. It looks really new but he got it from some guy on Craigslist for 30 dollars because of a gas leak...What a deal! So i really am not sure what could be wrong we put a digital speedometer on it and it only read 7mph. Maybe it hasn't been broken in? what should i do to make it actually hit maybe 15mph or even 20! Would really appreciate some help. Thanks!